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Design of Adaptive Amplifiers with DC Varying Inputs

Title:

Design of Adaptive Amplifiers with DC Varying Inputs

Leduc, Pascal (2012) Design of Adaptive Amplifiers with DC Varying Inputs. Masters thesis, Concordia University.

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Abstract

Analog amplifiers are one of the most commonly used building blocks in electronic systems. Emerging circuit technologies create new systems and also new applications for signal amplification. A conventional amplifier operates at a fixed biasing point to transfer signals varying on a fixed DC level with a constant or variable gain. In some new systems, particularly those involving sensors, the DC component of a signal to be amplified can be variable, instead of fixed. The established design procedure is not applicable for such signals.

In this thesis, a design method for adaptive amplifiers is proposed. It is to design an amplifier that can adjust itself automatically to suit the DC level of the input voltage and the amplification gain is variable according to the input DC level. The amplifier is made to perform, from a small signal point view, a linear amplification with a fixed gain, but from a large signal point view, a nonlinear voltage transfer. The nonlinear character of its function makes the amplifier capable of operating with an input voltage of which the DC level can vary in a specified range and providing a gain adapting to the input DC level.

The proposed method has been used to design an amplifier for a voltage signal enhancement in a wide dynamic range current-to-voltage conversion circuit. The designed amplifier has four cascading stages, i.e., three simple common source amplifier stages and one source follower. The units are tuned to perform a nonlinear voltage transfer while keeping a local linearity. These units are combined to implement the characteristics needed for the signal enhancement. The circuit has been simulated and the results demonstrated that it is able to perform the required amplification of the signal varying on different DC levels with an input-dependent gain.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering
Item Type:Thesis (Masters)
Authors:Leduc, Pascal
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Electrical and Computer Engineering
Date:August 2012
Thesis Supervisor(s):Wang, Chunyan
Keywords:Adaptive amplifier, Variable gain amplifier, DC varying input, non-linear amplifier
ID Code:974795
Deposited By: PASCAL LEDUC
Deposited On:06 Jun 2013 19:41
Last Modified:18 Jan 2018 17:39

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