Sweep output generator having a frequency modulated local oscill

Details Sweep output generator having a frequency modulated local oscill Sweep output generator having a frequency modulated local oscill

1974-11-26

1976-08-31

Safourek, Benedict V.

Oscillators

Relaxation oscillators

325470, 331178, H04B 134

Patent

active

039784118

ABSTRACT:
A sweep output generator in which an a-c voltage of small amplitude is superimposed upon a sweep voltage applied to a variable reactance element of a local sweep voltage controlled oscillator for sweeping the local oscillator frequency and also for frequency modulation. The frequency modulated local sweep oscillator output and the output of a second voltage controlled oscillator are coupled to a mixer to obtain an intermediate frequency signal. The intermediate frequency signal is frequency demodulated through a frequency discriminator, whose output is in turn integrated to obtain a sweep output voltage of a characteristic similar to the normalized oscillation frequency versus impressed voltage characteristic of the local oscillator.

REFERENCES:
patent: 3588706 (1971-06-01), Sakai
patent: 3798553 (1974-03-01), Sakamoto
patent: 3818353 (1974-06-01), Sakamoto
patent: 3822405 (1974-07-01), Sakamoto
patent: 3845393 (1974-10-01), Basset
patent: 3846707 (1974-11-01), Sakamoto et al.

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