Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Reexamination Certificate
2002-05-23
2004-01-20
Cunningham, Terry D. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
C327S073000, C323S312000
Reexamination Certificate
active
06680642
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
N/A
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
N/A
BACKGROUND OF THE INVENTION
A current source that provides a varying output current in response to an analog input voltage should be able to reproduce a high fidelity current representation of that analog voltage signal. Prior art current sources that could provide a high fidelity current signal however, have had several problems. The prior art current sources typically have had a low output impedance, high cross-over distortion, low bandwidth, and phase and amplitude distortion. Although some prior art circuits could overcome some, but not all of these problems, these prior art current sources typically used power supplies that needed to be electrically isolated and have a low coupling capacitance to allow connection to the feedback node as an output. In addition, some current sources that are used in physiological and neural investigations must remove DC current from the electrodes. DC current can result in error in potential measurements, corrosion of the electrodes or damage to the biological tissue.
Therefore, what is needed in the art is a current source that provides a high fidelity current representation of an analog input voltage and that has a high output impedance, low crossover distortion, high bandwidth, low phase and amplitude distortion, and that prevents DC current from the output.
BRIEF SUMMARY OF THE INVENTION
Other forms, features, and aspects of the above-described methods and system are described in the detailed description that follows.
REFERENCES:
patent: 5977757 (1999-11-01), Felps
patent: 6031219 (2000-02-01), Shuke
patent: 6094092 (2000-07-01), Mizuno et al.
Edell David J.
Liu Ying-Ping
Sexton Sean V.
Innersea Technology
Weingarten Schurgin, Gagnebin & Lebovici LLP
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