Figure 9-280.900 Mhz Receiver Back End Schematic Diagram - Motorola HT Series Detailed Service Manual

900 MHz Circuit Board/Schematic Diagrams and Parts List (PCB 8485910Z01)
L350
R350
Vdda
2.2uH
20
C350
10uF
RSSI
RSSI_1_ZIF
1.53V Note 2
RAW_RSSI
0.3V Note 3
R5
L353
IF
100nH
DATA
CLK
LVZIF_SEL
16.8MHz
AGC Processing
U350
5
VCC
R352
R351
4 2.5V Note 2
2
3V Note 3
120
12K NC 1
GND
R353
C355 3
12K
0.1uF
4700pF
109.65MHz Crystal Filter
R358
47K
C371
L354
1 4
IN OUT
470nH FL350
4700pF
C376
L355
R359
C378
C377 100nH
1.5K
12pF
2 3 5 6
4.3pF
0.5pF
Second LO
R362
10K
C386
2.45V
15pF
C388
C389
15pF
13pF
L356
L357
33nH
R363
47K
2.2uH
CR350 C390
13pF
C384
680pF
FE_AGC
C354
IF Amplifier .022uF
R355
C361 10K
C358
C362
0.1uF
4700pF
L352
R356
390nH
1.5K
-30.8 dBm @ 109.65MHz
C365
Note 1, Note 2
5V
3V
8pF
Note 3
U352
C370
C369 C367
0.1uF
4700pF .022uF
2.4V
Note 3
R360
47K 1.4V Note 3
R366 C393
1.5K 0.1uF
C382
10uF
R361
200
C385
2.84V -19.5 dBm @219.3MHz Note 1
Second LO Loop Filter
Q350 9.1pF
C387
15pF
0.5V to 2.7V
1.75V
R365
TP350
3.6K
R364
2K
C394
680pF
C352
.022uF
C353
0.22uF
L351
390nH
C356
C359 100pF
C360 C357
0.22uF 1uF
0.22uF
C363
1uF
PRE_AGC
C4P
C364
36
C4M
1 C3M 35 1uF
RED_VCC
2 C2M 34
RED_VSS
C366
3 C1M 33
PRE_IN
4 VAG 32 1uF
RSSI_OUT
5 U351 LIM 31 GUARD BAND
RSSI_FLT
ROSE_VCC 30
6
EXTBS
7 ROSE_VSS 29
AFC
8 DEMOD_HF 28
TESTD
9 DEMOD_OUT 27
VPP
10 PHASE_LOCK 26
GOLD_VCC
11 25
EMIT VAG_REF
12
BASE
C372 C373
0.22uF
10uF
C379
C380 1500pF
0.1uF
C381
0.1uF
C383
.022uF
SH350 SH351
Second LO IF Amp IF Filter
C391
.01uF LVZIF BTM SHEILD (SOURCE) CRYSTAL FILTER SHEILD
C392
1uF
Notes:
1. Measured using high impedance probe.
2. Measured with -50dBm 938 MHz RX signal at the antenna input.
3. Measured with no RX signal at the antenna input.
Figure 9-280. 900 MHz Receiver Back End Schematic Diagram
9-457
DISC
C374
.022uF
SH352 SH353
LVZIF
LVZIF TOP SHIELD
FL0830710O