| 摘要 |
PURPOSE:To recover a clock by using a circuit extracting a preamble signal from a burst signal in an excellent way and an analog phase synchronization oscillator with low power consumption using only the preamble signal to recover an excellent clock signal phase-locked to a reception signal. CONSTITUTION:The circuit consists of a preamble extract circuit 1 extracting only a preamble signal from a reception burst signal and of a phase synchronization oscillator 2 generating a clock signal having a nominal frequency corresponding to the reception burst signal and phase-locked to the extracted preamble signal. Only the extracted preamble signal is inputted to the phase synchronization oscillator to synchronize the phase of an output clock signal with a phase of the reception burst signal to stop the input to the phase synchronization oscillator for a data signal reception period and a burst signal intermittent period thereby self-running the oscillator. The preamble extraction circuit 1 consists mainly of a monostable multivibrator 11 having a pulse width of a preamble period and of a retriggerable monostable multivibrator 12 outputting a signal to inhibit the operation of the monostable multivibrator at the reception of a data signal. |
