User's Manual

PLL Synthesizer
The PLL synthesizer circuit is common to both the transmitter and receiver.
The synthesizer comprises:
Data
RF Out
Voltage controlled oscillator module (VCO)
The module contains two VCOs. One for producing carrier frequencies during transmit (TX
VCO) and one for producing the local oscillator frequency during receive (RX VCO). The
module also has RX and TX power line filters. Output is for PLL IC(IC1) Fin.
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TCXO
DC-DC
Converter
Charge Pump
Loop Filter
IC1
PLL
TX OR RX
VCO