An Ultra-Low Power Fast Transient LDO with Dynamic Bias by Kun Liu, Yaoming Xie, Xiaoran Li, Lei Zhang

“…Meanwhile, a dynamic bias circuit which can regulate the operating current of error amplifier is proposed by monitoring output voltage variation in order to provide a larger compensation current to the operational amplifier when the load current changes are at high frequency and maintain ultra-low operating current at low clock frequency. …”
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High-Accuracy, Compact Scanning Method and Circuit for Resistive Sensor Arrays by Jong-Seok Kim, Dae-Yong Kwon, Byong-Deok Choi

“…The other type is a row driver composed of operational amplifiers. It, very accurately, reads the sensor resistance, but it uses a large number of operational amplifiers to drive rows of the sensor array; therefore, it severely increases the power consumption, cost, and system complexity. …”
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Precision Design and Fabrication of Noise-free High-Frequency Amplifier Board for Enhanced Signal Processing by Narvekar Sonal, Sharma Kadambari

“…It has also counted on the issues of electromagnetic interference, power supply decoupling, noise, and high-speed operational amplifier. The proposed system resulted in suitable amplification of low amplitude high-frequency electrical signal, having no signal cross-talks, electromagnetic interference, signal ringing, signal reflections, and posed larger bandwidth. …”
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Battery-Less NFC Potentiostat for Electrochemical Point-of-Care Sensors Based on COTS Components by Antonio Lazaro, Ramon Villarino, Marc Lazaro, Nicolau Canellas, Beatriz Prieto-Simon, David Girbau

“…A design based on an NFC microchip, a microcontroller, and a custom potentiostat based on an operational amplifier is presented. A proof-of-concept prototype has been designed and used to quantify glucose concentration using commercial glucose test strips from chronoamperometry measurements. …”
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Analysis and Calibration of Sources of Electronic Error in PSD Sensor Response by David Rodríguez-Navarro, José Luis Lázaro-Galilea, Ignacio Bravo-Muñoz, Alfredo Gardel-Vicente, Georgios Tsirigotis

“…A simple calibration method is proposed, which considers PSD response, component tolerances, temperature variations, signal frequency used, signal to noise ratio (SNR), suboptimal operational amplifier parameters, and analog to digital converter (ADC) quantitation SNRQ, etc. …”
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A 180 nm Self-biased Bandgap Reference with High PSRR Enhancement by Yue Shi, Shilei Li, Jianwen Cao, Zekun Zhou, Weiwei Ling

“…Abstract In this paper, an improved self-biased bandgap reference (BGR) with high power supply rejection ratio (PSRR) is presented. An operational amplifier constructing feedback loop is multiplexed with the generation of positive temperature coefficient (TC) voltage for lower power consumption, where an offset voltage is adopted to achieve proportional to absolute temperature (PTAT) voltage. …”
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Consumer Document Analytical Accelerator Hardware by Aswani Radhakrishnan, Dibyasha Mahapatra, Alex James

“…The number of matching scores for the TF and IDF values was implemented using operational amplifier-based comparator accumulator circuits. …”
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A CMOS analog driver for high-resolution display dedicated to portable applications by He, Zhenbo

“…In this project, a low-voltage four-stage operational amplifier that provides a feasible solution called Nested Cross Feedforward Miller RC Compensation (NCFMRC) technique for realizing high-resolution driver functions for portable applications in TSMC 40nm CMOS technology is proposed. …”
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A micropower nanowire interface circuit with sustainable performance by Qu, Yi.

“…Meanwhile, with other temperature and process variation compensation techniques on the proposed design such as temperature compensated transconductance of the operational amplifier input transistors in the V-I Converter and switch leakage compensation technique, error brought to the converted frequency of the system is minimized under wide temperature range and various processes. …”
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Design and development of a data acquisition and monitoring system by Su, Myat Nandar.

