Linearity improvement of source degenerated transconductance amplifiers

被引：22

作者：

Kar, Sougata Kumar ^{[1
]}

Sen, Siddhartha ^{[1
]}

机构：

[1] Indian Inst Technol, Dept Elect Engn, Kharagpur 721302, W Bengal, India

来源：

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING | 2013年 / 74卷 / 02期

关键词：

PSEUDODIFFERENTIAL OTA; CMOS TRANSCONDUCTOR; HARMONIC-DISTORTION; DB; DESIGN;

D O I：

10.1007/s10470-012-9948-y

中图分类号：

TP3 [计算技术、计算机技术];

学科分类号：

0812 ;

摘要：

Mobility degradation is predominant in submicron CMOS technology. The effect of this mobility reduction in a linear operational transconductance amplifier (OTA) with signal attenuation and source degeneration is examined in this study. Theoretical analysis shows that the cubic non-linearity in the attenuator helps to improve the linearity of the source degenerated transconductor by partial cancellation of the harmonic distortion component. Such a linear transconductor and a third order low pass filter based on this linear OTA are fabricated in UMC 180 nm CMOS process technology. Experimental results show that third order intermodulation distortion of the linear OTA is less than -60 dB for 500 mVpp differential input signal while for 2 % transconductance variation the linear range is about 1.2 Vpp. The linear transconductor consumes only 0.45 mW of power with 1.8 V supply.

引用

页码：399 / 407

页数：9

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