scholarly journals A Compact Operational Amplifier with Load-Insensitive Stability Compensation for High-Precision Transducer Interface

Sensors ◽  
2018 ◽  
Vol 18 (2) ◽  
pp. 393 ◽  
Author(s):  
Zhanghao Yu ◽  
Xi Yang ◽  
SungWon Chung
Keyword(s):  
High Precision ◽  
Operational Amplifier ◽  
Transducer Interface

scholarly journals Low-Noise Chopper-Stabilized Multi-Path Operational Amplifier with Nested Miller Compensation for High-Precision Sensors

2019 ◽  
Vol 10 (1) ◽  
pp. 281 ◽  
Author(s):  
Jaesung Kim ◽  
Hyungseup Kim ◽  
Kwonsang Han ◽  
Donggeun You ◽  
Hyunwoo Heo ◽  
...  
Keyword(s):  
High Precision ◽  
Operational Amplifier ◽  
High Frequency ◽  
Flicker Noise ◽  
Low Frequency ◽  
Low Noise ◽  
Cmos Process ◽  
Miller Compensation ◽  
Chopper Stabilization ◽  
Nested Miller Compensation

This paper presents a low-noise multi-path operational amplifier for high-precision sensors. A chopper stabilization technique is applied to the amplifier to remove offset and flicker noise. A ripple reduction loop (RRL) is designed to remove the ripple generated in the process of up-modulating the flicker noise and offset. To cancel the notch in the overall transfer function due to the RRL operation, a multi-path architecture using both a low-frequency path (LFP) and high-frequency path (HFP) is implemented. The low frequency path amplifier is implemented using the chopper technique and the RRL. In the high-frequency path amplifier, a class-AB output stage is implemented to improve the power efficiency. The transfer functions of the LFP and HFP induce a first-order frequency response in the system through nested Miller compensation. The low-noise multi-path amplifier was fabricated using a 0.18 µm 1P6M complementary metal-oxide-semiconductor (CMOS) process. The power consumption of the proposed low-noise operational amplifier is 0.174 mW with a 1.8 V supply and an active area of 1.18 mm2. The proposed low-noise amplifier has a unit gain bandwidth (UGBW) of 3.16 MHz, an input referred noise of 11.8 nV/√Hz, and a noise efficiency factor (NEF) of 4.46.

scholarly journals Error factors of AC-DC conversion circuits accuracy

2021 ◽  
Vol 2132 (1) ◽  
pp. 012039
Author(s):  
Dongyu Jia ◽  
Ming Yan ◽  
Rongwei Feng ◽  
Shuangyu Li
Keyword(s):  
High Precision ◽  
Operational Amplifier ◽  
Electrical Measurement ◽  
Output Function ◽  
Voltage Standard ◽  
Standard Source ◽  
Rectifier Circuit ◽  
Full Wave ◽  
Measurement And Testing ◽  
Testing Field

Abstract Voltage standard source is an important basic instrument in the electrical measurement and testing field, and it has important guarantee significance for many industries. AC voltage standard source is based on AC-DC conversion technology to achieve output function of high precision AC voltage. In order to get a better effect of AC-DC conversion, the three factors—operational amplifier, resistance and diode—that have a greater impact on the accuracy of the rectifier output were taken the research object, and their impacts on the circuit error were analyzed respectively. The output result was compared with the output of full wave precision rectification circuit under ideal state, and the scheme of reducing error in the precision rectifier circuit was summarized, which provides a reference for improving the accuracy of AC-DC conversion in the design of full wave rectifier circuit.

A high precision micropower operational amplifier

1979 ◽  
Vol 14 (6) ◽  
pp. 1048-1058 ◽  
Author(s):  
K. Fukahori ◽  
Y. Nishikawa ◽  
A.R. Hamade
Keyword(s):  
High Precision ◽  
Operational Amplifier
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