Amplifiers – Modulator-demodulator-type amplifier
Reexamination Certificate
2007-07-05
2011-10-18
Shingleton, Michael B (Department: 2815)
Amplifiers
Modulator-demodulator-type amplifier
C330S251000, C330S20700P, C375S238000, C381S120000, C381S121000
Reexamination Certificate
active
08040180
ABSTRACT:
An operational amplifier capable of compensating offset voltage includes an input stage circuit having a positive input end, a negative input end, a first current output end, and a second current output end, for outputting current corresponding to voltage received by the positive and negative input ends, an output stage circuit coupled to the first current output end and the second current output end of the input stage circuit, for outputting voltage according to current outputted from the first current output end and the second current output end, and an trimming device coupled between the input stage circuit and the output stage circuit, for adjusting current of the first current output end or the second current output end for compensating offset voltage.
REFERENCES:
patent: 5917378 (1999-06-01), Juang
patent: 6166596 (2000-12-01), Higashiyama et al.
patent: 6388521 (2002-05-01), Henry
patent: 7239200 (2007-07-01), Ishii et al.
patent: 7268624 (2007-09-01), Chen et al.
Holt “Electronic cirucits digitial and analog” p. 422 John Wiley and Sons copyright 1978.
Hsieh Chih-Yuan
Yen Chih-Jen
Hsu Winston
Margo Scott
NOVATEK Microelectronics Corp.
Shingleton Michael B
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