High-gain, bulk-driven operational amplifiers for...

Details High-gain, bulk-driven operational amplifiers for... High-gain, bulk-driven operational amplifiers for...

2006-08-08

2006-08-08

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S255000

Reexamination Certificate

active

07088178

ABSTRACT:
An ultra-low voltage rail-to-rail operational transconductance amplifier (OTA) is based on a standard digital 0.18 μm CMOS process. Techniques for designing a 0.8 volt fully differential OTA include bias and reference current generator circuits. To achieve rail-to-rail operation, complementary input differential pairs are used, where the bulk-driven technique is applied to reduce the threshold limitation of the MOSFET transistors. The OTA gain is increased by using auxiliary gain boosting amplifiers.

REFERENCES:
patent: 6118341 (2000-09-01), Huijsing et al.
patent: 6366167 (2002-04-01), Stockstad
Veeravalli et al., “Transconductance Amplifier Structures with Very Small Transconductances: A Comparative Design Approach”, (IEE Journal of Solid-State Circuits, vol. 37, No. 6, Jun. 2002).
“A rail-to-Rail, Constant-Gm, 1-Volt CMOS Opamp”, F. Bahmani, et al., IEEE International Symposium on Circuits and Systems, May 28-31, 2000, Switzerland, pp. II-669-II-672.
“Low Voltage Analog Circuit Design Techniques: A Tutorial”, S. Yan, et al., IEICE Trans. Analogo Intergrated Circuits and Systems, vol. E00-A, No. 2, Feb. 2000, pp. 1-17.
“A 0.8 Volt High Performance OTA Using Bulk-Driven MOSFETs for Low Power Mixed-Signal SOCs”, J. Rosenfeld, et al., University of Rochester, Rochester, New York, pp. 245 and 246.

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