Amplifiers – With semiconductor amplifying device – Including signal feedback means
Reexamination Certificate
2011-03-15
2011-03-15
Mottola, Steven J (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including signal feedback means
Reexamination Certificate
active
07907015
ABSTRACT:
An electronic device includes an operational amplifier, with the operational amplifier having an amplifier input stage coupled with a first output node to an amplifier output stage. A compensation capacitance is connected between an output node of the amplifier output stage and the first output node of the amplifier input stage, thereby operating as a compensator for stabilizing the operational amplifier. The compensation capacitance provides a parasitic diode drawing a first leakage current from the first output node of the amplifier input stage, a leakage current compensation circuit being coupled to the first output node of the amplifier input stage and coupled to a second output node of the amplifier input stage for drawing a first current from the first output node and a second current from the second output node. The leakage current compensation circuit is adapted such that the second current is greater than the first current by an amount corresponding to the first leakage current.
REFERENCES:
patent: 4500846 (1985-02-01), Lewyn et al.
Deutsches Patent-und Markenamt Office Action dated Apr. 29, 2008, regarding Application No. 10 2007 048 454.4-35.
“A 12-bit Medium-Time Analog Storage Device in a DMOS Standard Process,” IEEE Journal of Solid-State Circuits, vol. 33, No. 7, Jul. 1998, pp. 1139-1143 (Martin Ehlert and Heinrich Klar).
“An Improved Frequency Compensation Technique for DMOS Operational Amplifiers,” IEEE Journal of Solid-State Circuits, vol. SC-18, No. 6, Dec. 1983, pp. 629-633 (Bhupendra K. Ahuja).
Augustyniak Marcin
Wicht Bernhard
Brady III Wade J.
Kempler William B.
Mottola Steven J
Telecky , Jr. Frederick J.
Texas Instruments Deutschland GmbH
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