Controllable quadrature oscillator

Details Controllable quadrature oscillator Controllable quadrature oscillator

1989-11-16

1990-11-27

Pascal, Robert J.

Oscillators

Polyphase output

331108B, 331135, H03B 2700

Patent

active

049739204

ABSTRACT:
A controllable quadrature oscillator, having a pair of oscillator outputs for supplying a pair of phase quadrature oscillator signals, is a cascade circuit of two quadrature sections incorporated in a regenerative loop each contributing a 90.degree. phase shift in the regenerative state of the loop. In order to increase the frequency control range of such a controllable quadrature oscillator and to enable realization by integrated circuit technology, each quadrature section is formed of two stages in cascade arranged in a signal path between an input terminal and an output terminal for the quadrature section. One of the stages includes a first amplifier having a low-pass characteristic and the other of the stages includes a second amplifier having a low-pass characteristic and having a feedback path. The gain of at least one of the two amplifiers is controllable for controlling the frequency of the pair of phase quadrature oscillator signals.

REFERENCES:
patent: 3936773 (1976-02-01), Wilkinson
patent: 4145670 (1979-03-01), Bode

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