Design of high speed 2-stage OTA for high capacitive load of 120 pF and 2.96 V

Ghatikar, Rohit S; Nithin, M.

doi:10.1088/2631-8695/ac3fbc

Cited by 1 publication

(1 citation statement)

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“…To achieve high gain, these interferences should be avoided. A behavioral representation of an Operational Transconductance Amplifier provides high gain, high stability, low noise, and high speed while devouring minimum power consumption [25][26][27]. The proposed OTA is analyzed in a differential mode and will overcome the issues of noise and the number of devices on a chip.…”

Section: Introductionmentioning

confidence: 99%

Analyzing A High Gain, Low Power OTA for Biomedical applications in 180 nm CMOS Technology

Kumar

Scholar

2022

Preprint

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As biopotential signals are having very small frequency variations tens of Hz and micro to millivolts amplitude in the range. While acquiring biopotential signals from a human body, intrusions occur in the acquisition system. Thus for acquiring noise-free signals, the enhanced Biopotential Acquisition unit having a high gain with an improved common-mode rejection ratio readout front-end is designed. To solve mentioned issues, a Fully Differential Two-Stage OTA is introduced in this paper to achieve high DC gain and high Unity-gain frequency. Operational Transconductance Amplifier operates at ± 0.2 V supply voltage, the bias current of 20µA, and achieves a high gain of 74dB. The design comprises a frequency compensation structure by connecting a capacitor across a high voltage stage and the load capacitor is connected across output by following the relation of CC > 0.22 CL. The proposed high gain stage achieves additional gain with reduced noise of 0.2 mV/\(\sqrt{\text{H}\text{z}}\) with a minimal power consumption of 1.9 nW. The analog readout front-end is executed using 180 nm CMOS Technology and utilizes less power, making it ideal for battery-powered devices in Biopotential Acquisition systems.

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Section: Introductionmentioning

confidence: 99%