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NPD-4

Troubleshooting — RF

CCS Technical Documentation

Page 38

 

Nokia Corporation       Confidential

Issue 1 02/2003

Table 11: RF probing for Cell CDMA and PCS back end receiver

Probing point

Probing 

location on 

board

Probed absolute 

power (dBm) or gain/

loss (dB)

Where to start checking if RF 

power not correct (soldering, 

shorts, DC power applied if 

active, correct voltage of DC 

signals, otherwise replace)

Alfred (N750) 
mixer out= CDMA 
RX IF saw (Z753) 
in

46, Figure 6

This point not 50 
ohms. Will
measure approx -14 
dBm for -52 dBm 
input and RX  AGC 
PDM=225.

N750 and supporting components 
(Also ensure BAND_SEL low for 
Cell CDMA and high for PCS as in 
Table 9. Also IF_SEL low for CDMA 
as in Table 9), L754, C782, C767, 
C761, C786, Z753

CDMA RX IF saw 
(Z753) out= Bat-
man (N701) in

47, Figure 6

This point not 50 
ohms. Will
measure approx 
-47 dBm for -52 dBm 
input and RX AGC 
PDM=225

Z753, N750 and supporting com-
ponents (including check for proper 
voltages on Alfred signaling as in 
Table 8), L754, C782, C767, L759, 
C770, C771, C772, L760, L761, 
N701

Batman (N701) 
out= UEM (D200) 
in

40, Figure 6

Easiest to use RSSI, 
see Table 6.

N701 (VR5, VR7, VIO, ensure 1.35v 
on VREFRF01 as in Table 9, also 
check RX_IF_AGC as in Table 9), 
R705, C704, R706, C706, C701, 
C714, R703, R702, C715, R704, 
V701, C716, L701, C702

VHF LO at 256.2 
MHz

39, Figure 6

N701, C701, C714, R703, R702, 
C715, R704, V701, C716, L701, 
C702, R705, C706

Summary of Contents for NPD-4 Series

Page 1: ...CCS Technical Documentation NPD 4 Series Transceivers Issue 1 02 2003 Confidential Nokia Corporation Troubleshooting RF ...

Page 2: ...NPD 4 Troubleshooting RF CCS Technical Documentation Page 2 Nokia Corporation Confidential Issue 1 02 2003 ...

Page 3: ...in Comp Cell or PCS Po MD or LO LM ML MH HM or HI 20 TN G_Offset Cell MD 21 TN AMPS PL2 Po Mid or Low LowMid MidLow MidHigh HighMid or High 21 TN AMPS PL3 or 4 5 6 or 7 Po 22 TN PA Gain Cal PCS Po 0 or 1 2 3 4 or 5 22 TN TX IF 11 dBm Set PCS Po 22 TN TX RF AGC PCS Po 0 or 1 or 2 22 TN TX Limiting Po Cell or PCS IS95 Low channel or LowMid MidLow Mid MidHigh HighMid or High channel 23 TN TX Limiting...

Page 4: ...GC PDM values from the phone 48 To load a PRL into the phone 49 To change between Local and Normal modes 49 To add a baseband test tone to the AMPS transmitter 50 APPENDIX B Definitions 51 APPENDIX C Block Diagrams 52 APPENDIX D Descriptions of selected components signaling and architecture 57 Robin N601 Key Features 57 Robin N601 Signaling 57 Batman N701 Key Features 58 Batman N701 Signaling 59 P...

Page 5: ...nd 3 and ensure that AGC voltages are correct according to Tables 2 cell AMPS and 4 PCS check the LOs for proper frequency and amplitude ensure power supplies to transmitter have correct voltage as per Table 12 If Receiver is not working properly turn on transmitter in local mode and check turn on receiver with Phoenix inject a signal into the receiver check the RSSI level and AGC PDM according to...

Page 6: ...all zeros in tuning file and has passed tuning ensure call box channel is set for a channel in PRL and ensure SID is correct ensure MIN MDN and SID are entered into the phone ensure VCTCXO is centered as described in VCTCXO tuning descrip tion below ensure transmitter and receiver are working properly by checking them in local mode To troubleshoot the antenna circuits refer to document DHK00086 EN...

