Amplifiers – With semiconductor amplifying device – Including differential amplifier
Reexamination Certificate
2011-01-11
2011-01-11
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including differential amplifier
C330S257000, C330S255000
Reexamination Certificate
active
07868695
ABSTRACT:
A differential amplifier circuit at the input stage is configured with a twin differential type having a first differential amplifier circuit (11) and a second differential amplifier circuit (12), respective outputs of which are received by a first and a second source-grounded amplifier (M5, M10). The second source-grounded amplifier (M10) is connected to a current mirror circuit (M11, M12), which is driven by the drain current of the second source-grounded amplifier (M10). With this configuration, the dynamic range for the upper half portion of an alternating signal output from an output terminal (OUT) is determined by the current supply capability of the first source-grounded amplifier (M5) and the dynamic range for the lower half portion is determined by the current supply capability of the second source-grounded amplifier (M10). This eliminates the need of a constant current circuit of a large current for generating a signal having lower half portion in which the waveform distortion is improved.
REFERENCES:
patent: 4333058 (1982-06-01), Hoover
patent: 5642062 (1997-06-01), Kawakami
patent: 5714906 (1998-02-01), Motamed et al.
patent: 6137360 (2000-10-01), Memida
patent: 6731170 (2004-05-01), Juang
patent: 6975168 (2005-12-01), Tobita
patent: 7170351 (2007-01-01), Shimatani
patent: 61-078212 (1986-04-01), None
patent: 2002-290172 (2002-10-01), None
Ishiguro Kazuhisa
Takahashi Yoshiaki
Connolly Bove & Lodge & Hutz LLP
Nguyen Patricia
Ricoh Co. Ltd.
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