Low-Voltage, Wide-Common-Mode-Range and High-CMRR CMOS OTA

Hisashi TANAKA
Koichi TÁNNO
Ryota MIWA

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E93-A    No.5    pp.936-941
Publication Date: 2010/05/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E93.A.936
Print ISSN: 0916-8508
Type of Manuscript: PAPER
Category: Analog Signal Processing
weak inversion region,  voltage-to-current converter,  low-voltage,  low-power,  high-linearity,  

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In this paper, a low-voltage, wide-common-mode-range and high-CMRR OTA is presented. The proposed OTA consists of two circuit blocks; one is the input stage and operates as a differential level shifter, and the other is a highly linear output stage. Furthermore, the OTA can be operated in both weak and strong inversion regions. The proposed OTA is evaluated through Star-HSPICE with 0.18 µm CMOS device parameters (LEVEL53). Simulation results demonstrate a CMRR of 158 dB, a common-mode-input-range of 65 mV to 720 mV and a current consumption of 1.2 µA when VDD=0.8 V.