A 40-MHz Double Differential-Pair CMOS OTA With -} IM3

A configuration of a linearized operational transconductance amplifier (OTA) for low-voltage and high-frequency applications is proposed. By using double pseudodifferential pairs and the source-degeneration structure under nano-scale CMOS technology, the nonlinearity caused by short channel effect f...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. I, Regular papers Regular papers, 2008-01, Vol.55 (1), p.258-265
Main Authors: Lo, Tien-Yu, Hung, Chung-Chih
Format: Article
Language:English
Subjects:
Channels
CMOS
CMOS technology
Control systems
Distortion
Electric potential
Linearity
MOSFETs
Nanostructure
Nanostructures
Operational amplifiers
Operational transconductance amplifier (OTA)
pseudodifferential structure
Robust control
Robust stability
short channel effect
source degeneration
Transconductance
Tuning
Voltage
Voltage control
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Summary:A configuration of a linearized operational transconductance amplifier (OTA) for low-voltage and high-frequency applications is proposed. By using double pseudodifferential pairs and the source-degeneration structure under nano-scale CMOS technology, the nonlinearity caused by short channel effect from a small feature size can be minimized. A robust common-mode control system is designed for input and output common-mode stability and thus reduces distortion caused b y common-mode voltage variation. Tuning ability can be achieved by using MOS transistors in the linear region. The linearity of the OTA is about third-order inter-modulation (IM3) distortion for up to 0.9 at 40 MHz. This OTA was fabricated by the TSMC 180-nm deep n-well CMOS process. It occupies a small area of 15.1 x 10 -3 mm 2 and the power consumption is 9.5 mW under a 1.5-V supply voltage.
ISSN:1549-8328
1558-0806
DOI:10.1109/TCSI.2007.910747