Timing recovery circuit for synchronous waveform sampling

Details Timing recovery circuit for synchronous waveform sampling Timing recovery circuit for synchronous waveform sampling

1992-09-30

1994-10-25

Chin, Stephen

Pulse or digital communications

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375118, 329307, 329325, 331 1A, 331 25, H03D 324

Patent

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053596315

ABSTRACT:
A timing circuit having an analog to digital converter to sample an analog signal, a controlled oscillator for controlling sample times of the analog to digital converter, a circuit to detect pulses in the analog signal, a phase error circuit to subtract one of two samples from the other to create a phase error measurement and a frequency error circuit to add two samples together to create a frequency error measurement. The two samples are taken from either side of a pulse. The phase error measurement is used by the controlled oscillator to adjust the sample timing to take samples at desired locations on the pulse. The circuit also contains constant values used to compensate for the pulse being asymmetrical and to compensate for other pulses that occur close to the detected pulse. The circuit also inserts a known frequency in place of the analog signal to establish a frequency of the controlled oscillator.

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