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TDMA M3090/M3097: RF Detect Circuit
B20
Description
The RF detect circuit is used to detect the RF amplitude level of the TX signal. RF detect reports back to U201 (DCI) pin 31, using a dc level, for amplitude stabilization.
The RF detect circuit is RF coupled with the TX signal from either band, 800MHz or 1900MHz. The RF input is then converted into a dc level and sent to the
RF_DETECT line. There are two stages in the RF detect circuit which are used to increase the dynamic range of the RF detect output. The two stages are controlled by
the TX_STEP line input. TX_STEP is high when power steps 0 through 5 are used . TX_STEP is low when power steps 6 through 10 are used .
When TX_STEP is low Q902-A is switched off and Q901 is switched on. Since Q902-A is switched off , the supply to diode CR903 gets cut off thus not forward bias-
ing CR903 and not letting any signal through. By Q901 being switched on, it supplies the desired current to amplifier Q904 and at the same time Q901 also switches
Q902-B on. Having Q902-B on will forward bia s diode CR904, letting the signal through.
When TX_STEP is high Q902-A is switched on and Q901 is switched off. Since Q901 is switched off, the supply to amplifier Q904 is cutoff and also Q902B is
switched off, thus not forwa rd biasing CR904 and not letting any signal flow through. Having Q902-A on will forward bias diode CR903 lettin g the signal through.
In summary, during high power steps the signal is sent directly to the RF _DET output through CR903. During low power steps the signal passes through amplifier Q904
and then sent to the RF_DET output through CR904.
CR903
Q904
CR904
CR902
Q902-A
SW_QMOD_KEY
TX_STEP
SW_QMOD_KEY
TX_STEP
TX_2.75
DET_800_1900
RF_DET
Q901
Q902-B
- 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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