Closed loop linearizer for ramp modulated VCO

Details Closed loop linearizer for ramp modulated VCO Closed loop linearizer for ramp modulated VCO

1993-10-25

1995-01-03

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Search sweep of oscillator

331178, 342200, H03B 2300

Patent

active

053790014

ABSTRACT:
A closed loop linearizer method and apparatus for providing a linear ramp modulation for a voltage controlled oscillator (VCO). A counter is connected to the VCO for calculating two frequency values of the oscillator at one or more time points during a ramp interval. The difference of the two frequency values is then compared with that of a predetermined ideal difference frequency value. A resulting correction value is then generated and used to adjust digital control values upward and downward, thereby causing the VCO to produce a linear modulation ramp output slope over time.

REFERENCES:
patent: 3657558 (1972-04-01), Patrickson
patent: 3783392 (1974-01-01), Drake et al.
patent: 4129832 (1978-12-01), Neal et al.
patent: 4430641 (1984-02-01), Baur et al.
patent: 5175509 (1992-12-01), Taylor

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