Tait TB9100 - Page 90

90 RF Circuitry TB9100 Reciter Service Manual
© Tait Electronics Limited January 2006
Figure 6.2 Reciter Receiver Synthesizer Block Diagram
/R
/N
12.8MHz
Reference
Oscillator
Receiver VCO
Programmable
Reference Divider
Programmable
VCO Divider
Phase
Detector
Lock Detect
Output
Charge
Pump
f
ref
f
VCOfb
Software
Register
VCO Feedback
Attenuator
Lock Detect
Circuitry
64/65
Prescaler
Frequency Synthesizer IC
Loop
Filter
VCO
LNA
Buffer
Harmonic
Filter
Fixed Slope
Attenuator
Final
Driver
+20dBm LO
Clock
Data
Chip Select/Latch Enable
Serial Bus