Tait TM8110 Service Manual

TM8100/TM8200 Service Manual Circuit Descriptions 73
© Tait Electronics Limited June 2006
Figure 3.5 Block diagram of the frequency synthesizer circuitry
Coupler
PLL
MOD
5 V SWITCH
SYN TX LO SYN RX LO1
TR SWITCH
VCO (VHF only)
DIG SYN TR SW
PLL
Summer
5V
VP SUPPLY
Loop
Filter
VCO
Supply
Filter
+5 V DEC VCL SUPPLY
+5 V
VP
Frequency Synthesizer
LPF
Mixer
VCXO
TCXO
Modulator Buffer Amplifier
PLL
MOD
VCO 2
VCO 1
Buffer
Amplifiers
and
Coupler
5 V SwitchTR Switch
VCO (UHF only)
+6V0
AGND +3V0 AN
Power
Supply
CDC VCXO MOD SYN CDC FCL SYN CDC LFV CDC VCO MOD
CODEC
and
Audio
SYN TX LO
SYN RX LO1
Trans-
mitter
SYN RX OSC
Receiver
Digital
Board
DIG SYN SPI DO DIG SYN SPI CLK DIG SYN TR SW DIG SYN EN DIG SYN FAST DIG SYN LATCH SYN LOCK SYN DIG FREF
14 V
SMPS
Buffer Amplifier
Interface
Inverter
+9V0
Signal Types:
RF analog clock digital asynchronous serial data synchronous serial data
LPF
Mixer
VCXO
TCXO
Modulator Buffer Amplifier
Buffer Amplifier
Frequency Control Loop
(FCL)

Tait TM8110 Specifications

General

Brand	Tait
Model	TM8110
Category	Radio
Language	English