Frequency and phase-locked two-phase digital synthesizer

Pulse or digital communications – Receivers – Angle modulation

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

375327, 375376, 331 31, H04L 2714, H04L 2716

Patent

active

055770738

ABSTRACT:
For use with a quartz angular rate sensor, a frequency and phase-locked synthesizer recovers a reference signal virtually free of phase noise, and generates a quadrature-phase reference signal for complex demodulation of the angular rate signal. The synthesizer also ensures a precisely adjusted phase shift of approximately zero across the drive tines of the sensor. Moreover, the digital synthesizer provides a precise numerical indication of the drive frequency, which can be used for compensation and automatic tuning of filters, such as a tracking filter, a filter in an automatic gain control, and notch filters in the phase and/or frequency detectors in the digital synthesizer. The tracking filter is used as a pre-filter for the synthesizer, and is responsive to a passband-width control signal generated from the magnitude of the frequency and phase error signal controlling the frequency generated by the synthesizer. Preferably the synthesizer has an oscillator controller for producing a pair of frequency control signals that are the sine and cosine of a frequency control parameter (.phi.), and one of these control signals is generated from the other by a polynomial approximation. To compensate for roundoff error, when one of the in-phase or quadrature-phase outputs has a magnitude less than a limit value, a compensated value for the other output is computed from an even polynomial of the magnitude.

REFERENCES:
patent: 4893316 (1990-01-01), Jane et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Frequency and phase-locked two-phase digital synthesizer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency and phase-locked two-phase digital synthesizer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency and phase-locked two-phase digital synthesizer will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-546945

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.