Block Diagram For Vco - Motorola GP68 Service Manual

LO RF INJECTION
Ext.
Low
Pass Buffer
Filter
(UHF Only)
TX RF INJECTION
Attenuator
DATA (U401 PIN 52)
CLOCK (U401 PIN 53)
SYNEN (U401 PIN 11)
MODIN (U451 PIN'S 19, 20)
+5V (U302 PIN'S 1, 2)
REFERENCE
OSCILLATOR
VOLTAGE
MULTIPLIER
VCO BLOCK DIAGRAM
6,7,8,9,12,14,17,18,19,21,22,24
Rx
2
Buffer
Tx
Low
4
Buffer
Pass
Filter
Prescaler
Buffer
23
PRESCALER RF OUT
SYNTHESIZER BLOCK DIAGRAM
5
DATA
6
CLK
7
CEX
8
MODIN
FRACTIONAL-N
3, 12, 19, 22, 23
VCC, DC5V
14
XTAL1
15
XTL2
16
WARP
20
PREIN
32
VCP
VMULT2
9
U251
VCOBIC
Rx
Osc
Tx
Osc
Tx/Rx/BS
TRB
Switching
Network
VC GND
VCC
13
1,20
3
Low
Pass
Filter
2
LOCK
11
FREFOUT
4, 13, 21, 30
GND
U251
29
IOUT
31
SYNTHESIZER IADAPT
28
MODOUT
1
AUX3
18
SUPFOUT
VMULT1 CPBIASS1
10 27
PRESCALER IN
March, 1997
10
Rx
11 Tank
15
Tx
Tank
16
Tx VCO
5
Modulation
AUX 3 (U201 pin 1)
FILT 5V (U201 pin 18)
PRE-IN (U201 pin 20)
LOCK (U401 PIN 37)
FREF (U451 PIN 35)
STEERING
LINE
2-POLE
LOOP
FILTER
LO RF INJECTION
(U41 PIN 3)
TRB
VOLTAGE
FILTERED 5V
CONTROLLED
OSCILLATOR
TX RF INJECTION
(1ST STAGE OF PA)

Block Diagram for VCO

6881086C09-O
STEERING
LINE
VOLTAGE
AUDIO
IN
2-11