Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2005-02-15
2005-02-15
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
Reexamination Certificate
active
06856188
ABSTRACT:
A circuit and method that provides a cascode current source/sink with high output impedance. In one example, the dependency on the external load is reduced by directing a compensation current corresponding to change in base current in the cascode (Q1) in an approach such that the compensation current cancels out the error of the cascode (Q1). In a further example, biasing circuitry (200) is included and arranged such that change in base current of the cascode (Q1) is detected and a corresponding current is summed at the emitter of the cascode (Q1) such that the collector current of the cascode (Q1) remains unchanged.
REFERENCES:
patent: 4345217 (1982-08-01), Pace
patent: 4855618 (1989-08-01), Brokaw
patent: 5512815 (1996-04-01), Schrader
patent: 6664842 (2003-12-01), Pobanz
Bright William J.
Corsi Marco
Kinyua Martin Kithinji
Brady W. James
Swayze, Jr. W. Daniel
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
Zweizig Jeffrey
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