| 摘要 |
An oscillator-modulator circuit is disclosed wherein a high modulation index is obtained by shunting across the crystal of an oscillator a first capacitance derived across the output terminals of a modulation amplifier transistor and a second capacitance derived across the input terminals of the oscillator transistor, such first and second capacitances being time varied by the modulation signal. Oscillator startup under low temperature conditions is aided by circuit delay in coupling the effective capacitance of the modulator amplifier transistor in shunt with the crystal, thereby providing higher closed loop gain of the oscillator during the initial start-up time period.
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