Figure 8-160.Receiver Front End Circuit - Motorola APX 1000 Detailed Service Manual

Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: 900 MHz (84012478001)
IF401
IF
1
IN
CTRL_RX_78_LNA_A = 3V (HIGH), LNA'S TURN ON
IF402
IF
1
IN
CTRL_RX_78_SW2 = 0V, 800 PATH SELECTED
CTRL_RX_78_SW1 = 0V, 700 PATH SELECTED
IF403
TL_RX_78
IF
1
IN
RF_RX_78_SW3
DC_LIN_3V
IF407
1
IN
IF
DC_LIN_1_8V_A
Q401
MUN5212T
22K
CTRL_RX_78_LNA_A 1
SW1 AND SW2 HAVE TO BE OPPOSITE
R450 R451
51 51
RF_RX_8_F1IN
FL401
FARG5ED
7 1
IN_800
OUT_800
5 3
IN_900
OUT_900
C451 C413
39PF 39PF
RF_RX_7_F1IN
L408
10NH
RF_RX_7_F1OUT
DNP
R452 R454
51 51
RF_RX_8_F2OUT
FL402
FARG5ED
7 1
IN_800 OUT_800
5 3
IN_900 OUT_900
C453 C455
39PF 39PF
RF_RX_7_F2OUT
RF_RX_7_F2IN
E401
DC_RX_78_LNA_A
R403 R404
3.3K 68
R401 DC_RX_78_LNA_D
22K DC_RX_78_LNA_C
3
Q402
C424
BC858CD
Q402 5 2 33PF
BC858CD
R402
82K
DC_RX_78_LNA_B
CTRL_RX_78_LNA_B
DC_RX_78_LNA_E
C421 C422
4.7UF 33PF
L402
10NH
RF_RX_78_LNA1_C
RF_RX_78_LNA1_A
L401
10NH
C425
5PF
RF_RX_78_LNA1_B
C426
RF_RX_78_SW2
U406
1 1PF
BFR380F
C423
RF_RX_78_LNA1_F
30PF
RF_RX_78_LNA1_E
C484
1PF
L403
2.7NH
R447
10
D401
MMBD352
DNP
RF_RX_78_LNA2_B
RF_RX_78_LNA2_A
C485
RF_RX_78_LNA2_E
1PF
R448
10
C427
4.7UF
R413
2.7
E402
DC_RX_78_LNA_F
R406
0
DC_RX_78_LNA_G
R409 R410
3.3K 68
R407
22K
R405
10
Q403
BC858CD
Q403 2 5
BC858CD
R408
R456
82K
0
DC_RX_78_LNA_I
DC_RX_78_LNA_J
C428 C429
4.7UF 33PF
RF_RX_78_LNA2_F
L405
10NH
RF_RX_78_LNA2_C
R412
L404
5.1
15NH
C488
C432
2.7PF
8.2PF
L489
C433
8.2NH
1 U407 1PF
BFR380F
C430
RF_RX_78_LNA2_D
30PF
R411
10
L406
2.4NH
R457
0
Figure 8-160. Receiver Front End Circuit
8-343
DC_RX_78_LNA_H
C431 C434
33PF 4.7UF
C492
IF406
2.7PF
IF
1
OUT
C490
1.5PF
RF_RX_FE_B2_OUT
L491
8.2NH