Seamless switch-over frequency synthesizer

Details Seamless switch-over frequency synthesizer Seamless switch-over frequency synthesizer

1996-03-28

1997-09-30

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Molecular resonance stabilization

331 11, 331 14, 331 17, 331 25, 331 44, H03L 726

Patent

active

056730063

ABSTRACT:
A frequency synthesizer having two atomic frequency standard inputs that is adapted to provide seamless switching or transition between the atomic frequency standard inputs with no change in the synthesizer output phase and frequency. The synthesizer includes a multichannel phase comparison system, each channel adapted for handling an atomic frequency standard input, a digital phase lock loop, a digital to analog converter, and a voltage controlled crystal oscillator which provides the synthesizer output. The phase comparison system is adapted to continually monitor the integrity of the atomic frequency standard inputs and to continually estimate the phase differences between the two atomic frequency standard inputs. The phase difference is used to estimate the proper phase and frequency offset between the primary and secondary inputs. The programmatically determined phase offset and the fractional frequency offset are then passed to the phase lock loop when switch-over is commanded to produce an output signal that tracks the phase of the original primary input.

REFERENCES:
patent: 4188582 (1980-02-01), Cannalte et al.
patent: 5168478 (1992-12-01), Baker

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