Robust highly linear high-frequency CMOS OTA with IM3 below - 70 dB at 26 MHz

An enhanced configuration for a linearized MOS operational transconductance amplifier (OTA) is proposed. The proposed fully differential OTA circuit is based on resistive source degeneration and an improved adaptive biasing technique. It is robust to process variation, which has not been fully shown...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 1, Fundamental theory and applications Fundamental theory and applications, 2006-07, Vol.53 (7), p.1433-1447
Main Authors: Wenchang Huang, Wenchang Huang, Sanchez-Sinencio, E
Format: Article
Language:English
Subjects:
Amplifiers
Circuits
CMOS
CMOS technology
continuous-time filters
Density
Electric potential
Harmonic analysis
Harmonic distortion
Intermodulation
Linearization techniques
Linearized operational transconductance amplifier (OTA)
Low pass filters
MOS transconductors
Noise levels
Operational amplifiers
OTA-C filter
Power harmonic filters
Robustness
Studies
Transconductance
Tunable circuits and devices
Volterra series
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Summary:An enhanced configuration for a linearized MOS operational transconductance amplifier (OTA) is proposed. The proposed fully differential OTA circuit is based on resistive source degeneration and an improved adaptive biasing technique. It is robust to process variation, which has not been fully shown in previously reported linearization techniques. Detailed harmonic distortion analysis demonstrating the robustness of the proposed OTA is introduced. The transconductance gain is tunable from 160 to 340 /spl mu/S with a third-order intermodulation (IM3) below -70 dB at 26 MHz. As an application, a 26-MHz second-order low-pass filter fabricated in TSMC 0.35-/spl mu/m CMOS technology with a power supply of 3.3 V is presented. The measured IM3 with an input voltage of 1.4 Vpp is below - 65 dB for the entire filter pass-band, and the input referred noise density is 156nV//spl radic/Hz. The cutoff frequency of the filter is tunable in the range of 13-26 MHz. Theoretical and experimental results are in good agreement.
ISSN:1549-8328
1057-7122
1558-0806
DOI:10.1109/TCSI.2006.875187