Current-controlled quadrature oscillator based on differential g

Details Current-controlled quadrature oscillator based on differential g Current-controlled quadrature oscillator based on differential g

1994-11-23

1996-02-06

Grimm, Siegfried H.

Oscillators

Ring oscillators

331115, 331135, 331177R, H03B 502, H03B 506

Patent

active

054898781

ABSTRACT:
An oscillator including two gm/C stages is disclosed. Each gm/C stage includes a differential pair of transistors, a capacitor, and a tunable current source. Alternatively, multi-tanh n-tuplets can be used in place of the differential pairs in the gm/C stages to increase the linearity of the gm/C stage. The gm/C stages include a pair of input terminals, a pair of output terminals, and a pair of common-mode terminals. The two gm/C stages are interconnected in a feedback loop to form a quadrature oscillator. A common-mode biasing circuit is coupled a supply voltage and each pair of common-mode terminals for biasing the respective gm/C stage. The common-mode biasing circuits can include: current mirrors, diode pairs, and even resistors. An optional start-up circuit can be coupled to each gm/C stage to ensure start-up of the associated gm/C stage. The start-up circuit includes a pair of cross-coupled transistors in order to form a negative resistance so as to compensate for the impedance of the subsequent gm/C stage.

REFERENCES:
patent: 5172076 (1992-12-01), Brown
Gilbert, Barrie, "Current-mode Circuits From A Tranlinear Viewpoint: A Tutorial" from Analogue IC Design: The Current-mode Approach, Toumazou, Lidgey, Haigh, eds. Peter Peregrinus, Ltd., London 1990.
Excerpt from Nonlinear Circuits Handbook, Daniel Sheingold, ed., Analog Devices, Inc., Norwood, Mass. 1976.

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