Amplifiers – With semiconductor amplifying device – Including signal feedback means
Reexamination Certificate
2000-08-21
2002-10-29
Pascal, Robert (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including signal feedback means
C330S307000, C257S528000
Reexamination Certificate
active
06472942
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to the field of integrated circuits and more particularly to a parasitically compensated resistor for integrated circuits.
BACKGROUND OF THE INVENTION
The gain of a transimpedance amplifier is related to the resistance of a feedback resistor. As a result, to obtain large gains it is necessary to have a large feedback resistor. In an integrated circuit, a large resistor has a large parasitic capacitance that significantly reduces the bandwidth of the amplifier circuit. One solution has been to use a transistor as the feedback resistor. This reduces the parasitic capacitance and large effective resistance values can be obtained. Unfortunately, transistors do not produce a constant resistance value for various currents. This results in an amplifier circuit that does not have a constant gain.
Thus there exists a need for a feedback resistor circuit that does not degrade the bandwidth of the amplifier circuit and provides a constant gain.
REFERENCES:
patent: 5111156 (1992-05-01), Hachiuma
patent: 5780333 (1998-07-01), Kim
patent: 6005280 (1999-12-01), Dierschke et al.
patent: 6137101 (2000-10-01), Yokogawa et al.
patent: 6211769 (2001-04-01), Baldwin et al.
Afriat Gil
Arachtingi John William
Buescher Kevin Scott
Lauffenburger James Harold
EM (US) Design, Inc.
Halling Dale B.
Nguyen Khanh Van
Pascal Robert
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