Method and means for linearizing a voltage controlled oscillator

Details Method and means for linearizing a voltage controlled oscillator Method and means for linearizing a voltage controlled oscillator

1977-06-20

1978-12-12

Grimm, Siegfried H.

Oscillators

With frequency calibration or testing

328184, 331178, H03B 2300

Patent

active

041298322

ABSTRACT:
A method of linearizing a voltage controlled oscillator wherein a control signal is shaped into ramp form by a memory and transmitted to the control input terminal of a voltage controlled oscillator to be linearized thereby causing the oscillator to generate a chirp. Nonlinearities in the chirp are detected and the memory reprogrammed so as to diminish detected nonlinearities by reshaping the ramp control signal.
A system for linearizing a voltage controlled oscillator is also disclosed having a random access digital control memory coupled with the voltage control terminal of a voltage controlled oscillator to be linearized, a power divider coupled with the output terminal of the oscillator, a mixer coupled with the power divider by two conductive lines of differing time delays, and an x-y axis signal display coupled with the mixer, whereby the memory may be programmed to input a ramp control signal to the oscillator and difference frequency signal detected in the chirp output signal generated by the oscillator and compared with a reference frequency signal on the display to detect nonlinearities in the chirp which may be substantially reduced by reprogramming of the control memory.

REFERENCES:
patent: 3764933 (1973-10-01), Fletcher et al.
patent: 4038612 (1977-07-01), Borofka et al.

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