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

Hisashi TANAKA; Koichi TANNO; Ryota MIWA; Hiroki TAMURA; Kenji MURAO

doi:10.1587/transfun.E93.A.936

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

Hisashi TANAKA, Koichi TANNO, Ryota MIWA, Hiroki TAMURA, Kenji MURAO

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Keywords: weak inversion region, voltage-to-current converter, low-voltage, low-power, high-linearity

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Volume E93.A (2010) Issue 5 Pages 936-941

DOI https://doi.org/10.1587/transfun.E93.A.936

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Abstract

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 0.18µm CMOS device parameters (LEVEL53). Simulation results demonstrate a CMRR of 158dB, a common-mode-input-range of 65mV to 720mV and a current consumption of 1.2µA when V_DD=0.8V.

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