Voltage controlled oscillator

Details Voltage controlled oscillator Voltage controlled oscillator

2010-01-15

2011-10-11

Kinkead, Arnold (Department: 2817)

Oscillators

L-c type oscillators

C331S1170FE, C331S1170FE, C331S185000

Reexamination Certificate

active

08035457

ABSTRACT:
A voltage controlled oscillator (VCO) includes a voltage controlled current source (VCCS), a negative resistance circuit (NRC), a first transformer, a second transformer, a first transistor and a second transistor. A current terminal of the VCCS receives a control voltage. First terminals of first and second current paths in the NRC are coupled to a current terminal of the VCCS. Primary sides of the first and the second transformers are respectively coupled to second terminals of the first and the second current paths. Secondary sides of the first and the second transformers are first and second output terminals of the VCO, respectively. First terminals of the first and the second transistor are respectively coupled to the secondary sides of the first and the second transformers. Control terminals of the first and the second transformers are respectively coupled to the primary sides of the first and the second transformers.

REFERENCES:
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patent: 7554416 (2009-06-01), Lee et al.
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Deyi Pi et al., “A 2.5-31 GHz CMOS Differentially-Controlled Continuously-Tuned Varactor-Less LC-VCO,” IEEE Asian Solid-State Circuits Conference, Korea, pp. 111-114, Nov. 2007.
Jing-Hong Conan Zhan et al., “A 25-GHz Emitter Degenerated LC VCO,” IEEE Journal of Solid-State Circuits, vol. 39, No. 11, pp. 2062-2064, Nov. 2004.
Chih-Hsiang Chang, Ching-Yuan Yang, “A 0.18-um CMOS 16-GHz Varactorless LC-VCO with 1.2-GHz Tuning Range”, IEEE Asian Solid-State Circuits Conference (A-SSCC), Korea, pp. 107-110, Nov. 2007.
C.-Y. Wu and C.-Y. Yu, “Design and analysis of a millimeter-wave direct injection-locked frequency divider with large frequency locking range”, IEEE Trans. Microw. Theory Tech., vol. 55, No. 8, pp. 1649-1658, Aug. 2007.
“Office Action of Taiwan Counterpart Application” issued on Jun. 22, 2011, p1-p-10, in which the listed references were cited.

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