Publication

A Low Noise Amplifier with Automatic Gain Control and Anticlipping Control in CMOS Technology

Christian Enz
1992
Journal Articles

Abstract

A CMOS low-noise amplifier (LNA) with two variable gain ranges of 6 and 9 dB is presented. Variable gain is realized by using linearized MOS resistive circuits (MRCs) as voltage-controlled resistors. One of these resistors is located in the feedback loop of a transresistance output stage and the other is in the bias current generator of the transconductance input stage. Using compatible lateral bipolar transistors (CLBTs) in the fully differential transconductance input stage, the circuit takes advantage of the linear dependence of transconductance on bias current. The equivalent noise is 14 nV/√ Hz and free from 1/f noise in the voice band. The circuit was integrated in a 2-μm CMOS process and has an active area of 0.8 mm2.

Official source

https://infoscience.epfl.ch/entities/publication/e4aade6f-288a-4203-8bf3-87d184415468

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Christian Enz
1992
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e4aade6f-288a-4203-8bf3-87d184415468

About this result

Related concepts (32)

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.

Variable-gain amplifier

A variable-gain (VGA) or voltage-controlled amplifier (VCA) is an electronic amplifier that varies its gain depending on a control voltage (often abbreviated CV). VCAs have many applications, including audio level compression, synthesizers and amplitude modulation. A crude example is a typical inverting op-amp configuration with a light-dependent resistor (LDR) in the feedback loop. The gain of the amplifier then depends on the light falling on the LDR, which can be provided by an LED (an optocoupler).

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A Low Noise Amplifier with Automatic Gain Control and Anticlipping Control in CMOS Technology

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