Motorola M3097 Service Manual Page 89
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TDMA M3090/M3097: ZIF_SYNTH (U401)
B6
Description
U401(ZIF_SYNTH) can be divided into two functional subsystems: The ZIF (Zero-Intermediate-Frequency) which provides all of the functions of the back-end of a
receiver, and the SYN (SYNthesizer) which contains phase-locked loops and modulators to produce the Local Oscillator (LO) and modulated transmit carrier.
The ZIF implements the back end of the receiver. The incoming signal is attenuated, amplified and mixed down to an extremely low frequency(Baseband)-not quite DC.
The first amplifier and an Automatic Gain Control(AGC) circuit adjusts the amplifier gain to maintain a constant level in the baseband filter. C401 is used to add stability
to the AGC circuit.
The first mixing that occurs in th e ZIF requires a 2nd Local Oscillator that is running at 221.184MH z. The 2nd LO is divided down the n phased shifted before being
mixed with the IF signal., producing the baseband signal
The baseband signal is low-pass filtered using a programmable low-pass filter. In TDMA mode, the baseband signal is routed to U201(DCI) via the RX_I and RX_Q
lines. In analog mode, the baseband signal is up-converted and then FM-demodulated, producing the DEMOD signal which is routed to U201(D CI) for filtering and de-
emphasis.
The RSSI(Receive Signal Strength Indicator) is a voltage that increases with respect to the received signal strength.
The SPI Bus is a serial interface used to program the internal filters and frequency di viders for U401, allowing selectivity of cellular channels.
RF 19.44Mhz input is used to p rovide a frequency reference for U401.
IF
2nd LO
C401
Shifter
SPI BUS
8/16/96 BIT
MODES
U1000
SPI BUS
DATA
CLK
CEX
RSSI
AGC_RSSI
MAIN
LOOP
Offset
LOOP
LP_SWITCH
VCO
Offset VCO
Cap
Filters
Ref Osc
19.44MHz
RX_Q
RX_I
Demod
UP
Converter
DEMOD
U401
Step
Atten.
- TDMA M3090/M3097 1
- Service Manual 1
- Level III 1
- COMPUTER SOFTWARE COPYRIGHTS 2
- About This Manual 4
- Specifications 6
- ©1999Motorola, Inc 7
- Table 3. DAMPS System 7
- Table 4. Environment 7
- Table of Contents 8
- Section B 11
- Cellular Overview 12
- US Cellular Frequency Band 13
- 832 channels 13
- Analog Cellular 16
- Cellular System 17
- AMPS Deviation in kHz 18
- Going Into Service 20
- ©1999 Motorola, Inc 23
- Figure 9. Cell Site Handoffs 25
- Cellular Telephone 26
- Landline Network 26
- Switch / Cell Site 26
- Amplitude (voltage) 28
- Microphone Speaker 30
- Accessories 32
- TDMA Easy NAM 34
- Programming 34
- Programming Sequence 35
- TDMA Test Mode 36
- NAM Programming 36
- IMPORTANT 37
- Factory 38
- Manual Test Mode 42
- Servicing Level 43
- Status Display Line 1 44
- Status Display Line 2 44
- Test Procedures 46
- Zero Bd-P3 47
- RF Cable Test 48
- Set up for Analog call 49
- RX Sensitivity Test (SINAD) 50
- TX Power Out Test 51
- 834.9900 52
- TX Maximum Deviation Test 53
- TX SAT Deviation Test 54
- TX ST Deviation Test 55
- On / Off 56
- ON / Off 56
- Set up for TDMA call 58
- >= -51 59
- < 0.01 59
- BER Measurements 60
- TX Power Measurements 61
- -2.35879 62
- Disassembly 64
- Battery Removal 65
- Antenna Removal 66
- Back Housing Removal 66
- Transceiver Board Removal 67
- Display Removal 67
- Keypad Removal 68
- Speaker Removal 68
- TDMA M3090/M3097Disassembly 69
- Parts List 70
- TDMA M3090/M3097Parts List 71
- General Description 72
- 1900 MHz IC 73
- TX Operational Description 73
- Analog TX Audio Processing 74
- Digital TX Audio Processing 74
- DSP Lucent 1629 74
- Stuart IC 75
- Figure 40. RF Block Diagram 76
- Figure 41. AL Block Diagram 77
- Electrical Parts List 78
- Service Diagrams 84
- Internal External 86
- 800*_1900 87
- -30.47 dBm@Cellular 88
- 992.31MHz 88
- RF_19.44MHZ 90
- TDMA M3090/M3097: VCO 91
- TX SIGNAL 94
- VCC_OFFSET 96
- OVCO_OUT 96
- TDMA M3090/M3097: Amp Drivers 97
- TX ON TX OFF 100
- Description 101
- DET_800_1900 102
- -10 dBm 106
- -11 dBm 106
- TDMA M3090/M3097: DCI (U201) 107
- TDMA M3090/M3097: DCI(U201) 108
- BLOCK DIAGRAM NOT NECESSARY 109
- REFER TO PAGE B27 109
- MIC_BIAS 110
- AUDIO_OUT 110
- [email protected] 110
- VOLTAGE SUPPLIES 112
- SW_EXT_B+ 114
- TDMA M3090/M3097: Charger 115
- Battery type 116
- BLOCK DIAGRAM NOT NECESSARY 117
- REFER TO PAGE B35 117
- U1000,U1500 118
- TDMA M3090/M3097: Headset/MIC 119
- TDMA M3090/M3097: DSP (U1900) 121
- TDMA M3090/M3097: DSP(U1900) 122
- REFER TO PAGE B41 123
- U201,CR1561 124
- REFER TO PAGE B43 125
- BOOM_MIC_DET 126
- U1700,U1200 126
- U1500,U1800 126
- TDMA M3090/M3097: Memory 127
- TDMA M3090/M3097: MEMORY 128
- TDMA M3090/M3097: Keypad 129
- Board Issue: P5 132
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