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RF Front End

MC13192EVB Reference Manual, Rev. 1.2

Freescale Semiconductor

3-3

 

Figure 3-2. Receiver Performance Curves

Return loss without R109 and with L101 = 6.8 nH. Tuning is slightly on the low side on this particular 
PCB, but adequate. C102 provides better balance and added static protection. The inputs will stand the 
usual capacitive 150 pF discharge test, but it is more sensitive than the other pins. The balun also adds 
protection. Tuning can be verified by measuring return loss at C103. The test level should be -25 dBm or 
lower to avoid overload. 

3.4

Low Noise Amplifier (LNA)

An optional LNA is included on the EVB. The LNA schematic is shown in 

Figure 3-3

. An MBC13900 

transistor is employed, which ensures good gain and a low noise figure with low collector current.

Figure 3-3. LNA Schematic

A collector current of 3.5-4 mA has been chosen. This value ensures optimum noise performance at 2.4 
GHz and an associated gain of 12-14 dB. Design target is a gain of 10 dB. The input is optimized for the 
best noise figure and the optimum source impedance is approximately 36+j21 Ohm. L104 shifts the 50 

Q101

MB C13900

2

4

1,

3

C1 28

10pF

Inp ut, 50 Oh m

L104
5.6 nH

C132
100pF

L105

1.5 nH

R1 40

220R

Output, 50 Ohm

C1 05

1.0 pF

C1 15

10pF

R108
150R

R1 12

100K

3V0_LNA

R119

100K

Not Mounted

GPIO1

Содержание FREESCALE MC13192

Страница 1: ...Document Number MC13192EVBRM Rev 1 2 09 2006 MC13192 Evaluation Board Reference Manual...

Страница 2: ...for any particular purpose nor does Freescale Semiconductor assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability inclu...

Страница 3: ...Background Debug Module BDM Interface 2 4 2 6 Reset 2 4 2 7 Schematic and Bill of Materials BOM 2 5 Chapter 3 RF Front End 3 1 The Transmit TX Chain 3 2 3 2 Switch and Bandpass Filter 3 2 3 3 The Rece...

Страница 4: ...MC13192EVB Reference Manual Rev 1 2 ii Freescale Semiconductor Chapter 4 PCB and MC13192EVB Interfaces 4 1 USB Interface 4 1 4 2 RS 232 Interface 4 1...

Страница 5: ...to achieve wireless connectivity capability The MC13192 is compliant with the IEEE 802 15 4 and the ZigBee standards Organization This document is organized into 4 chapters Chapter 1 Safety Informati...

Страница 6: ...abbreviations used in this document ATD Analog To Digital BDM Background Debug Module CPU Central Processing Unit EEPROM Electrical Erasable Programmable Read Only Memory ESD Electro Static Discharge...

Страница 7: ...erence Manual Rev 1 2 Freescale Semiconductor v References The following sources were referenced to produce this book 1 MC13192 Data Sheet MC13192DS 2 MC9S08GT60 Data Sheet MC9S08GT60 3 MBC13900 Data...

Страница 8: ...MC13192EVB Reference Manual Rev 1 2 vi Freescale Semiconductor...

Страница 9: ...levision reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate t...

Страница 10: ...Safety Information MC13192EVB Reference Manual Rev 1 2 1 2 Freescale Semiconductor...

Страница 11: ...V supply is split into various blocks such as RF LNA BB and others with 0 ohm resistors This allows users to measure current consumption of the various MC13192EVB blocks 2 1 Microcontroller Unit This...

Страница 12: ...The port allocation of the general purpose I O and on chip peripheral functions on the EVB are listed in Table 2 1 Table 2 1 GPIO Port Allocation MCU Port Functionality Input Output PTA0 KBIP0 SCI1 RS...

Страница 13: ...rough the real time interrupt 2 4 Clock The MC9S08GT60 contains an internal clock generation ICG module An external square wave clock is fed from the MC13192 transceiver into the ICG module at the EXT...

Страница 14: ...erent memory data The BDM interface can also be used for traditional debugging Debugging is accomplished using the CodeWarrior IDE for HCS08 2 6 Reset RESET is a dedicated pin with a pull up device bu...

