Quadrature VCO using symmetrical spiral inductors and...

Details Quadrature VCO using symmetrical spiral inductors and... Quadrature VCO using symmetrical spiral inductors and...

2006-04-11

2006-04-11

Chang, Joseph (Department: 2817)

Oscillators

Plural oscillators

Cascade or tandem connected

C331S046000

Reexamination Certificate

active

07026880

ABSTRACT:
A quadrature VCO includes two cross-coupled differential pairs, two parallel LC tank circuits, two LO units and a plurality of source followers, supplying by a tail current source and a tail capacitor. The LC tank circuit constitutes of symmetrical spiral inductors and differential varactors, which constitutes of common anode diodes. The quadrature VCO circuitry is implemented on a chip with 2.4 GHz operating frequency. The quadrature VCO generates quadrature LO signals with high phase accuracy and good gain match under low power, good phase noise and small chip area, thus it can be applied to a variety of integrated transceivers.

REFERENCES:
patent: 5489878 (1996-02-01), Gilbert
patent: 5617051 (1997-04-01), Bingham
patent: 5952893 (1999-09-01), Ghoshal
patent: 6456167 (2002-09-01), Huang
patent: 2002/0039039 (2002-04-01), Maligeorgos

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