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3. Store the NV item such that: NV_CDMA_TX_LIM_VS_FREQ[i] = 12*(PowerRef - Power[i])
Note that the first index will correspond to the lowest frequency.
E. RX Linearity Calibration
- Purpose
This item contains the DVGA gain value that makes the RSSI of the DVGA equal to the corresponding
power levels at the antenna port, at ambient temperature, and reference frequency. This value is
represented by a 10-bit signed two’s complement number in 1/12 dB units. Once calibrated, our DVGA
gain value will have an ideal mapping of min RSSI to -512 and max RSSI to 511 (see Figure 7-3).
- Procedure Proposal
1. Set phone in WCDMA mode.
2. Set phone to a reference channel (a reference channel usually is in the middle of the band).
3. Set signal generator frequency to a reference channel plus an offset of 685 kHz.
4. Set to highest LNA gain state.
5. Set LNA offset 1,2 and 3 to zero.
6. Set input power to recommended value of -80 dBm, let’s call this value ‘rxInput’
7. Set VGA gain offset to 0.
8. Read RSSI.
9. vgaGainOffset = { RSSI - [-512 - (RxLinMinPwr - rxInput) * (1024/dynamicRange) ] }
10. Set VGA gain offset to vgaGainOffset
11. Read RSSI again and we should see a value of approximately -200.
NV_WCDMA_VGA_GAIN_OFFSET = vgaGainOffset
NOTE Assuming a dynamic range of 85.3 dB, RxLinMinPwr = -106 dBm, we have -200 = -512 - -(-106 -
(-80) ) * (1024/85.3).
7. CALIBRATION
- 182 -
Figure 7-3. DVGA gain value
Содержание U8210
Страница 22: ...3 TECHNICAL BRIEF 23 Figure 3 2 1 1 RTR6250 IC Functional Block Diagram ...
Страница 37: ...3 TECHNICAL BRIEF 38 Figure 3 5 12 1 Bluetooth system architecture ...
Страница 110: ...4 TROUBLE SHOOTING 111 USB_D USB_D USB_VBUS X100 48M 48MHz ...
Страница 115: ...4 TROUBLE SHOOTING 116 LCD Control data flow ...
Страница 117: ...4 TROUBLE SHOOTING 118 LCD Control data flow ...
Страница 122: ...4 TROUBLE SHOOTING 123 TR400 ...
Страница 124: ...4 TROUBLE SHOOTING 125 FLASH_ON from Main Bíd PM6650 CN1 Flash LED ...
Страница 127: ...4 TROUBLE SHOOTING 128 FB503 CN500 FB502 CN2 CN1 ...
Страница 129: ...4 TROUBLE SHOOTING 130 C627 Head_set Output Pin 4 5 C626 CN304 R624 ...
Страница 131: ...4 TROUBLE SHOOTING 132 R649 CN300 CN2 CN1 U605 C633 R648 C634 R622 R623 ...
Страница 133: ...4 TROUBLE SHOOTING 134 R649 CN300 CN2 CN1 U605 C633 R648 C634 R622 R623 ...
Страница 135: ...4 TROUBLE SHOOTING 136 C627 Head_set Output Pin 4 5 C626 CN304 R624 ...
Страница 137: ...4 TROUBLE SHOOTING 138 R649 CN300 CN2 CN1 U605 C633 R648 C634 R622 R623 ...
Страница 139: ...4 TROUBLE SHOOTING 140 C627 Head_set Output Pin 4 5 C626 CN304 R624 ...
Страница 141: ...4 TROUBLE SHOOTING 142 MIC Contact C404 C401 ...
Страница 143: ...4 TROUBLE SHOOTING 144 C115 Head_Phone Input Pin 2 3 C102 CN304 R624 ...
Страница 146: ...4 TROUBLE SHOOTING 147 Receptacle 4 6V 4 6V ...
Страница 151: ...5 BLOCK DIAGRAM 152 Top Side ...
Страница 152: ...5 BLOCK DIAGRAM 153 Bottom Side ...
Страница 154: ...6 DOWNLOAD 155 It is ready for downloading ...
Страница 160: ...6 DOWNLOAD 161 6 Click on Download to download ...
Страница 165: ...6 DOWNLOAD 166 Downloading the Module image Finally Download has been complete ...
Страница 168: ...6 DOWNLOAD 169 When you meet the NV Restore error Connect to the phone ...
Страница 170: ...6 DOWNLOAD 171 Select the proper file and click on Restore Reading the NV file and restore NV ...
Страница 200: ... 201 9 PCB LAYOUT ...
Страница 201: ... 202 9 PCB LAYOUT ...
Страница 202: ... 203 9 PCB LAYOUT U8210 KEYPAD SPEY0032001 1 1 TOP ...
Страница 203: ... 204 9 PCB LAYOUT ...
Страница 204: ... 205 9 PCB LAYOUT ...
Страница 206: ... 207 ...
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