A 1.1 V 25 ppm/°C relaxation oscillator with 0.045%/V line sensitivity for low power applications by Liao, Yizhuo, Chan, Pak Kwong

“…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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Gain-enhanced feedforward path compensation technique for pole–zero cancellation at heavy capacitive loads by Chan, Pak Kwong, Chen, Y. C.

“…The technique has been confirmed by the experimental results. An operational amplifier has been designed to drive a capacitive load of 300 pF. …”
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On the Performance of an Aerosol Electrometer with Enhanced Detection Limit by Yixin Yang, Tongzhu Yu, Jiaoshi Zhang, Jian Wang, Wenyu Wang, Huaqiao Gui, Jianguo Liu

“…The model showed that the noise was a function of ambient temperature, and it was affected by the characteristics of feedback resistor and operational amplifier simultaneously. The Faraday cup structure of the aerosol electrometer was optimized by adopting a newly designed cup-shaped metal filter which increased the surface area of the cup; thus the particle interception efficiency was improved. …”
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The Design of a Low Noise and Low Power Current Readout Circuit for Sub-pA Current Detection Based on Charge Distribution Model by Dahai Jiang, Qinan Chen, Zheng Li, Qiang Shan, Zihui Wei, Jinjin Xiao, Shuilong Huang

“…The changes in the load state of the amplifier under different operating conditions and the influence of the gain of the operational amplifier (Opamp) on the trans-impedance gain are analyzed to improve the design theory of switched-capacitor trans-impedance amplifiers. …”
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Analysis, Simulation, and Development of a Low-Cost Fully Active-Electrode Bioimpedance Measurement Module by Christos Dimas, Vassilis Alimisis, Ioannis Georgakopoulos, Nikolaos Voudoukis, Nikolaos Uzunoglu, Paul P. Sotiriadis

“…A comparison study between four selected operational amplifiers (ADA4622, OPA2210, AD8034, and AD8672) is additionally performed. …”
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A 54 µW CMOS Auto-Trimming Bandgap References (ATBGR) Achieving 90 dB PSRR for Artificial Intelligence of Things (AIoT) Chips by Balamahesn Poongan, Jagadheswaran Rajendran, Selvakumar Mariappan, Arvind Singh Rawat, Narendra Kumar, Arokia Nathan, Binboga S. Yarman

“…The reference voltage, <i>V</i>_REF, is compared to an external constant value, 1.25 V, through an operational amplifier, and the output of the de-multiplexer is used to configure the PMOS switches. …”
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A CMOS PSR enhancer with 87.3 mV PVT-insensitive dropout voltage for sensor circuits by Zhang, Jianyu, Chan, Pak Kwong

“…Due to simplicity without voltage reference and operational amplifier(s), low power and small consumption of supply voltage headroom, the proposed work is very useful for supply noise sensitive analog or sensor circuit applications.…”
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Design of chopper-stabilized amplifiers with reduced offset for sensor applications by Cui, J., Chan, Pak Kwong

“…A new resistance balancing circuit technique is also introduced, which permits further reduction of dc offsets in conventional chopping operational amplifier (op-amp) or chopping differential difference amplifier (DDA). …”
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Embedded mini-analyzer device for in situ wide range heavy metal identification and concentration detection by Mazaheri, Amin

“…This potentiostat is designed with a fully differential operational amplifier and rail-to-rail common-mode range buffer for linearity of output signal. …”
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Performance evaluation of single-stage differential amplifier based on carbon nanotube by Voon, Vivian Li Sin

“…Differential amplifier circuit topology is applied in this research because it is a very useful operational amplifier circuit to examine the performance differences between carbon nanotube and conventional silicon when they are used as channel material by evaluating Common-Mode Rejection Ratio (CMRR) of differential amplifier. …”
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An 8-bit 200-MSample/s pipelined ADC with mixed-mode front-end S/H circuit by Jiang, Shan, Do, Manh Anh, Yeo, Kiat Seng, Lim, Wei Meng

“…The reduction of signal swings relaxes the operational amplifier (opamp) gain, slew rate, bandwidth, and capacitor-matching requirements in pipelined ADCs. …”
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Design of CMOS potentiostat for low-concentration heavy metal detection by Raeisinafchi, Mehran

“…By using dTo ensure the linearity of output signal, the potentiostat is designed using fully differential operational amplifier and rail-to-rail common-mode range buffer. …”
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Classification of ankle joint movements based on surface electromyography signals by Al-Quraishi, Maged Saleh Saeed

“…In this part four EMG channels were implemented using instrumentation amplifier (INA114) for pre-amplification stage then the amplified signal was filtered using band pass filter to eliminate the unwanted signals. Operational amplifier (OPA2604) was involved for the main amplification stage to get the output signal in volts. …”
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CMOS low noise analog front-end design for multi-lead non-contact electrocardiogram by Chung, Wei Hong

“…From the simulation result, the CMOS operational amplifier design achieved the gain of 64.2286 dB and phase margin of 83.3°. …”
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Development of S-PWM voltage source inverter for induction motor drives by Siti Nursyuhada, Mahsahirun

“…A 3-phase sinusoidal waves, a Centre-aligned triangle wave, 3-phase S-PWM comparator modules are implemented with operational amplifier circuit configurations of specific ICs. …”
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A Fast Interface Circuit for the Measurement of 10 Ω to 1 GΩ Resistance by Yongkai Ning, Jiangfei Guo, Yangchen Jia, Duosheng Li, Guiliang Guo

“…In order to ensure that the current mirror can be copied accurately, this work uses a negative feedback structure consisting of an operational amplifier and an NMOS tube to ensure that the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi mathvariant="normal">V</mi><mi>DS</mi></msub></semantics></math></inline-formula> of the current mirroring tube remains consistent. …”
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On-Line Detection Method and Device for Moisture Content Measurement of Bales in a Square Baler by Huaiyu Liu, Zhijun Meng, Anqi Zhang, Yue Cong, Xiaofei An, Weiqiang Fu, Guangwei Wu, Yanxin Yin, Chengqian Jin

“…Aiming to address the problems of low detection accuracy and poor stability due to the weak anti-interference ability of the bridge circuit and operational amplifier circuit, and the influence on the capacitance of the bulk density and temperature of the straw bale, an on-line detection device for the moisture content of straw bales in a square baler was developed based on the capacitance method. …”
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Digital Calibration of Input Offset Voltage and Its Implementation in FDDA Circuits by David Maljar, Michal Sovcik, Miroslav Potocny, Robert Ondica, Daniel Arbet, Viera Stopjakova

“…Then, the principle and overall design of the calibration subcircuit, which was generally used to calibrate the input offset voltage <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>V</mi><mrow><mi>I</mi><mi>N</mi><mo>_</mo><mi>O</mi><mi>F</mi><mi>F</mi></mrow></msub></semantics></math></inline-formula> of the operational amplifier (OPAMP). The essence of this work is verification of the proposed digital calibration algorithm for minimization the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>V</mi><mrow><mi>I</mi><mi>N</mi><mo>_</mo><mi>O</mi><mi>F</mi><mi>F</mi></mrow></msub></semantics></math></inline-formula> of a bulk-driven fully differential difference amplifier (FDDA) with the power supply voltage <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>V</mi><mrow><mi>D</mi><mi>D</mi></mrow></msub></semantics></math></inline-formula> = 0.4 V. …”
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Broadband acoustic energy harvesting via synthesized electrical loading by Monroe, Nathan M

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Synthetic analog feedback control circuits in living cells by Teo, Jonathan Jin Yuan.

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