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    • A Low-Noise Multipath Operational Amplifier with Gm-shared Ping-Pong and Ripple Averaging Techniques

    Jihyang Wi,Gyuri Choi,Mookyoung Yoo,Sanggyun Kang,Byeongkwan Jin,Hyeoktae Son,Kyounghwan Kim,Gibae Nam,Hyoungho Ko

    MICROELECTRONICS JOURNAL（2024）

    Chungnam Natl Univ

    Cited 2|Views4
    Abstract
    This paper presents a low-noise chopper-stabilized multipath operational amplifier with transconductance (Gm) sharing technique between ping-pong stages and ripple averaging technique. While the chopper stabilization is effective in reducing low-frequency noise and offset, output signals may yet contain ripples caused by the modulated amplifier offset. Several schemes can be implemented to suppress these output ripples; however, they require additional chip area and current consumption. The proposed ripple averaging technique effectively eliminates chopper ripples with very low additional power consumption of switched capacitors. To reduce the power consumption and circuit area, the Gm-shared ping-pong scheme is also proposed. The proposed circuit was implemented using a 0.18-mu m CMOS process, with a total current consumption of 121.91 mu A, and a supply voltage of 1.8 V. It occupies a chip area of 0.33 mm2 and exhibits an input-referred offset of 4.833 mu V with a standard deviation 0.861 mu V. The proposed amplifier has the input-referred noise level of 20.1 nV/root Hz.
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    Key words
    Multipath operational amplifier,Chopper stabilization,Chopper ripple,Ripple averaging,G m -shared ping-pong
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