50u54 – Motorola CP150TM User Manual
Page 223
UHF (438-470 MHz) Schematic Diagrams, Overlays, and Parts Lists (8486348Z13-C)
12-41
6880309N62-C
June, 2005
3.5 V to 10 V
4.5 V
RX: 0 V
TX: 3 V
0.98 V (Rx)
4.97 V (Rx)
293 mV RF (Rx)
+8 dBm
1.64 V (Rx)
66.3 mV RF (Rx)
-6.7 dBm
276 mV RF (Rx)
+11.7 dBm
1SV229
D262
220nH
L255
13
VCC_BUFFERS
14
VCC_LOGIC
18
R261
22K
8
RX_SWITCH
7
SUPER_FLTR
3
19
TRB_IN
TX_BASE
16
TX_EMITTER
15
TX_IADJ
1
TX_OUT
10
TX_SWITCH
20
GND_BUFFERS
11
GND_FLAG
9
17
GND_LOGIC
PRESC_OUT
12
RX_BASE
5
RX_EMITTER
6
RX_IADJ
2
RX_OUT
50U54
U251
COLL_RFIN
4
FLIP_IN
L251
220nH
NU
VCO_5R
L283
C273
.01uF
C254
2%
5.1pF
C255
0.1%
5.6pF
33
R263
1
C257
12pF
1%
SH251
SHIELD
390pF
C270
0.1%
2.4pF
C266
220nH
L265
220nH
L270
100
R264
L264
2%
12.5nH
C265
3.0%
3.3pF
390pF
C283
33
R274
L252
27nH
C253
1.6%
6.2pF
C284
R262
6.8K
390pF
D261
C264
5%
2pF
C263
2.1%
4.7pF
R275
100
330
R273
1
3
2
R285
0
BFS540
Q280
D251
VCO_TRB
5.1K
R271
VCO_V_STEER
0.1uF
C281
390pF
C292
C285
VCO_TX_INJ
390pF
L254
2%
12.5nH
C286
6.2pF
390pF
C275
C282
NC
V_SF
3.3pF
C290
6.8pF
18pF
C291
390pF
C271
NU
L271
5.6K
R272
SH253
SHIELD
1
C274
0.1uF
SH250
SHIELD
1
L262
27nH
VCO_RX_INJ
C268
0.5pF
V_SF
33
R253
R280
4.7K
C256
2.5%
3.9pF
C252
L281
27nH
NU
910
NC
VCO_MOD
R282
VCO_VSF
R283
150
7.5pF
1.3%
C267
C272
0.1uF
R284
220
27nH
L276
0
R277
1K
R276
VCO_3V
150pF
C251
R281
8.2K
V_SF
L272
220nH
L291
6.8nH
100
R254
VCO_PRESC
15nH
L292
6.8pF
15nH
C276
TX_INJ
L282
5R
VCO_MOD
PRESC
V_STEER
RX_INJ
V_SF
3V
TRB
Figure 12-31. UHF (438-470 MHz) Voltage Controlled Oscillator Schematic Diagram (8486348Z13-C)