Oscillator with quadrature output in a cross-coupled...

Details Oscillator with quadrature output in a cross-coupled... Oscillator with quadrature output in a cross-coupled...

2006-02-07

2006-02-07

Mis, David (Department: 2817)

Oscillators

Phase shift type

C331S045000, C331S137000, C331S17700V, C455S073000, C455S255000, C455S318000

Reexamination Certificate

active

06995625

ABSTRACT:
An oscillator that provides a quadrature output and has a cross-coupled configuration is disclosed. The oscillator generates an output signal having a frequency. Two phase shift circuits, or stages, are activated by a control signal to provide phase shifts within the oscillator. Each phase shift circuit includes poles to provide the phase shift. A pole includes a varactor to tune, adjust or vary the phase shift accordingly.

REFERENCES:
patent: 3416100 (1968-12-01), Kruse, Jr., et al.
patent: 3667067 (1972-05-01), Levell
patent: 5185581 (1993-02-01), Brown
patent: 5610560 (1997-03-01), Sauer et al.
patent: 0371549 (1989-11-01), None
patent: WO 02/065631 (2002-08-01), None
Miller, et al.,The Distributed RC Variable-Frequency Phase-Shift Oscillator, Microelectron Reliab., vol. 17, pp. 457–460.
Van der Tang, et al.,Analysis and Design of an Optimally Coupled 5-GHz Quadrature LC Oscillator, IEEE Journal of Solid-State Circuits, vol. 37, No. 5, May 2002.

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