Amplifiers – With semiconductor amplifying device – Including signal feedback means
Reexamination Certificate
2005-06-14
2005-06-14
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including signal feedback means
C330S260000, C330S306000
Reexamination Certificate
active
06906593
ABSTRACT:
A technique for minimizing the effect of parasitic capacitance in a resistive gain amplifier. Instead of the resistors being formed directly over the substrate, or over an oxide of the substrate, a semiconductor element (e.g., an n-well) is used between the resistor and the substrate. For resistors in the input circuit, this semiconductor element is connected to the voltage input rather than ground. For the resistors in the feedback loop circuit, the semiconductor element is connected to the voltage output of the operational amplifier. The insertion of this semiconductor element provides the ability to programmably connect the parasitic capacitance to somewhere other than ground. By connecting the parasitic capacitance to the voltage input or voltage output, the ground connection is eliminated, eliminating the pole introduced by the parasitic capacitance.
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patent: 5744385 (1998-04-01), Hojabri
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patent: 2003/0094954 (2003-05-01), Mashiko
patent: 2003218222 (2003-07-01), None
Fotouhi Bahram
Gregorian Roubik
Exar Corporation
Nguyen Patricia
LandOfFree
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