System and method for offsetting load switching transients in a

Details System and method for offsetting load switching transients in a System and method for offsetting load switching transients in a

1996-11-13

1999-05-04

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331177R, 332127, H03C 309, H03L 7085, H03L 718

Patent

active

059007850

ABSTRACT:
A mechanism for reducing a frequency transient appearing at the output of a voltage controlled oscillator (VCO) in a frequency synthesizer when a load is connected to the VCO. In accordance with the present invention, the magnitude and direction of (a) the frequency transient and (b) the frequency deviation of the VCO signal in response to a reference input voltage may be measured, and those measurements used to generate a frequency correction voltage which would cause the VCO signal to deviate in an equal amplitude but in an opposite direction to the frequency transient. The frequency correction voltage then can be applied to the VCO when it is connected to the load so as to substantially cancel the frequency transient.

REFERENCES:
patent: 5231632 (1993-07-01), Yamao et al.
patent: 5319800 (1994-06-01), Erbora et al.
patent: 5438703 (1995-08-01), Ng et al.

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