Motorola MTR2000 Service Manual page 58

EXCITER MODULE
MODEL 1TX4014A
® a
L.3100
15nH
C3101
100!i'
RF_IN
~
, 5.8pl
I
+3to+9dBm
TX Buffers Service Notes
R3102
R3101
47
C3102
100!i'
R3100
47
Signal
Description/Nominal Signal Levels
Path
@
VCO signal input.
®
MMIC RF amplifier chip. Typical gain is 34 dB.
©
Feedback to the synthesizer chip.
+SV
L.3108
6.8uh
L.3101
220nH
- -
U3100
0®
-
-
@
The final gain stage of the buffer am_Plifier consists of transistor Q3100 biased by Q3101. This stage
~rovides approximately 10 dB of gam. Current control for Q3100 (IC appr. 30
rnA)
is provided by
3101.
®
RF output to Isolation Switch.
68P81094E07-A
Schematics (Sheet 8 of 15)
01/05/97
+10V
L.3112
220nH
R3109
7.64V~
680
-
-
-= -=
R3106
L.3102
22
15nH
R3108
C3105 C3106
390
5.8pl
I
5.8pl I
DIV_BUF
R3120
150
R3117
62
L.3111
1000nH
C3119
C3121
I
10000pF R3110
680
L.3106 -
I
.047~
220nH
-
03101
R3116
2200
...
C3114
C3123
I
10.0UI
R3118
I
820
C3112
R3119
100!i'
33
C3113
® a
L.3107
R3114
22nH
18
,
100!i'
Approximately
C3124
0®
+9 to +13 dBm
I
10!i'
RF_OUT
C3116
R3113
R3115
5.8pl
I
220
220
•
+14dBm
TX BUFFERS