A 120dB all CMOS variable gain amplifier based on new exponential equation

This paper presents the design of a two-stage wide dynamic range variable gain amplifier (VGA). This is based on a new approximated exponential equation which offers a wide decibel linear range and an improved fully differential MOS Cherry-Hooper topology. In addition, the bandwidth of the VGA has b...

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Hauptverfasser:	Sheikhhosseini, Farhad, Nabavi, Abdolreza
Format:	Tagungsbericht
Sprache:	eng
Schlagworte:	Approximation methods Bandwidth Cherry-Hooper amplifier CMOS integrated circuits Computer architecture control function current squarer dB-linear characteristics Gain Microprocessors Transistors Variable gain amplifier (VGA)
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creator	Sheikhhosseini, Farhad Nabavi, Abdolreza
description	This paper presents the design of a two-stage wide dynamic range variable gain amplifier (VGA). This is based on a new approximated exponential equation which offers a wide decibel linear range and an improved fully differential MOS Cherry-Hooper topology. In addition, the bandwidth of the VGA has been extended by using the capacitive neutralization technique for wide-band applications. Simulation results based on a 0.13-μm CMOS technology demonstrate that the gain variation range of the VGA is 120dB (from -79 ~ 41 dB) when control voltage changes from -0.8V to 0.8V. The -3dB bandwidth of the VGA at the maximum gain is 132MHz and the overall current consumption is 3.34mA if the V dd =1.2V and the V ss =-1.2V.
doi_str_mv	10.1109/APCCAS.2010.5774738
format	Conference Proceeding
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This is based on a new approximated exponential equation which offers a wide decibel linear range and an improved fully differential MOS Cherry-Hooper topology. In addition, the bandwidth of the VGA has been extended by using the capacitive neutralization technique for wide-band applications. Simulation results based on a 0.13-μm CMOS technology demonstrate that the gain variation range of the VGA is 120dB (from -79 ~ 41 dB) when control voltage changes from -0.8V to 0.8V. The -3dB bandwidth of the VGA at the maximum gain is 132MHz and the overall current consumption is 3.34mA if the V dd =1.2V and the V ss =-1.2V.</abstract><pub>IEEE</pub><doi>10.1109/APCCAS.2010.5774738</doi><tpages>4</tpages></addata></record>
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subjects	Approximation methods Bandwidth Cherry-Hooper amplifier CMOS integrated circuits Computer architecture control function current squarer dB-linear characteristics Gain Microprocessors Transistors Variable gain amplifier (VGA)
title	A 120dB all CMOS variable gain amplifier based on new exponential equation
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