A low power and low distortion rail-to-rail input/output amplifier using constant current technique

A rail-to-rail amplifier with constant transconductance, intended for audio processing, is presented. The constant transconductance is obtained by a constant current technique based on the input differential pairs operating in the weak inversion region. MOSFETs working in the weak inversion region h...

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Bibliographic Details
Published inJournal of semiconductors Vol. 32; no. 4; pp. 045003 - 1-4
Main Authors Liu, Yan (彦刘), Zhao, Yiqiang (毅强 赵), Zhang, Shilin (世林 张), Zhao, Hongliang (宏亮 赵)
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.04.2011
Subjects
Amplifiers
Distortion
Harmonic distortion
Inversions
MOSFETs
Semiconductors
Transconductance
Voltage
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ISSN1674-4926
DOI10.1088/1674-4926/32/4/045003

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Summary:A rail-to-rail amplifier with constant transconductance, intended for audio processing, is presented. The constant transconductance is obtained by a constant current technique based on the input differential pairs operating in the weak inversion region. MOSFETs working in the weak inversion region have the advantages of low power and low distortion. The proposed rail-to-rail amplifier, fabricated in a standard 0.35 mu m CMOS process, occupies a core die area of 75 x 183 mu m super(2). Measured results show that the maximum power consumption is 85.37 mu W with a supply voltage of 3.3 V and the total harmonic distortion level is 1.2% at 2 kHz.
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ISSN:1674-4926
DOI:10.1088/1674-4926/32/4/045003