Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
1998-12-23
2001-01-30
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S543000, C323S316000
Reexamination Certificate
active
06181195
ABSTRACT:
BACKGROUND OF THE INVENTION
This application is related to an impedance transport circuit and more particularly to a circuit which is capable of transporting both AC and DC impedance.
Many electronic circuits require a high input or output impedance. However, circuits with high magnitude currents require large transistors to create high input or output impedance. Typically, large transistors are not desired. Hence, a trade off is left between high current capability and high output impedance.
It is an object of this invention to provide a circuit which can transport a desired impedance to a high current circuit by utilizing small transistors.
It is yet another object of this invention to provide a circuit which transports both input AC and DC impedance to the output.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is disclosed an impedance transport circuit which is capable of transporting an AC input impedance to an output impedance and invert its polarity. This impedance transport circuit utilizes two MOS transistors and an Op-Amp which causes the drain voltages of the transistors to be equal.
In accordance with another aspect of the present invention, there is disclosed an impedance transport circuit which is capable of transporting both AC and DC input impedance to an output impedance. This impedance transport circuit utilizes four MOS transistors and two Op-Amps which cause the drain voltages of all transistors to be equal.
REFERENCES:
patent: Re. 30586 (1981-04-01), Brokaw
patent: 4399399 (1983-08-01), Joseph
patent: 5212458 (1993-05-01), Fitzpatrick et al.
patent: 5285148 (1994-02-01), Uhlenhoff et al.
patent: 5666046 (1997-09-01), Mietus
patent: 5694033 (1997-12-01), Wei et al.
patent: 5821768 (1998-10-01), Rau
Callahan Timothy P.
Cunha Robert
Nguyen Hai L.
Xerox Corporation
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