淡江大學機構典藏:Item 987654321/127306
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    題名: A 6th Order Current- Mirror-Based Gm-C Bandpass Filter with the Binary Searching Calibration Scheme for Capacitor Sensing Applications
    作者: Hsin-Liang Chen, Hsiao-Hsing Chou, Chun-Kai Fu, Jen-Shiun Chiang
    關鍵詞: Current-mirror-based;Capacitive sensing;Bandpass filter;Transconductance-capacitor (Gm-C);Binary searching
    日期: 2025-03-10
    上傳時間: 2025-04-23 12:05:21 (UTC+8)
    摘要: This paper presents the current-mirror-based Gm-C bandpass filter with a digitally binary searching calibration scheme. The current-mirror-based circuit technique can be a highly regular structure, which drives the proposed filter to implement the conceptions of the modularized unit and repeatable layout. Furthermore, it employs a tunable bias current circuit and a successively counting logic to implement the binary searching calibration scheme to reduce the mass test timing budget and to obtain the correct frequency response. Thus, the proposed 6th-order current-mirror-based Gm-C bandpass filter can overcome the PVT variations with this automatically tunable bias scheme. Accordingly, a Gm-C LC oscillator, which forms the same unit cell as the filter, generates the oscillated clock for this digital successively counting calibration scheme. This work is designed and implemented in the 0.18 μm CMOS process with a supply voltage of 1.8 V. The specifications include the center frequency of 200 kHz and bandwidth of 100 kHz for capacitor sensing applications. The measured power dissipations of the filter and calibrating scheme are 0.65 mW and 0.56 mW, respectively. After calibrating, the mean offset and standard deviation ratios to the calibrated clock frequency are only 2.1% and 1.66%, respectively.
    關聯: Circuits Systems and Signal Processing
    DOI: 10.1007/s00034-025-03003-1
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