Third harmonic suppression scheme for a wave used in a phase-to-

Details Third harmonic suppression scheme for a wave used in a phase-to- Third harmonic suppression scheme for a wave used in a phase-to-

1996-05-09

1997-07-22

Bocure, Tesfaldet

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

375376, 327164, H04L 700

Patent

active

056510365

ABSTRACT:
A phase-to-frequency converter uses a triangular waveform synthesizer to generate a triangular wave using both PDM and a DC modulation scheme. A 4-bit PDM and associated logic generates the PDM output waveform with polarity information and two switching waveforms that encode the DC level information to provide a resultant sum. The resulting waveform, after filtering, is the multiple phases of the triangular waveform. The generated multiple phases of the triangular wave are then modified by reducing the ramp rate at appropriate points to suppress the third harmonic and its multiples. The ramp rate is proportional to the pulse density output of the Pulse Density Modulator. In one embodiment, the rate of the PDM output is reduced by one half during appropriate periods by gating the output by its clock, thereby reducing its density by one half during those periods.

REFERENCES:
patent: 4208674 (1980-06-01), Kuniyoshi et al.
patent: 5224125 (1993-06-01), Wong et al.
patent: 5477181 (1995-12-01), Li et al.

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