| 摘要 |
An oscillator circuit having a phase control circuit performing phase control on the oscillation signal based on a signal representing a phase difference between a signal input from outside and the oscillation output so that the oscillation frequency follows the frequency variation of the signal input from outside. The phase control circuit includes a phase shifting circuit for forming the oscillation signal into first and second signals having a phase, difference of approximately 45 DEG . The phase control circuit subtracts the second signal from the first signal vectorially to form a third signal, and also inverts the second signal to form a fourth signal. Depending on the level of the phase difference signal, the phase control circuit outputs a composite signal of either the second and third or the third and fourth signals.
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