Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2006-06-13
2006-06-13
Choe, Henry (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S253000
Reexamination Certificate
active
07061320
ABSTRACT:
A differential amplifier according to the present invention comprises, in addition to a differential amplifier circuit and an output-stage amplifier circuit, a first source follower circuit for buffering a first output signal of the differential amplifier circuit, a second source follower circuit for buffering the first output signal of the differential amplifier circuit, and a source ground amplifier circuit, to a source of which an output terminal of the second source follower circuit is connected, and driven by a second output signal of the differential amplifier circuit, wherein a first-polar transistor in the output-stage amplifier circuit is driven by an output signal of the first source follower circuit, and the second-polar transistor is driven by an output signal of the source ground amplifier circuit.
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Leung, D. L. C. et al., “A 3-V 45-Mw CMOS Differential Bandpass Amplifier for GSM Receivers”, Proceeding of the 1998 IEEE International Symposium on Moneterey, May 31, 1998, pp. 341-344.
Furuya Shigeki
Kimura Hiroshi
Choe Henry
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
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