Motorola M3097 Service Manual Page 87
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TDMA M3090/M3097: Down Converter
B4
FL108
FL120
U101
RX_800
RX_1900
X2
VCO
BUFF_VCO
RX_2.75
VCC
RX_IF
FL140
SW_QMOD_KEY
LO_CTL
800*_1900
BAND_SW
DBLR_IN
FE_EN
Description
The RX front end IC(U101) is used as a first amplifier and downconverter for dual-band RF applications. It removes the RX carrier frequency to produce the RX IF signal. U101
also has some internal LNAs for the receive signals and buffers for the VCO signals.
U101 has two RF input ports. One is used for the 800MHz signal and the other is used for the 1900MHz signal. Both signals are amplified within U101 and then routed to an exter -
nal filter(FL108, FL120). The signal is then injected into the Down Converter U101.
In 800MHz mode, the receive signal is mixed with the VCO and the result is the IF signal which is filtered by FL140 prior to enter ing the ZIF/ZYN IC(U401).
In 1900MHz mode, the VCO output (DBLR_IN) goes through a frequency doubler inside U101 before getting mixed with the 1900 MHz receive signal. This process allows the
1900MHz carrier frequency to be removed without the need of a second VCO.
In 800MHz mode, only the 800MHz side of U101 is enabled via the 800*_1900 line. Line 800*_1900 is high in 800MHz mode and low in 1900MHz mode.
Complete operation of U101 can also be disabled by the FE_EN line. A low state at FE_EN will disable U101. When the unit is in a sleep mode condition, the BAT_SAV line is
pulled high. This state causes Q212 to switch on, thu s, grounding the FE_EN line (refer to page B25).
- 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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