Страница 15: ...1 5nH L105 1 5nH IRQ 12 PTA0 KBIP0 35 PTA1 KBIP1 36 PTA2 KBIP2 37 PTA3 KBIP3 38 PTA4 KBIP4 39 PTA5 KBIP5 40 PTA6 KBIP6 41 PTA7 KBIP7 42 PTB0 AD0 25 PTB1 AD1 26 PTB2 AD2 27 PTB3 AD3 28 PTB4 AD4 29 PTB...

Страница 16: ...System Overview MC13192EVB Reference Manual Rev 1 2 2 6 Freescale Semiconductor Figure 2 2 Bill of Materials 1 of 2...

Страница 17: ...System Overview MC13192EVB Reference Manual Rev 1 2 Freescale Semiconductor 2 7 Figure 2 3 Bill of Materials 2 of 2...

Страница 18: ...System Overview MC13192EVB Reference Manual Rev 1 2 2 8 Freescale Semiconductor...

Страница 19: ...ing chip antennas An RX TX switch is included to allow for a single antenna solution This allows for the smallest design possible and the switch is usually cheaper than using two antennas The switch c...

Страница 20: ...fault is Switch On at all times Leaving out R111 and mounting a 0 Ohm resistor at R124 change the switch to GPIO1 The harmonic content from TX passes the FCC and ETSI requirements but performance can...

Страница 21: ...id overload 3 4 Low Noise Amplifier LNA An optional LNA is included on the EVB The LNA schematic is shown in Figure 3 3 An MBC13900 transistor is employed which ensures good gain and a low noise figur...

Страница 22: ...C103 and adding C128 This task requires a good soldering iron with a small tip a pair of tweezers and small diameter solder 0 4 to 0 5 mm A microscope or lighted magnifying glass may also be required...

Страница 23: ...1 2 Freescale Semiconductor 3 5 Figure 3 5 Factory Default Capacitor Installation LNA Disabled Figure 3 6 shows C128 and C134 installed to enable the LNA Figure 3 6 After Capacitor Modifications LNA...

Страница 24: ...the LNA is on at all times Switching the base feed to GPIO1 turns the LNA off in standby and sleep mode This is done by removing R112 and adding R119 Because the GPIO1 does not work properly in some t...

Страница 25: ...ng an NTC resistor as part of R108 this drift can be compensated for Adding R106 turns off the LNA in TX mode Switching the base feed to GPIO1 turns the LNA off in standby and sleep mode This is accom...

Страница 26: ...should be within 40 ppm of 16 MHz This applies for initial spread temperature drift and aging Crystal performance temperature drift and initial tolerance are the main contributors to this tolerance 3...

Страница 27: ...te decoupling Z102 can be replaced by a discrete balun but a discrete balun is sensitive to load impedance and PCB spread and it takes up more board space than the ceramic types As the total cost is o...

Страница 28: ...Curve Figure 3 11 Typical Radiation Patterns It is possible to evaluate other antenna designs by using the SMA connector EVK horisontal PCB radiation pattern 30 25 20 15 10 5 0 5 Vert polarisation dB...

Страница 29: ...ployed A 6 8 nH coil provides the best and most uniform sensitivity in this layout 3 9 2 TX Output Power A 7 5 nH coil would be optimum in this layout to provide high output power and flat frequency r...

Страница 30: ...3 12 Power Output and Harmonics Versus Power Setting Figure 3 13 Output Power Versus Power Setting EVB Power harmonics 70 60 50 40 30 20 10 0 10 0 1 2 3 4 5 6 7 8 9 a b c d e f Power setting Hex dBm...

Страница 31: ...Front End MC13192EVB Reference Manual Rev 1 2 Freescale Semiconductor 3 13 Figure 3 14 Current Consumption Versus Power Setting I mA 20 22 24 26 28 30 32 34 36 38 40 0 1 2 3 4 5 6 7 8 9 a b c d e f I...

Страница 32: ...RF Front End MC13192EVB Reference Manual Rev 1 2 3 14 Freescale Semiconductor...

Страница 33: ...is multiplied up to 8 times depending on the usage internal in IC105 A ceramic resonator was selected IC105 is wired to microcontroller SCI2 with 4 connections 1 TXD 2 RXD 3 RTS 4 CTS IC105 is supplie...

Страница 34: ...PCB and MC13192EVB Interfaces MC13192EVB Reference Manual Rev 1 2 4 2 Freescale Semiconductor...

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