Inductive-capacitive (LC) based quadrature voltage...

Details Inductive-capacitive (LC) based quadrature voltage... Inductive-capacitive (LC) based quadrature voltage...

2005-11-29

2005-11-29

Mis, David (Department: 2817)

Oscillators

Plural oscillators

C331S048000, C331S055000, C331S10800D, C331S1170FE, C331S1170FE, C331S172000, C331S17700V

Reexamination Certificate

active

06970048

ABSTRACT:
A circuit and method for generating quadrature signals with a deterministic phase relationship. Between two inductive-capacitive (LC) based quadrature voltage controlled oscillators (VCO), phase shift circuitry is interposed such that the individual LC VCO circuits produce signals with corresponding phase delays which ensure that the desired lead or lag phase relationship between the quadrature signals is achieved.

REFERENCES:
patent: 4763085 (1988-08-01), Lamberg
Peter Vancorenland and Michiel S.J. Steyaert, A 1.57-GHz Fully Integrated Very Low-Phase-Noise Quadrature VCO, IEEE Journal of Solid-State Circuits, vol. 37, No. 5, May 2002.
Pepijn Van De Ven, Johan Van Der Tang, Dieter Kasperkovitz, Arthur Van Roermund, An Optimally Coupled 5 GHz Quadrature LC Oscillator, 2001 Symposium on VLSI Circuits Digest of Technical Papers.
Pietro Andreani, Andrea Bonfanti, Luca Romano and Carlo Samori, Analysis and Design of a 1.8-GHz CMOS LC Quadrature VCO, IEEE Journal of Solid-State Circuits, vol. 37, No. 12, Dec. 2002.

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