Page 7: ...ent LNA DWN CVTR PCS RX SAW Filter Cell RX SAW Filter PCS Duplexer Cell PCS Diplexer Cell Duplexer PCS Isolator Cell Isolator PCS PA Cell PA Cell Driver PCS TX SAW Filter Cell TX SAW Filter GPS RF Conn Ceramic GPS Filter AMPS IF Filter UPP DC to DC Converter TX IC FLASH Memory PCS Driver UHF VCO PLL IC RX IC VCTCXO UEM CDMA IF Filter System Conn Power Switch ...

Page 8: ... Batman IC The phone checks the VHFPLL s lock detect bit If this bit indicates that the PLL is unlocked the test will fail Manual Verification Turn on the Cell or PCS receiver to any channel and probe at L701 probing point 39 in Figure 6 using an RF probe connected to a spectrum analyzer tuned to 256 2 MHz If the PLL is locked it will be stable in frequency If it is unlocked you may have to use a ...

Page 9: ...PDM window set TX_IF_AGC to 100 TX_RF_AGC to 512 PA_AGC to 511 Record the TX signal power from the antenna connector using a spectrum analyzer cen tered at 836 52 MHz The selftest measures the power detector reading instead but at the present time this cannot be done with Phoenix therefore an easy way to check functionality without removing the covers is to check transmitted power If the covers ar...

Page 10: ...ce it may be far off frequency Troubleshooting First check that V601 and V602 have the proper orientation then check C612 C613 R607 R605 C632 R606 C638 L611 C631 C630 C629 C637 R609 C618 and R613 Check power supplies to N601 Robin and ensure there is 2 7v on VR3 and VR6 and 1 8v on VIO Table 12 and Figure 9 If no problems are found replace Robin ST TX Detector PCS This is one of the phone s self t...

Page 11: ...R801 R803 L801 and N806 and also Robin If the voltages are correct and it still fails check the UEM D200 ST Robin VHF PLL PCS This is one of the phone s self tests which gives either a pass or fail result only The VHFPLL is inside the Robin IC The phone checks the VHFPLL s lock detect bit If this bit indicates that the PLL is unlocked the test will fail Manual Verification Turn on the PCS CDMA Rx ...

Page 12: ...gs which tunes the lowpass filter in the Batman IC N701 in cell CDMA mode This self tuning returns one of the filters tuned parameters which should be within the limits Manual Verification Use RF Tuning window in Phoenix set mode to self tune and choose this tuning Troubleshooting Check Batman N701 and supporting components SN Cell RX DC Offset I or Q This is one of the phone s self tunings which ...

Page 13: ...phone caused by a solder bridge a failed component that is internally shorted a component placed with the wrong rotation which shorts two nodes that shouldn t be or some other rea son Short circuits can be difficult to find but one of the easiest methods is to use a thermal camera and look for hot spots that are not normally hot and look for the hottest spots A visual inspection can find solder br...

Page 14: ...ve a higher amplitude than the carrier The values you enter in the values edit box are the AFC val ues which control the VCTCXO frequency Start with a value of 0 then adjust until it is centered staying within the limits Troubleshooting 1 If there is no tone probe pin 3 of G501 for a tone at 19 2 MHz If this is not present check power supplies particularly ensure 2 7v on VCTCXO Vcc pin pin 4 of G5...

Page 15: ...e 150 then cen ter the tone TN TX DC Offset Reference Power The DC offset voltages on the I and Q inputs to the modulator are adjusted for minimal carrier feedthrough maximum carrier suppression Initially the DC offsets are set to a nominal value and the power of a tone offset in frequency 20 kHz from the carrier is measured in dBm and recorded as a reference in this tuning Then in the next tuning...

Page 16: ... 836 52 MHz The result is a delta in dB between the reference at 836 52 MHz 20 kHz and the mini mum carrier level at 836 52 MHz found by adjusting the DC offsets for I and Q individu ally The delta should be at least 35 dB Manual Verification Set up the phone as in the previous test and record the reference power of the offset tone Measure the delta between the center and offset tones If the delta...

Page 17: ...anual Verification Set the phone in local mode then program it to Cell CDMA RX TX mode on channel 384 Set modulation to IS95 voice Set the Cell PA PDM to 218 decimal and the TX RF AGC to 512 decimal using the slid ers in the PDM window under the RF menu Change the TX_IF_AGC to the settings in the following table and measure the TX power levels checking to see that they are within the specified ran...

Page 18: ...for each These values are reported in this tuning The soft ware then performs curve fitting to interpolate between the measured data points The result is the transmitted power in dBm for each of the six PA AGC PDM settings results labeled 0 through 5 Manual Verification Turn on the cell CDMA transmitter in Phoenix using the RF Main Mode window and set it to channel 384 Set modulation to IS95 voice...

