An Integrated Wideband Operational Transconductance Amplifier with Complementary Slew-Rate Enhancer

Deng-Fong LU  Chin HSIA  Kun-Chu LEE  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E103-A   No.1   pp.295-296
Publication Date: 2020/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.2019WBL0003
Type of Manuscript: Special Section LETTER (Special Section on Wideband Systems)
Category: 
Keyword: 
wideband OTA,  low power,  slew-rate,  

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Summary: 
The paper presents a low power, wideband operational trans-conductance amplifier (OTA) for applications to drive large capacitive loads. In order to satisfy the low static power dissipation, high-speed, while reserving high current driving capability, the complementary slew-rate enhancer in conjunction with a dual class AB input stage to improve the slew-rate of a rail-to-rail two-stage OTA is proposed. The proposed architecture was implemented using 0.5µm CMOS process with a supply voltage of 5V. The slew-rate can achieve 68V/µsec at static power dissipation of 0.9mW, which can be used to efficiently drive larger than 6 nF capacitive load. The measured output has a total harmonic distortion of less than 5%.