Phase-controllable oscillator

Details Phase-controllable oscillator Phase-controllable oscillator

1990-01-23

1991-05-21

Grimm, Siegfried H.

Oscillators

Polyphase output

331 61, 331 75, 331113R, 331144, H03K 3282, H03B 2700

Patent

active

050178903

ABSTRACT:
A phase-controllable oscillator consists of a capacitance and an apparatus for charging and an apparatus for discharging the capacitance. In addition, feedback is provided for activating the charging and discharging apparatus in dependence on the oscillator signal. An amplifier for amplifying the capacitance voltage can be phase-controlled by providing the amplifier with a control input for adjusting the phase difference between a zero-crossing of an amplifier output signal on the one hand and a reference phase in the oscillator signal on the other hand. In order to maintain the duty cycle, a switching apparatus is provided for reversing the polarity of the control input under the control of the oscillator signal.

REFERENCES:
patent: 4563597 (1986-01-01), Betzold
Ballatore, "Precision Phase Shifter", IBM Technical Disclosure Bulletin, vol. 23; No. 10, Mar. 1981, pp. 4513-4514.

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