Generator circuit for generating two sinusoidal signals with a p

Details Generator circuit for generating two sinusoidal signals with a p Generator circuit for generating two sinusoidal signals with a p

1985-12-13

1987-07-28

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 38, 331 40, 331 41, 331 45, H03B 2102, H03L 718

Patent

active

046834443

ABSTRACT:
A generator circuit according to the invention generates two 90.degree. phase-shifted frequency-variable sinusoidal signals by mixing the output signal of a fixed-frequency oscillator and of a continuously variable oscillator with the aid of two multipliers operating as mixers. The fixed-frequency signal is applied to the second multiplier via a 90.degree. phase shifter. The output signal of the multipliers which contains the sum and the difference frequency of its input signals, is respectively fed to a low-pass filter or to a band-pass filter, which suppresses the sum frequency or the difference frequency respectively. By the 90.degree. phase shifter, the sinusoidal signal is phase-shifted with respect to the sinusoidal signal by exactly 90.degree.. During the continuous variation process, the signal as applied to the 90.degree. phase shifter remains stable in its frequency, whereas the output signal of the continuously variable oscillator as fed directly to the two multipliers, is changed in its frequency.

REFERENCES:
patent: 2920284 (1960-01-01), Beagles et al.
patent: 3961262 (1976-06-01), Gassmann
patent: 3999130 (1976-12-01), Whisler
patent: 4193035 (1980-03-01), Berger

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