“…There are three sub modules in current sensing part: 1) current sensor module, 2) operational amplifier module, and 3) rectifier module. Similarly, voltage measurement has three sub modules 1) voltage transducer module, 2) low pass filter module and 3) bridge rectifier module. …”
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Design of a CMOS class AB op amp by Song, Xinze

“…A CMOS Class AB operational amplifier is the best option to meet the low power consumption and high-efficiency requirements. …”
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Low Cost front-end readout electronic for instrumentation used in Neutron experiments. by Lombigit, Lojius, Hamidon, Mohd Nizar, Khalid, Mohd Ashhar, Sulaiman, Nasri

“…This FER was built entirely with low-noise FET-input operational amplifier (Op-amp) and passive components. The development cost is around U.S. $50/channel. …”
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An Improved Dual-Gate Compact Model for Carbon Nanotube Field Effect Transistors with a Back-Gate Effect and Circuit Implementation by Zhifeng Chen, Yuyan Zhang, Jianhua Jiang, Chengying Chen

“…Finally, based on the compact model, an operational amplifier is designed to verify its correctness and feasibility in analog integrated circuits. …”
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Development of an Optoelectronic Integrated Sensor for a MEMS Mirror-Based Active Structured Light System by Xiang Cheng, Shun Xu, Yan Liu, Yingchao Cao, Huikai Xie, Jinhui Ye

“…The optoelectronic integrated sensor consists of a large-area photodetector (PD) and a receiving circuit, including a post amplifier, an operational amplifier, a bandgap reference, and a reference current circuit. …”
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A Survey on Current-Mode Interfaces for Bio Signals and Sensors by Massimo Scarsella, Gianluca Barile, Vincenzo Stornelli, Leila Safari, Giuseppe Ferri

“…The CCII is the most known current-mode active block, able to overcome some of the limitations of the classical operational amplifier, which provides an output current instead of a voltage. …”
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A 1.1 V 25 ppm/°C Relaxation Oscillator with 0.045%/V Line Sensitivity for Low Power Applications by Yizhuo Liao, Pak Kwong Chan

“…The oscillator includes a stable two-transistor based voltage reference without an operational amplifier, a simple current reference employing the temperature-compensated composite resistor, and the approximated complementary to absolute temperature (CTAT) delay-based comparators compensate for the approximated proportional to absolute temperature (PTAT) delay arising from the leakage currents in the switches. …”
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Design and Implementation of Active Noise Cancellation for Car Cabin on Sulaimania Roads Using Arduino Embedded System by Aven Rawf Hamza, Mohammed Abdullah Hussein Shiekh

“…It is called Active Noise Cancellation and can be done using analog or digital electronics. An operational amplifier and filters are used for the analog one, and in the digital one, signal processor chips are used. …”
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Noise Analysis in Pre-Amplifier Circuits Associated to Highly Sensitive Optically-Pumped Magnetometers for Geomagnetic Applications by Leisong Liu, Yuantian Lu, Xin Zhuang, Qunying Zhang, Guangyou Fang

“…This paper analyzes the noise sources in photoelectric detection circuits with several low-noise operational amplifiers cores. The fabricated circuits are low-noise pre-amplifiers that are used for optically pumped magnetometers. …”
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Low‐power 10‐bit 100 MS/s pipelined ADC in digital CMOS technology by Anil Singh, Veena Rawat, Alpana Agarwal

“…The internal gain of value 2 of the intermediate stages is achieved by using a charge‐pump‐based concept that avoids the use of power‐area inefficient operational amplifier. All the capacitors are realised by capacitors implemented by metal–oxide–semiconductor field‐effect transistors (MOSCAPs) that allows easy integration with any inexpensive standard digital CMOS technology, and altogether giving low area‐power‐cost solution. …”
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A Study of New Pulse Auscultation System by Ying-Yun Chen, Rong-Seng Chang

“…This study also presents a novel circuit design using an active filtering method. An operational amplifier with its differential features eliminates the interference from external signals, including the instant high-frequency noise. …”
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