On the design of highly linear CMOS digitally programmable operational transconductance amplifiers for low and high-frequency applications

This paper proposes a novel highly linear digitally programmable fully differential operational transconductance amplifier (DPOTA) circuit. Two versions of the proposed DPOTA structure are designed. The first version is optimized for high-frequency operation with current division networks designated...

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Bibliographic Details
Published inAnalog integrated circuits and signal processing Vol. 97; no. 2; pp. 225 - 241
Main Authors Elamien, Mohamed B., Mahmoud, Soliman A.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.11.2018
Springer Nature B.V
Subjects
Circuit design
Circuits and Systems
CMOS
Computer simulation
Electric potential
Electrical Engineering
Engineering
Harmonic distortion
Operational amplifiers
Signal,Image and Speech Processing
Transconductance
CMOS transconductor
CDN
DPOTA
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Summary:This paper proposes a novel highly linear digitally programmable fully differential operational transconductance amplifier (DPOTA) circuit. Two versions of the proposed DPOTA structure are designed. The first version is optimized for high-frequency operation with current division networks designated to 3-bit control code words. On the other hand, the second version is optimized for low-frequency operation with 4-bit control code words. The third-order harmonic distortion (HD3) of the first DPOTA version remains below − 66 dB up to 0.4 V differential input voltage at 10 MHz frequency. The second DPOTA version achieved HD3 of − 70 dB with an amplitude of 20 mV p – p and at 100 Hz frequency. The proposed circuits are designed and simulated in 90 nm CMOS model, BSIM4 (level 54) under a balanced 1.2 V supply voltage.
ISSN:0925-1030
1573-1979
DOI:10.1007/s10470-018-1128-2