Circuits for voltage-controlled ring oscillators and method...

Details Circuits for voltage-controlled ring oscillators and method... Circuits for voltage-controlled ring oscillators and method...

2007-09-11

2007-09-11

Mis, David (Department: 2817)

Oscillators

Ring oscillators

C331S045000, C331S17700V

Reexamination Certificate

active

11119311

ABSTRACT:
Circuits and methods and for generating oscillator outputs using standard integrated circuit components. The basic circuit generally includes two inverters and a variable capacitor to configure a delay of the circuit input and/or output. The oscillator circuit generally includes a plurality of inverter circuits, at least one of which uses a variable capacitor to adjust a delay between stages, and thereby adjust a frequency of oscillation. Thus, the oscillator outputs may be tuned using a single control voltage. The method generally includes the steps of (1) applying an operating voltage to a ring oscillator comprising a plurality of stages; and (2) applying a control voltage to a variable capacitor coupled to a node between at least two of those stages. The circuits have particular advantage in quadrature oscillators, and may be easily implemented using widely available CMOS technology.

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“CMOS Ring Oscillator with Quadrature Outputs and 100 MHz to 3.5 GHz Tuning Range”, M. Grozing, et al., Institute of Electrical and Optical Communication Engineering, 2003, pp. 679-682.

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