Publication

An automatic offset compensation technique applicable to existing operational amplifier core cell

Maher Kayal
1998
Conference Papers

Abstract

An automatic offset compensation scheme for 2 stages operational amplifier is described. The presented technique can be applied to an existing OA core cell without modifying its design. Offset voltage is reduced by digitally adjusting the resulting offset current at the node between the first and second OA stages. A background calibration is achieved by using a ping-pong structure that improves the temperature stability and an on-demand calibration is also provided. The proposed circuit has been fabricated in a 0.7 mu m digital CMOS technology. The measured input offset voltage of the test circuits are less than +/-200 mu V.

Official source

https://infoscience.epfl.ch/entities/publication/6d986950-fb60-4594-879a-790daa8a2eed

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Maher Kayal
1998
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6d986950-fb60-4594-879a-790daa8a2eed

About this result

Related concepts (30)

Amplifier

An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current). It is a two-port electronic circuit that uses electric power from a power supply to increase the amplitude (magnitude of the voltage or current) of a signal applied to its input terminals, producing a proportionally greater amplitude signal at its output. The amount of amplification provided by an amplifier is measured by its gain: the ratio of output voltage, current, or power to input.

Operational amplifier

An operational amplifier (often op amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. In this configuration, an op amp produces an output potential (relative to circuit ground) that is typically 100,000 times larger than the potential difference between its input terminals. The operational amplifier traces its origin and name to analog computers, where they were used to perform mathematical operations in linear, non-linear, and frequency-dependent circuits.

Integrated circuit

An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of miniaturized transistors and other electronic components are integrated together on the chip. This results in circuits that are orders of magnitude smaller, faster, and less expensive than those constructed of discrete components, allowing a large transistor count.

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An automatic offset compensation technique applicable to existing operational amplifier core cell

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