Page 19: ...nt to ground because this will instantly destroy the PA Visually check soldering first and probe on PA output as a last resort TX TX IF 11 dBm Set CELL Po See previous tuning This is the part of the previous tuning when the TX IF AGC is adjusted so that the output power is 11 dBm The result is a power in dBm A perfect result would be 11 00 dBm Manual Verification See previous tuning Troubleshootin...

Page 20: ...ing The output power in dBm is recorded in this tuning After this is done on the midchannel the chan nel is changed to each of the other channels and output power is reported G_offset is not adjusted on the other channels as it was on the center channel just the output power is recorded The result is the transmitted power in dBm which should be 8 0 dBm 0 5 dB on the center channel Manual Verificat...

Page 21: ...even channels by adjusting TxdBCtr The channels are Low 991 LowMid 107 MidLow 245 Mid 384 MidHigh 521 HighMid 660 High 799 The algorithm then interpolates between the measured points for frequency compensation The result is measured transmit power in dBm for power level 0 on each of the seven channels Manual Verification Set the phone to local mode and turn on the AMPS transmitter to the channel t...

Page 22: ...ansmitted power in dBm for each of the six PA AGC PDM settings results labeled 0 through 5 Manual Verification This is the same as described in TN PA Gain Cal Cell Po 0 except the phone is set to transmit in PCS mode on channel 600 The transmit frequency is 1880 MHz Troubleshooting Troubleshoot in the same manner as described in TN PA Gain Cal Cell Po 0 for cell band using the PCS band tables in t...

Page 23: ...on Using Phoenix set the phone to local mode then turn on the Cell or PCS transmitter set to each of the channels in the list below Using the RF Tuning window adjust TxdBCtr in the values dialog box until the TX power measured on the RF connector with a spectrum analyzer is within the limits on each of the following channels Troubleshooting If the maximum cannot be reached either a component in th...

Page 24: ...d at the offsets is 30 kHz Result is ACPR a power delta in dB Manual Verification Set the phone in local mode and turn on the PCS transmitter set to channel 600 Use the TX Limiting function in the RF Tuning window to set the transmit power to the maximum value within the limits for the TX Limiting tuning Observe the TX signal on the spectrum analyzer If the spectrum analyzer being used has a CDMA ...

Page 25: ...C635 C608 C650 C817 C808 C814 C809 C813 Severely degraded ACPR is detectable just by looking at the shape of the CDMA curve see figure above therefore you can also probe each point in the TX chain to see if ACPR becomes degraded at one point TN PA Detector PCS Po 0 or 1 2 3 4 5 6 or 7 This tuning determines the output voltage of the TX power detector as a function of transmitted RF power The resul...

Page 26: ...ing Tables and Diagrams sec tion Cell band TX decoupling capacitors are C653 C633 C649 C648 C619 C817 C810 and C811 TN RX IF AGC RXdBCtr 0 or 1 or 2 This tuning calibrates the RX IF AGC curve since the output power of the IF part of the Batman IC is not a linear function of RX_IF_AGC The tuner injects three known signal power levels into the phone s receiver and for each one the phone s AGC algori...

Page 27: ...his tuning records RxdBCtr which is automatically adjusted to produce the same ampli tude on the receiver output no matter what the input is for the receiver with the LNA in highgain mode and again with the LNA in lowgain mode For AMPS this is done only on the center channel but for Cell and PCS it is done over several channels The result is a value of RxdBCtr Manual Verification Using Phoenix cho...

Page 28: ...binations of AGC values it is generally only necessary to check one combination The extra information is provided in case it may be useful in an unexpected situation Likewise although probing points and signal level information are given for each point in the receiver and transmitter chains the troubleshooter is not expected to probe each point on every phone only the suspected trouble spots Absol...

Page 29: ...ower on RF con nector PDM value voltage PDM value voltage PDM value voltage typical v typical v dBm typical v dBm 409 0 17 110 0 68 11 2 3 dB 19 0 84 26 5 PLO 409 0 17 92 0 71 13 2 3 dB 123 0 66 25 0 PL3 409 0 17 76 0 74 15 4 3 dB 310 0 34 21 0 PL4 249 0 44 66 0 77 19 4 3 dB 330 0 30 17 0 PL5 104 0 70 56 0 78 22 4 3 dB 330 0 30 13 5 PL6 37 0 95 48 0 79 27 9 3 dB 330 0 30 9 0 PL7 CELL CDMA 403 0 17...

