Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2007-05-08
2007-05-08
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S560000
Reexamination Certificate
active
11236673
ABSTRACT:
A switched operation amplifier including a biased circuit, an amplifier circuit, and a buffer circuit is provided. The biased circuit is to provide a first, a second, and a third biased signals by means of an input signal and a reference current source. The amplifier circuit is driven by the biased signals through current mirrors, a sample-and-hold switch, a complementary sample-and-hold switch and a differential pair. The buffer circuit includes a capacitor and two transistors in series. An output signal is generated from a node in between the two transistors, and fed back to a negative terminal of the differential pair of the amplifier circuit. The amplifier circuit charges the capacitor and controls one of the transistors of the buffer circuit until the voltages of a positive and the negative terminal of the differential pair are equal. By means of the operation of the switched op amplifier, the output voltage can be kept being stable.
REFERENCES:
patent: 5789980 (1998-08-01), Nagata et al.
patent: 5959470 (1999-09-01), Sugihashi
patent: 6236269 (2001-05-01), Hojabri
patent: 6236270 (2001-05-01), Takeuchi
patent: 6590980 (2003-07-01), Moraveji
patent: 6987420 (2006-01-01), Miura
patent: 2004/0212425 (2004-10-01), Parkhurst
Aranda Rey
Tra Quan
Troxell Law Office PLLC
Via Technologies Inc.
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