Operational transconductance amplifier (OTA)

Details Operational transconductance amplifier (OTA) Operational transconductance amplifier (OTA)

2007-05-02

2009-06-02

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C323S315000

Reexamination Certificate

active

07541871

ABSTRACT:
Apparatus and methods provide an operational transconductance amplifier (OTA) with one or more self-biased cascode current mirrors. Applicable topologies include a current-mirror OTA and a folded-cascode OTA. In one embodiment, the self-biasing cascode current mirror is an optional aspect of the folded-cascode OTA. The self-biasing can advantageous reduce the number of biasing circuits used, which can save chip area and cost. One embodiment includes an input differential pair of a current-mirror OTA.

REFERENCES:
patent: 5412343 (1995-05-01), Rijns
patent: 5729178 (1998-03-01), Park et al.
patent: 5966005 (1999-10-01), Fujimori
patent: 6052025 (2000-04-01), Chang et al.
patent: 6169456 (2001-01-01), Pauls
patent: 6211659 (2001-04-01), Singh
patent: 7038538 (2006-05-01), Tran et al.
patent: 2004/0263251 (2004-12-01), Sugimura
patent: 2006/0139096 (2006-06-01), Zolfaghari
patent: 2006/0226893 (2006-10-01), Abel
patent: 0613072 (1994-08-01), None
patent: 0643347 (1995-03-01), None
patent: 1081573 (2001-03-01), None
patent: 11-150430 (1999-06-01), None
patent: WO 95/13653 (1995-05-01), None
patent: WO 01/69681 (2001-09-01), None
patent: WO 03/019771 (2003-03-01), None
Harjani, et al.; An Integrated Low-Voltage Class AB CMOS OTA; IEEE (Institute of Electrical and Electronics Engineers) Journal of Solid-State Circuits; Feb. 1999; pp. 134-142; vol. 34. No. 2; IEEE (Institute of Electrical and Electronics Engineers).
Castello, et al.; A 500-nA Sixth-Order Bandpass SC Filter; IEEE (Institute of Electrical and Electronics Engineers) Journal of Solid-State Circuits; Jun. 1990; pp. 669-676; vol. 25. No. 3; IEEE (Institute of Electrical and Electronics Engineers).
Tsividis, et al.; A Process-Insensitive High-Performance NMOS Operational Amplifier; IEEE (Institute of Electrical and Electronics Engineers) Journal of Solid-State Circuits; Dec. 1980; pp. 921-928; vol. SC-15, No. 6; IEEE (Institute of Electrical and Electronics Engineers).
Dessent, et al.; A Two-Stage Fully Differential Operational Transconductance Amplifier; EE240 Term Project Report; Spring 2001; University of California, Berkeley.
Lars Wanhammer; Comparison of Three Operational Transconductance Amplifiers; [online] [retrieved on Mar. 1, 2007] Retrieved from the Internet: <URL: www.tde.isy.liu.se/projects/AnalogCAD/design—cases/design—space—exploration/3—amplifiers.html>.
Lu, et al.; A CMOS Low-Voltage, High-Gain Op-Amp; European Design and Test Conference, 1997. ED&TC 97. Proceedings; Mar. 17-20, 2007; pp. 51-55; IEEE (Institute of Electrical and Electronics Engineers).
Lu, et al.; A CMOS Op Amp Using a Regulated-Cascode Transimpedance Building Block for High-Gain, Low-Voltage Achievement; 1997 IEEE (Institute of Electrical and Electronics Engineers) International Symposium on Circuits and Systems; Jun. 9-12, 1997; pp. 165-168; IEEE (Institute of Electrical and Electronics Engineers).
Mandal, et al; Active Biasing of Multistage CMOS Op-Amps for Performance Enhancement; International Journal of Electronics; 1999; pp. 933-946; vol. 86, No. 8; Taylor & Francis Ltd.

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