NDLI: Low-power CMOS variable gain amplifier based on a novel tunable transconductor

Content Provider	IET Digital Library
Author	Rodríguez, Trinidad Sánchez Galán, Juan Antonio Pedro, Manuel Martín, Antonio J. López Carvajal, Ramon G. Angulo, Jaime Ramírez
Abstract	A CMOS variable gain amplifier (VGA) based on a novel linear and tunable triode transconductor is presented. The proposed transconductor employs local negative feedback for linearisation controlling the drain voltage of the input transistors biased in the triode region. The new design is able to operate at low supply voltage and the stability is guaranteed. The transconductor features a 47.75 dB dc gain and a 4.23 MHz unity gain frequency with a power consumption of only 91 µA. To show the feasibility of the proposed transconductor, a VGA has been fabricated. Measurement results for a 0.13 µm CMOS design show a −3 dB bandwidth above 2.8 MHz and a third-order harmonic distortion at 500 kHz below −46 dB over the whole gain range. The VGA exhibits a maximum power consumption of only 395 µW from a single 1.2 V supply.
Starting Page	105
Ending Page	110
Page Count	6
ISSN	1751858X
Volume Number	9
e-ISSN	17518598
Issue Number	Issue 2, Mar (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-cds/9/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-cds.2014.0130
Journal	IET Circuits, Devices & Systems
Publisher Date	2015-03-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplifiers Circuit Stability Circuit Tuning CMOS Analogue Integrated Circuit CMOS Integrated Circuit Current 91 MuA Feedback Amplifiers Frequency 4.23 MHz Frequency 500 KHz Gain 47.75 DB HF Amplifiers Input Triode Transistor Insulated Gate Field Effect Transistors Integrated Circuit Design Layout Linear Tunable Triode-operated Transconductor Linearisation Drain Voltage Control Linearisation Technique Low Power Electronics Low-power CMOS Variable Gain Amplifier Microwave IC Modelling And Testing MOSFET Negative Feedback Operational Amplifier Power 395 MuW Radiofrequency Amplifiers Radiofrequency Integrated Circuit Semiconductor Integrated Circuit Design Size 0.13 Mum Stability Third-order Harmonic Distortion Triodes Vacuum Tubes VGA Voltage 1.2 V Voltage Control
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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