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...

2007-04-17

2007-04-17

Mis, David (Department: 2817)

Oscillators

Phase shift type

C331S045000, C331S137000, C331S17700V, C455S073000, C455S255000, C455S318000

Reexamination Certificate

active

11226435

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: 5610560 (1997-03-01), Sauer et al.
patent: 6995625 (2006-02-01), Chien
patent: 0 371 549 (1989-11-01), None
patent: 02/065631 (2002-08-01), None
Tang, J. Van der det al.,“Analysis and Design of an Optimally Coupled 5-GHz Quadrature LC Oscillator,”IEEE Journal of Solid Sate Circuits, vol. 37, No. 5, May 2002.
Miller, C. A. et al., “The Distributed RC Variable Phase-Shift Oscillator,” Microelectronics and Reliability UK, vol. 17, pp. 457-460.

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