Voltage controlled oscillator having varactor and transistor...

Details Voltage controlled oscillator having varactor and transistor... Voltage controlled oscillator having varactor and transistor...

2006-08-08

2006-08-08

Chang, Joseph (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S1170FE

Reexamination Certificate

active

07088195

ABSTRACT:
An LC-VCO in which two spiral inductors are provided in layers of a multilayer interconnection layer, while varactor elements and N-channel transistors are positioned in an region underlying the two spiral inductors, the region excluding the center axes of the spiral inductors. This allows use of a reduced layout area for the LC-VCO, while preventing magnetic fields created by the spiral inductors from having adverse effects on the operation of the varactor elements and the N-channel transistors.

REFERENCES:
patent: 5912596 (1999-06-01), Ghoshal
patent: 5952893 (1999-09-01), Ghoshal
patent: 2004/0183606 (2004-09-01), Komurasaki et al.
patent: 2002-9299 (2002-01-01), None
Ali Hajimiri, et al., “Design Issues in CMOS Differential LC Oscillators”, IEEE Journal of Solid-State Circuit, vol. 34, No. 5, May 1999, pp. 717-724.

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