Electronically tunable MOSFET-based resistor used in a variable gain amplifier or filter

Electronically tunable MOSFET-based resistor used in a variable gain amplifier or filter

We present a new design of an electronically tunable linear MOS resistor circuit that operates in the subthreshold saturation region, supported with mathematical derivations and simulation results using CSM0.13μm technology. For a given potential difference across the MOS resistor, its gate voltage...

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Bibliographic Details
Main Authors: Tan, Wei Lin, Chang, Chip Hong, Siek, Liter
Other Authors: School of Electrical and Electronic Engineering
Format: Conference or Workshop Item
Language:English
Published: 2021
Subjects:
Engineering::Electrical and electronic engineering
Linearise Subthreshold Current
Electronically Tunable Linear Resistor
Automatic Biasing
MOS Resistor
Online Access:https://hdl.handle.net/10356/152167
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Institution: Nanyang Technological University
Language: English
Description
Summary:We present a new design of an electronically tunable linear MOS resistor circuit that operates in the subthreshold saturation region, supported with mathematical derivations and simulation results using CSM0.13μm technology. For a given potential difference across the MOS resistor, its gate voltage will be automatically biased through feedback to provide the correct amount of current based on the desired resistance set through the bias current. In comparison with an existing design [1], the proposed design offers equal tunabilty with 36 less transistors for unidirectional current and 28 less transistors with one more bias current transistor for bidirectional current. A bias current ranging between 10nA to 100nA offers a tunable linear resistance between 20MΩ to 140MΩ.

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