A Switched-Capacitor Low-Pass Filter with Multiple-Channel Double-DSB OP Amplifiers

Wakaumi, Hiroo

doi:10.1109/iceic51217.2021.9369814

Cited by 3 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Switched capacitor circuits work by transporting charge with switches and capacitors instead of resistors, thereby avoiding difficult-to-integrate resistors in integrated circuits [2][3][4]. The SC circuit has many good characteristics such as high precision time constant, good voltage linearity, good temperature characteristic, compatible CMOS process, so it has been widely implemented in many vital parts of analog circuit such as pipeline Analog to Digital Converter (ADC), DC-DC converter, Switched capacitor filter [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A design of fully differential operational amplifier for switched-capacitor application

Niu

2023

HSET

View full text Add to dashboard Cite

Switched-capacitor (SC) circuit is used widely in communication and signal processing systems, such as switched-capacitor filter and switched-capacitor integrator. This paper proposes a fully differential operational amplifier for switched-capacitor application. The designed amplifier comprises common mode feedback circuit, auxiliary amplifier and main amplifier using fold cascode structure and its biasing circuit. The supply voltage VDD is 1V and VSS is -1V. After the simulation using TSMC 0.18μm process model, the simulation result shows the proposed amplifier achieve about 100.6dB DC gain, 66 degree phase margin,333 MHz unit gain bandwidth, 3.78V differential output swing, 287V/μs slew rate,122.8 dB DC PSRR, 114 dB DC CMRR, 1.6mW power consumption, the input reference noise is about 6nV/√Hz at 1MHz, the Total Harmonic Distortion of this amplifier is less than about 1.05%.The proposed fully differential operation amplifier meet all the specification, and it can be used in some SC circuit applications.

show abstract