Control circuit for establishing voltage-controlled or injection-locked operation of a synthesizer reference oscillator
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United States of America Patent
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-
Jan 27, 1981
Grant Date -
N/A
app pub date -
Feb 15, 1979
filing date -
Feb 15, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a synthesizer system having a reference oscillator selectively operable in either a voltage-controlled or an injection-locked mode, a circuit for effecting the appropriate mode of operation. The circuit includes an analog gate coupled between the output of a crystal oscillator and the input of the reference oscillator. The analog gate is driven by a logic element responsive to a plurality of signals indicative of specific operating conditions. In particular, the circuit assures that the reference oscillator is coupled to the crystal oscillator, that is, the reference oscillator operates in the injection locked mode, while the synthesizer PLL achieves acquisition.
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