Figure 8-9. Mnur4001B/D 700-800 Mhz Receiver Front End Circuit - Motorola APX 7000 Detailed Service Manual

8-10
IN
CTRL_RX_78_LNA_A = 3V (HIGH), LNA'S TURN ON
IN
CTRL_RX_78_SW2
C402
33PF
TL_RX_78
IN
C404
33PF
CTRL_RX_78_SW2
C405
33PF
DC_LIN_3V
IN
U408
VCC
NC7WZ04
GND
3
CTRL_RX_78_SW1
U408
NC7WZ04
1 6
IN
Figure 8-9. MNUR4001B/D 700–800 MHz Receiver Front End Circuit
DC_LIN_1_8V_A
Q401
MUN5212T
CTRL_RX_78_LNA_A 22K
1
CTRL_RX_78_SW2 = 0V, 800 PATH SELECTED
CTRL_RX_78_SW1 = 0V, 700 PATH SELECTED
SW1 AND SW2 HAVE TO BE OPPOSITE
L407
7.5NH
C412
C408
15PF
0
U402
AS211334
4
3
V1
J2
FL401
5 2
1 B4232 7
J1 GND IN1 OUT1
3 5
IN2 OUT2
6 1
V2 J3 C413
47PF
CTRL_RX_78_SW1
C409
0
C406
33PF L408
10NH
C414
C410
0 0
U403
AS211334
4 3
J2
V1
FL402
5 2 1 B4232 7
J1 IN1 OUT1
GND
3 5
IN2 OUT2
6 1
V2
J3
CTRL_RX_78_SW1
C411 C415
0
0
C407
33PF
U408
NC7WZ04
4
NC
CTRL_RX_78_SW2
E401
1 2
R403 R404
3.3K 68
R401
22K
3
Q402
BC858CD C424
Q402
5 2
33PF
BC858CD
R402
82K
C421 C422
4.7UF 33PF L402
12NH
C425
L401
3PF
CTRL_RX_78_SW2
U404
12NH
AS211334
1 6
J3 V2
1 U406
2 5
GND J1
BFR380F
C423
3 4
J2 V1
6.8PF
CTRL_RX_78_SW1 L403
2.4NH
C416 C418
33PF 33PF
CTRL_RX_78_SW2
U405
AS211334
1 6
J3 V2
2 5
GND J1
3 4
J2 V1
CTRL_RX_78_SW1
C419
C417
33PF
33PF
Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: VHF/700–800
C427
4.7UF
R413
2.7
R406
2.7
E402
1 2
C426
1PF
R409 R410
3.3K 68
R407
22K
R405
10
Q403 2 5
BC858CD
BC858CD
Q403
R408
82K
C428 C429
4.7UF 33PF
L404
12NH
C430
6.8PF
1
C431 C434
33PF 4.7UF
L405
12NH
R412
2.7
RF_RX_FE_B2_OUT
OUT
C432
3PF
C433
U407
.5PF
BFR380F
R411
L406 10
4.7NH