Multi-phase trapezoidal wave synthesizer used in phase-to-freque

Details Multi-phase trapezoidal wave synthesizer used in phase-to-freque Multi-phase trapezoidal wave synthesizer used in phase-to-freque

1997-06-11

1999-08-24

Chin, Stephen

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375371, 375373, 375375, 327156, 327160, H03D 324, H04L 2536, H04L 2540, H04L 700

Patent

active

059433795

ABSTRACT:
A trapezoidal waveform synthesizer converts a digital phase error signal into a plurality of phase-separated trapezoidal analog waveforms. The trapezoidal waveform synthesizer includes an up/down counter that counts the positive and negative phase errors and generates a multi-bit, parallel digital counter output signal that indicates a cumulative current value of the phase errors. The counter output signal includes a least significant bit (LSB) portion and a most significant bit (MSB) portion. An upper PDM circuit converts the MSB portion of the output signal counter and a portion of the LSB portion of the counter output signal to a plurality of sets of serially-weighted multi-bit output signals. A lower PDM circuit converts the MSB and LSB portions of the counter output signal to a plurality of serially-weighted single-bit output signals. Each of the sets of multi-bit outputs and a corresponding one of the single-bit outputs are provided to an RC circuit that converts the digital signal to an analog voltage such that the waveform synthesizer provides a plurality of phase-separated trapezoidal waveforms.

REFERENCES:
patent: 4376268 (1983-03-01), Moriya et al.
patent: 5056054 (1991-10-01), Wong et al.
patent: 5224125 (1993-06-01), Wong et al.
patent: 5351275 (1994-09-01), Wong et al.
patent: 5646967 (1997-07-01), Hee et al.
patent: 5651036 (1997-07-01), Hee et al.

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