Amplifiers – With periodic switching input-output
Reexamination Certificate
2007-01-24
2009-06-30
Mottola, Steven J (Department: 2817)
Amplifiers
With periodic switching input-output
C330S253000
Reexamination Certificate
active
07554389
ABSTRACT:
A differential amplifier comprises first, second, and third input terminals (1, 2,and3), output terminal (4), first and second differential pairs (531and532) (533and534) driven by a corresponding current source and having output pairs commonly connected to load circuits (537and538), and an amplifier stage (539) having input end connected to at least one of the common connection points of the load circuits and output pairs of the first and second differential pairs and output end connected to output terminal. Input pair of second differential pair receives a signal from third input terminal and a feedback signal from output terminal. First and second switches (SW1and SW2) are provided between the input pair of the first differential pair and the first and second input terminals (1and2), and first and second capacitors (C1and C2) connected between each connection point of the input pair of the first differential pair and the first and second switches (SW1and SW2) and a reference voltage terminal are provided. The first, second and third input terminals (1, 2,and3) may be combined into one terminal to which voltages are serially supplied. It avoids the influence of power supply/signal noise and switch noise, and provides operational output from a plurality of input reference voltages.
REFERENCES:
patent: 6448836 (2002-09-01), Kokubun et al.
patent: 7253679 (2007-08-01), Nishimori
patent: 7368990 (2008-05-01), Tsuchi
patent: 2001-292041 (2001-10-01), None
Iriguchi Masao
Tsuchi Hiroshi
Mottola Steven J
NEC Corporation
Scully , Scott, Murphy & Presser, P.C.
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