IEEJ Transactions on Electronics, Information and Systems
Online ISSN : 1348-8155
Print ISSN : 0385-4221
ISSN-L : 0385-4221
Novel Low Voltage CMOS OTA's Using MOSFET's Operated in the Linear Region
Haruo YanariAkira HyogoEitake IbaragiKeitaro Sekine
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Keywords: OTA
JOURNAL FREE ACCESS

2000 Volume 120 Issue 10 Pages 1358-1364

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Abstract

An OTA is one of useful analog circuit blocks. In order to obtain a linear characteristic of OTA's transconductance, two MOSFET's operated in the linear region are used as input devices. The linearity of the OTA is achieved by fixing a drain-to-source voltage of the MOSFET's. A Current Transfer Voltage Regulated circuit (CTVR) is utilized to fix the drain-to-source voltage. An OTA using the CTVR realizes linear characteristic. The conventional CTVR has a problem of voltage error between the Gate-to-Sourse voltage of nMOSFET and pMOSFET In this paper, Low-Voltage OTA's are proposed. The proposed circuits use the CTVR without influence of voltage setting error. The proposed circuits are simulated by PSpice to confirm their performance.

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