Motorola M3097 Service Manual Page 95
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TDMA M3090/M3097: MERLIN (U601)
B12
Description
U601 is a TX modulator. It takes the TX information and modulates it on a carrier for RF transmission.
In analog mode the offset oscillator with the FM enters U601 and gets mixed with the main VCO. The resulting signal is a differential carrier with the modulated information.
The carrier is then passed through an IQ modulator. The A_D line from the DCI (U201) controls the state of the IQ modulator. In analog mode, the IQ modulator simply
feeds the carrier though to a voltage controlled amplifier(VCA). The gain of the VCA is controlled via the AOC_CNTL line, therefore, controlling the TX power steps of the
transceiver. Once the carrier passes through the VCA, it passes through the cellular final power amplifier which is still internal to U601.
In digital mode the offset oscillator doesn't contain the modulated information from the FM line. The offset oscillator is mixed with the main VCO and a differential out-put
signal is sent through the IQ modulator. In digital mode, the A_D line configures the IQ modulator to allow IQ modulation to the carrier. The result carrier signal is then
passed through the Voltage Controlled Amplifier(VCA). The gain of the VCA is adjusted by the AOC_CNTL line, thus controlling the TX digital power steps of the
transceiver.
When operating in the 800MHz band the carrier is routed through the cellular final power amplifier and out to the 800MHz transmit circuit. In 1900MHz mode the cellular
final power amplifier is disabled via the 800*_1900 line and the VCA output is routed to filter FL620 for noise and spurious performance improvement. The differential out-
put is then routed into a PCS upconverter where the signal is upconvertered to a PCS frequency by mixing the carrier signal with the main VCO. The output of the PCS
upconverter is then routed to a Balun (XFMR601) for single ended signal conversion. The newly created single ended TX carrier signal is then filtered by FL601 and routed
through the PCS power amplifier internal to U601 before ente ring the 1900 TX exc iter circuit.
The TX_STEP line is used to control the biasing to the cellular final amplifier, PCS final amplifier, and the PCS upconverter. This line is used as a course gain control for
the final amplifiers and PCS upconverter.
Main VCO
Offset Osc
U1000
U201
DCI
U401
ZIFSYN
800*_1900
TX_STEP
TX_Q
TX_I
FM
U601
MERLIN
FL601
FL620
1900
800
IQ
Mod
XFMR601
AOC_CNTL
U101
- 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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