Chopper-Stabilized Low-Noise Multipath Operational Amplifier With Dual Ripple Rejection Loops

Hyungseup Kim, Kwonsang Han, Kim Js, Donggeun You, Hyunwoo Heo, Yongsu Kwon, Choul‐Young Kim, Hi‐Deok Lee, Hyoungho Ko

2020IEEE Transactions on Circuits & Systems II Express Briefs28 citationsDOI

Abstract

This brief presents a chopper-stabilized low-noise multipath operational amplifier with dual ripple rejection loops. The multipath amplifier scheme has a lower noise and a wider bandwidth than the conventional chopper amplifiers. The dual ripple rejection loops are proposed to effectively attenuate the offset and low-frequency noise components. The dual ripple rejection loops are implemented using a feedback low-pass filter (LPF) for AC coupling and a floating high-pass filter (HPF) for additional low-frequency rejection with a fast common mode response. The amplifier is fabricated using a 0.18-μm CMOS process with an active area of 4.92 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . The input referred noise level is 6.62 nV/√Hz, and the total current consumption is 117.2 μA with a 1.8 V power supply.

Topics & Concepts

RippleChopperAmplifierElectronic engineeringElectrical engineeringBandwidth (computing)Active noise controlLow-pass filterCMOSMultipath propagationComputer sciencePhysicsFilter (signal processing)EngineeringTelecommunicationsVoltageChannel (broadcasting)Analog and Mixed-Signal Circuit DesignRadio Frequency Integrated Circuit DesignAdvancements in PLL and VCO Technologies