Page 30: ... 6v Vbat on pin 5 and 2 6v on pin 4 Tomcat N603 out TX SAW filter Z604 in 4 Figure 5 Gain 12 16 dB through Tomcat N603 also ensure 3 6v on pin 5 and PD_CELL high as in Table 2 N601 C649 C639 Z604 N801 Vbat TX SAW filter Z604 out cell PA N801 in 5 Figure 5 Loss 2 3 dB through SAW Z604 N603 N801 Vbat Cell PA N801 out cell isolator Z802 in 6 Figure 5 Probing here not recom mended unless necessary bes...

Page 31: ...l 11a Figure 5 you can touch top of plastic to verify pres ence of LO but this won t measure amplitude accurately N601 C612 C613 R607 R605 C632 R606 C618 R609 C629 V602 C637 V601 C630 C631 L611 C638 R604 R601 R602 R613 Table 3 DC probing for Cell AMPS transmitter Item to check Setting DC probing location on board DC Voltage Items to check if voltage incorrect TX RF AGC See Table 1 12 Figure 8 See ...

Page 32: ...ure 5 See Table 1 T603 L609 L610 C624 C647 L666 C646 L667 C660 N602 including check for 3 6v on pins 7 and 9 D400 Hornet N602 out PCS TX SAW filter Z601 in 18a for chan nels 25 599 18b for chan nels 600 1175 both Figure 5 Gain 14 5 17 5 dB through Hornet N602 including ensure 3 6v on pins 7 and 9 ensure PD_PCS high as in Table 5 and check PCS_CTRL as in Table 5 according to the channel used Z601 C...

Page 33: ...8 1 MHz for PCS on channel 600 10E Figure 5 Can probe on top of plastic to check for presence of LO but won t read accurate power Approx 3 dBm Check to see if LO is present If no LO is present check R515 C511 C501 C532 Make sure there is 2 7V at TP 10B If voltage is less than 2 6V then refer to baseband regulator troubleshooting If volt age is 2 7V check G502 at TP 10A with a FET probe Check that ...

Page 34: ...D400 UPP R430 C424 R431 C425 C431 V422 Filter select 1 Low for ch 25 599 high for ch 600 1175 30a Figure 5 Low 0v High 2 5v min N601 N605 C650 Filter select 2 High for ch 25 599 low for ch 600 1175 30b Figure 5 Low 0v high 2 5v min N601 N605 C608 PCS_ CTRL Low ch 600 1175 high ch 25 599 52 Figure 5 Low 0v high 1 9v min N601 N602 pin1 PD_PCS High TX on Low TX off 53 Figure 5 High 2 6v min low 0v N6...

Page 35: ... 9 Also IF_SEL low for CDMA and high for AMPS as in Table 9 Ensure GAIN_CTL is high if RX power is below the LNA switch point Z751 C755 L752 C757 R764 C753 R768 C756 Cell RX saw Z751 out Alfred N750 mixer in 34 Figure 7 Loss 1 3 dB through SAW filter Z751 N750 R765 C750 R768 C756 L757 C758 UHF LO at 1009 62 MHz in Cell CDMA AMPS for channel 384 10D Figure 7 Can probe on top of plastic to check for...

Page 36: ...46 dBm for 52 dBm input and RX AGC PDM 225 Z752 L765 C777 L766 C778 L768 L767 C779 N701 VR5 VR7 VIO Batman N701 out UEM D200 in 40 Figure 6 See Table 6 RSSI most useful N701 VR5 VR7 VIO ensure 1 35v on VREFRF01 as in Table 9 also check RX_IF_AGC as in Table 9 R706 C704 R705 R704 V701 C716 L701 C702 C715 R702 C714 R703 C701 VHF LO at 256 2 MHz 39 Figure 6 N701 C701 C714 R703 R702 C715 R704 V701 C71...

Page 37: ...igh gain Loss 3 to 5 dB for low gain use AGC status win dow to monitor gain status N750 and supporting components Also ensure BAND_SEL high as in Table 9 Also IF_SEL low for CDMA as in Table 9 Ensure GAIN_CTL high if RX power is below the LNA switch point Z750 PCS RX saw Z750 out Alfred N750 mixer in 44 Figure 7 Loss 1 4 dB Z750 N750 and supporting com ponents including check for proper voltages o...

