Oscillators – L-c type oscillators
Reexamination Certificate
2008-08-18
2010-10-26
Chang, Joseph (Department: 2817)
Oscillators
L-c type oscillators
C331S1170FE, C330S302000
Reexamination Certificate
active
07821349
ABSTRACT:
Provided is a differential cascode voltage-controlled oscillator that can reduce a phase noise by the use of a quality factor enhancement technique with negative conductance and can mitigate a ground-caused noise effect by the use of a cascode connection technique. The differential cascode voltage-controlled oscillator includes an AC signal generator, and first through fourth cascode amplifiers. The AC signal generator generates an AC signal with a certain frequency according to a control voltage. The first cascode amplifier is connected in a cascode configuration, and amplifies the AC signal to output the resulting signal to a first output terminal. The second cascode amplifier is connected in a cascode configuration and connected to the first cascode amplifier in a cross-coupled configuration, to amplify the AC signal to output the resulting signal to a second output terminal. The third cascode amplifier is connected in a cascode configuration to amplify the AC signal to output the resulting signal to the first output terminal. The fourth cascode amplifier is connected in a cascode configuration and connected to the third cascode amplifier in a cross-coupled configuration, to amplify the AC signal to output the resulting signal to the second output terminal. Herein, the first and second cascode amplifiers and the third and fourth cascode amplifiers are symmetrically connected to differentially amplify the AC signal.
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“A CMOS LC VCO with Differential Second Harmonic Output” by Hyun Kim, on A paper of The Institute of Electronics Engineers of Korea vol. 44, as of Jun. 2007.
Korean Office Action issued on Jan. 20, 2009 in corresponding Korean Patent Application 10-2007-0096921.
Korean Notice of Allowance issued Jun. 1, 2009 in the corresponding Korean application No. 10-2007-0096921.
Choi Sang-Sung
Jang Seung-Hyun
Lee Seung-Sik
Park Bong-Hyuk
Chang Joseph
Electronics and Telecommunications Research Institute
Staas & Halsey , LLP
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