| 摘要 |
In one embodiment of the invention the frequency of a oscillator is locked to the harmonic of the output of a reference frequency voltage generator by feeding the output voltages from the controllable oscillator and the reference generator to a mixer, capable of producing a direct current voltage output, to produce a control voltage for achieving a locked-in condition or a harmonic of the reference frequency generator output and wherein the output voltage from a further reference frequency generator is mixed with the output of the controllable oscillator to produce a lock disturbing control voltage when the harmonic of the reference generator upon which locked in operation is achieved does not correspond to a particular harmonic of the output frequency of the further reference frequency generator. The frequencies of the reference generators are locked with respect to each other by a divider-frequency discriminator control circuit. |
