Amplifiers – Sum and difference amplifiers
Reexamination Certificate
2006-11-14
2006-11-14
Pascal, Robert (Department: 2817)
Amplifiers
Sum and difference amplifiers
Reexamination Certificate
active
07135920
ABSTRACT:
A method and circuit for facilitating control of the AC coupling for addressing input offset in an amplifier circuit are provided. In accordance with an exemplary embodiment, a control circuit comprises a pair of resistive networks coupled together through a capacitive coupling, with the pair of resistive networks configured between two amplifier devices of the amplifier circuit. The capacitive coupling is configured to prevent offset in the differences between input voltages to the two amplifier devices, and can comprise various types and configurations of capacitor networks, devices and components. The pair of resistive networks is configured to generate an output current signal from the two amplifier devices while facilitating a substantially identical capacitive loading on the two amplifier devices.
REFERENCES:
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patent: 6731163 (2004-05-01), Huckins et al.
Toumazou, C. et al., Extending voltage-mode op amps to current-mode performance, IEE Proceedings, vol. 137, Pt. G, No. 2, Apr. 1990, pp. 116-130.
Koen Myron J.
Venkataraman Harish
Flanagan Krista
Hoel Carlton H.
Pascal Robert
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