Figure 9.3-26. Pmle4427A Vco Schematic - Motorola XTS 2500 Service Manual

UHF2 Schematics, Board Overlays, and Parts Lists
4.6VSF_OUT 4.6VSF_VCO
R257
0
C257 C258
0.1uF 330pF
L251
390nH
D252
L252
390nH
C295
D254
100pF
TP291
TEST_POINT
VCTRL
R251
0
C294
NU
L270
390nH
L271
390nH
C296
100pF
6816985H01-F
Rx_SW
R252
10K
C251
0.10uF
R253
15K
C256
11pF
C253
2.7pF
Q250
C259
11pF
C254
2.0pF
D251
R258
7.5
L255
11.87nH
C255
10pF
D253
Tx_SW
R276
10K
R278
12K
C280
4.3pF
C271
C281
2.0pF
4.3pF
C282
4.3pF
C272
4.3pF
D271
D270
R271
30
L275
9.31nH
C273
4.7pF
D273 D272
TRB
4.6VSF_VCO
L250
390nH
R297 R298
NU
R291
NU
30
R296
0
C250 R299
0
100pF
4.6VSF_VCO
4.6VSF_VCO
1 10
TX_IADJ TX_OUT
2 8
RX_IADJ RX_OUT
3
SUPER_FLTR
4 12
COLL_RFIN U250 PRESC_OUT
L254
5
50U56
390nH RX_BASE
6 7
VCOBIC
RX_EMITTER RX_SWITCH Rx_SW
16 13
TX_BASE TX_SWITCH Tx_SW
15
TX_EMITTER
20
FLIP_IN
19
R259
TRB_IN
330
L273
390nH
R270
120
4.6VSF_OUT
R254 R255
Q251
270K 1K
TP296
TEST_POINT
1
C286
R295
330pF
10K
4.6VSF_VCO
R272
200
L276
C277
22nH
22pF TP299
TEST_POINT
C278
L274 R274
56pF
18nH 20
C276
R273 R275
5.6pF
200 200
4.6VSF_VCO
C262
NU
C267
L259
1.2pF
47nH
R293
20
L258
27nH
C261
100pF
R294
C263
330
2.0pF
TP297
C292 C293 TEST_POINT
L266
100pF 100pF
68nH
PRES_IN
C266
R266
330
NU

Figure 9.3-26. PMLE4427A VCO Schematic

9.3-27
TXRF_OUT
RX_LO_IN
February 14, 2012