Page 38: ... Also ensure BAND_SEL low for Cell CDMA and high for PCS as in Table 9 Also IF_SEL low for CDMA as in Table 9 L754 C782 C767 C761 C786 Z753 CDMA RX IF saw Z753 out Bat man N701 in 47 Figure 6 This point not 50 ohms Will measure approx 47 dBm for 52 dBm input and RX AGC PDM 225 Z753 N750 and supporting com ponents including check for proper voltages on Alfred signaling as in Table 8 L754 C782 C767 ...

Page 39: ...components Probing location VR1A 4 75 VCTCXO UHF PLL Charge Pump figure 9 VR1B 4 75 Robin Not accessible VR2 2 78 Robin Power Detector figure 9 VR3 2 78 Robin VCTCXO figure 9 VR4 2 78 UHF PLL figure 9 VR5 2 78 Batman figure 9 VR6 2 78 UHF LO Buffer figure 9 VR7 2 78 Batman figure 9 VIO 1 8 Robin UHF PLL figure 9 VRX 2 78 Alfred figure 9 VPLL 2 78 UHF PLL figure 9 VBAT 3 1 4 2 PA figure 9 ...

Page 40: ...chnical Documentation Page 40 Nokia Corporation Confidential Issue 1 02 2003 Probing Diagrams Figure 5 Probing diagram TX components E 11A 11B D 10E 7 6 5 19B 19A 4 pin6 3 16A 16B 17 2A 2B 18B 18A 22 21 20 32 49 50 30A 30B 52 pin1 53 ...

Page 41: ... Technical Documentation Troubleshooting RF NPD 4 Issue 1 02 2003 Nokia Corporation Confidential Page 41 Figure 6 Probing diagram RX IF components C A 10C B 39 10A F 10B 46 10 57 40 60 47 check both 37 36 ...

Page 42: ...NPD 4 Troubleshooting RF CCS Technical Documentation Page 42 Nokia Corporation Confidential Issue 1 02 2003 Figure 7 Probing diagram RX LNA components Figure 8 Probing diagram BB area 12 14 13 ...

Page 43: ...CCS Technical Documentation Troubleshooting RF NPD 4 Issue 1 02 2003 Nokia Corporation Confidential Page 43 Figure 9 Cellular Engine Diagram ...

Page 44: ...ssue 1 02 2003 Figure 10 Probing diagram power detector APPENDIX A Phoenix Instructions To turn on the PCS or Cell CDMA transmitter Under the RF menu choose main mode which opens the dialog box shown below To turn on the transmitter first turn on the carrier by highlighting RX TX in the sub 48 ...

Page 45: ...field and click Rho ON in the state field Choose Cell or PCS in the band field Under Radio Configuration choose the desired con figuration C2K is an abbreviation for IS2000 Click Execute button To turn on the AMPS transmitter Eventually the method will be to use the RF Main Mode dialog box as shown above choosing AMPS in the Band field However at the moment there is a software prob lem with this m...

Page 46: ... The address will then be displayed in the field in the lower half of the dialog box Use this method to enter in both the AFC Disable and AGC Disable addresses These addresses can be obtained from R D and they can change with software version This is the reason this method is temporary Once both addresses are entered check Periodic Read On then click Stop button Then click the Read button which wi...

Page 47: ...ime in seconds in the delay box This is the delay between applications of the multiple values entered Three seconds is sufficient for all tests to run however in certain cases you may want to increase the delay in order to closely observe the phone s behavior during the tuning Any data returned from the phone is displayed on the status line the box at the bottom which in the figure below says 8 tu...

Page 48: ...you must first load the template file by clicking Load File but ton under the Parameter File field Ensure that the template file used is appropriate for the software version in the phone To read RSSI and AGC PDM values from the phone Open the AGC Status dialog box which follows Click Enable Trace RSSI is the value near the antenna on the receiver side The AGC PDM values are shown beside their resp...

Page 49: ...list so that it is blue then click the Write PRL To Phone button At the bottom of the window a status message will indicate if the file was loaded correctly or not To change between Local and Normal modes To make a call the phone should be in normal mode In normal mode the phone soft ware is running and the phone will search for a pilot To troubleshoot so that you can manually control the phone no...

Page 50: ...ween normal and local modes use the Phone Control dialog box as shown below This setting will be lost if the phone is powered down To add a baseband test tone to the AMPS transmitter To add a baseband test tone to the AMPS transmitter open the Test Tone dialog box as shown below and set the parameters as desired ...

