Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-07-07
1997-02-18
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330258, 330311, H03F 345
Patent
active
056044640
ABSTRACT:
Disclosed herein is a cascode operational amplifier design with multiple input stages, and methods of operating the same, resulting in enhanced output gain and unity gain bandwidth operational amplifiers. The cascode operational amplifier comprises a differential input block which receives a differential input having a first differential input stage and a second differential input stage. A cascode block is coupled to the differential input block and provides a differential output for the operational amplifier. A common mode feedback block coupled to the second differential input stage of the differential input block and the differential output of the cascode block stabilizes a DC output level for the differential output. A load block is coupled to the differential output of the cascode block and applies a resistive load to the differential output in response to a differential input signal applied to the differential input block.
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patent: 5117199 (1992-05-01), Wang et al.
De La Plaza et al, "Power-Supply Rejection in Differential Switched-Capacitor Filters", IEEE Journal of Solid-State Circuits, vol. SC-19, No. 6, Dec. 1984, pp. 912-918.
Proceedings of the Custom Integrated Circuits Conference, Boston, May 13-16, 1990. No Conf. 12, 13-16 May 1990, Institute of Electrical and Electronics Engineers, pp. 1211-1215, XP 000167685; Nicholas van Bavel, et al. "ISDN U Transceiver Analog Front-End".
Proceedings of the Custom Integrated Circuits Conference, Boston, May 13-16, 1990. No. Conf. 12, 13-16 May 1990, Institute of Electrical and Electronics Engineers, pp. 1211-1215, XP 000167683 K. Nagaraj "CMOS Amplifiers Incorporating a Novel Slew Rate Enhancement Technique".
Gershon Eugen
Hwang Chien-Meen
Advanced Micro Devices , Inc.
Chaikin Douglas A.
Mullins James B.
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