Oscillators – With synchronizing – triggering or pulsing circuits
Patent
1980-01-28
1982-03-16
Grimm, Siegfried H.
Oscillators
With synchronizing, triggering or pulsing circuits
331177R, H03L 724
Patent
active
043203604
ABSTRACT:
The phase of a voltage controlled oscillator (VCO) can be controlled and changed by a series of pulses applied through an isolating element such as a capacitor. A small amount of current injected into the reactive element distorts the waveform of the VCO during the period of injection. Depending on the power of the pulse of injected current, a corresponding phase shift in the output of the VCO will result during the period of injection. The pulses are applied at a frequency equivalent to the desired frequency. Assuming the waveform of the VCO to be sinusoidal or otherwise symmetrical, the injected current pulses result in one point on the waveform where the distortion will be symmetrical and stable. The injection of repeated pulses results in this stable point eventually occurring symmetrically about the peak of the VCO waveform thereby locking the phase of the VCO to correspond to the frequency of the injected pulses.
REFERENCES:
patent: 3210691 (1965-10-01), Sprott
patent: 3278862 (1966-10-01), Danzer
patent: 3534285 (1970-10-01), Kobold et al.
Gardner, Floyd M., "Phaselock Techniques," John Wiley & Sons, Copyright 1979, pp. 79 and 90.
P. K. Runge, "Phase-Locked Loops with Signal Injection for Increased Pull-In Range and Reduced Output Phase Jitter", IEEE Transactions, pp. 636-644, Jun. 1976.
Agovino F. R.
Grimm Siegfried H.
Hazeltine Corporation
Onders E. A.
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