Page 51: ...wer1 power2 It is used to denote differences such as gain or loss Power1 and power2 are in linear units such as W or mW dBm A unit for an absolute power level Formula is 10log power in mW 1 mW LNA Low Noise Amplifier LO Local Oscillator This is a CW signal used to mix signals up or down to a different fre quency PA Power Amplifier PDM Pulse Density Modulation This is used for control signals The d...

Page 52: ...NPD 4 Troubleshooting RF CCS Technical Documentation Page 52 Nokia Corporation Confidential Issue 1 02 2003 APPENDIX C Block Diagrams Figure 11 Transmitter Block Diagram Figure 12 Receiver Block Diagram ...

Page 53: ...CCS Technical Documentation Troubleshooting RF NPD 4 Issue 1 02 2003 Nokia Corporation Confidential Page 53 Figure 13 Synthesizer Block Diagram ...

Page 54: ...22 07 MHz 30 kHz Step PCS 2058 10 2118 05 MHz 50 kHz Step TX Block RX Block TX VHF LO CELL 346 2 MHz PCS 416 2 MHz 0 90 2 1 TX Q TX I RX VHF LO CELL 256 2 MHz PCS 256 2 MHz 0 90 2 1 RX Q RX I TX IF CELL 173 6 MHz PCS 208 1 MHz RXIF CELL 128 1 MHz PCS 128 1 MHz 824 04 848 97 MHz 30 kHz Steps 1850 00 1909 95 MHz 50 kHz Steps PCS CELL 1930 00 1989 95 MHz 50 kHz Steps 869 04 893 97 MHz 30 kHz Steps PC...

Page 55: ...ut RBIAS PLL Q input I input Reset RF_BUS_CLK RF_BUS_DATA RF_BUS_EN1X TX_PA_AGC 1 35V reference voltage RBIAS SSB MIXER TX_IF_AGC_REF MUX 2 gain control gain control 90 o 90 o charge pump phase detector loop divider reference divider VHF VCO REGISTER 5 REGISTER 4 REGISTER 3 REGISTER 2 REGISTER 1 REGISTER 0 SIO interface BIASING BIAS CONTROL TEST MUX 90 o 90 o TEST1 TEST2 FILSEL2 PCSCTRL DEAF_CH_EN...

Page 56: ...NPD 4 Troubleshooting RF CCS Technical Documentation Page 56 Nokia Corporation Confidential Issue 1 02 2003 Figure 17 Detailed Batman Block Diagram ...

Page 57: ...r PA gain control contains op amp as part of power detection circuit has serial interface for control by external digital controller 2 7v and 4 7v for analog functions 1 8v for digital functions Robin N601 Signaling PCS_CTRL 1 channels 25 599 0 channels 600 1175 Output of Robin to Hornet PD_Cell PD_PCS Robin output to Tomcat and Hornet powers down those chips 0 off 1 on FALSE_DET Used by UEM to mo...

Page 58: ...ed line The higher the PDM value the lower the gain TX RF AGC This is a PDM controlled line The higher the PDM value the lower the gain PA AGC This is a PDM controlled line The higher the PDM value the higher the gain PCS TX Split Band Filter Z601 Due to the close separation between RX and TX bands in PCS compared to the width of the RX and TX bands a single filter in PCS is not available that giv...

Page 59: ...ore current in order to improve linearity which decreases Power Added Efficiency Boost Mode is used in CDMA both IS2000 and IS95 both Cell PCS above 21 dBm transmit power Biased directly from battery IREF input to PA from Robin that controls gain of PA LNA Downconverter N750 Key Features Alfred N750 Key Features Front end Receiver chip Contains PCS and Cell band fixed gain LNAs that can be switche...

Page 60: ...NPD 4 Troubleshooting RF CCS Technical Documentation Page 60 Nokia Corporation Confidential Issue 1 02 2003 APPENDIX E AGC Algorithms Figure 19 CDMA Cell and PCS AGC Algorithm ...

Page 61: ... 4 Issue 1 02 2003 Nokia Corporation Confidential Page 61 Figure 20 AMPS AGC Algorithm 0 10 20 30 40 50 60 70 80 90 10 0 30 20 TOTAL IF AGC PA AGC RF AGC 40 GAIN dB Output Power dBm dBm dBm AMPS AGC 20 30 10 3 4 5 6 7 2 24 12 16 8 AMPS PWR LEVEL LEVELS ...

Page 62: ...NPD 4 Troubleshooting RF CCS Technical Documentation Page 62 Nokia Corporation Confidential Issue 1 02 2003 ...

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