Quadrature oscillator having amplitude control means based on a

Details Quadrature oscillator having amplitude control means based on a Quadrature oscillator having amplitude control means based on a

1996-02-06

1998-02-03

Grimm, Siegfried H.

Oscillators

Ring oscillators

331109, 331115, 331135, 331177R, 331183, H03L 500, H03B 502, H03B 506

Patent

active

057149119

ABSTRACT:
A quadrature oscillator includes an amplitude control circuit that is based upon the trigonometric identity sin.sup.2 .omega.t+cos.sup.2 .omega.t=1. The amplitude control circuit, referred to as a Pythagorator, includes two squaring circuits. Each squaring circuit receives a respective quadrature oscillator signal and squares it. The outputs of the two squaring circuits are joined together so as to sum the outputs of the two squaring circuits to produce a sum of squares signal. This signal, a current in the preferred embodiment, is provided to damping diodes coupled to the outputs of the quadrature oscillator. The damping diodes produce a shunt positive resistance at the outputs of the quadrature oscillator in response to this current that has the effect of cancelling the shunt negative resistance of the regenerative elements of the oscillator thereby establishing the amplitude of the quadrature oscillator signals at a desired amplitude.

REFERENCES:
patent: 4973920 (1990-11-01), Kasperkovitz
patent: 5172076 (1992-12-01), Brown
"Analogue IC design: the current-mode approach," Chapter 2 entitled Current-mode Circuits From A Translinear Viewpoint: A Tutorial by Barrie Gilbert, Peter Peregrinus Ltd., pp.10-91, 1990.
"Nonlinear Circuits Handbook", Analog Devices, pp. 78-81, 1976.

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