A fourth order, low power sigma-delta modulator (SDM) with dynamic range (DR) extend technique is presented. The SDM was implemented as a sensing circuit for hearing aids systems instead of the traditional complex analog front end (AFE). The wide dynamic range sigma delta modulator (WDSDM) is implemented with a feed-forward architecture, order of 4, oversampling ratio (OSR) of 32, and an 1-bit quantizer under a sampling frequency of 1.44 MHz. The TSMC 0.18 μm 1P6M CMOS process is employed. Without the DR extended technique, the measured signal-to-noise distortion ratio (SNDR) and DR are 63.5 dB and 75 dB, respectively. By applying the DR extended technique, the measured DR can be extended to 88dB and its power consumption is 49.5 μW under the supply voltage of 1.8V.
|出版狀態||Published - 2013 五月 27|
|事件||2013 IEEE International Symposium on Next-Generation Electronics, ISNE 2013 - Kaohsiung, Taiwan|
持續時間: 2013 二月 25 → 2013 二月 26
|Other||2013 IEEE International Symposium on Next-Generation Electronics, ISNE 2013|
|期間||13-02-25 → 13-02-26|
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