本文介紹一個利用0.35μmCMOS製程製作，用於數位射頻助聽器，電流功耗0.39毫安培92dB動態範圍之切換式電容(SC)三階三角積分調變器(Delta-Sigma Modulator)設計。此調變器利用改良的迴授迴路架構，使其有效地實現了高動態範圍和低功耗之需求。為符合在0.35um製程中實現1.2V的電路，在電路設計上採用定柵源升壓開關(Bootstrapping Switch)和低電壓大範圍信號輸出的操作放大器(OTA)設計。測量結果顯示，此調變器在10kHz的頻寬與128的過取樣比(Oversampling Ratio)之下，可達90dB之SNR，同時在0.47mW的功耗下，具有555e-6的良好FOM。

A 0.39mA 92dB dynamic range Switch-Capacitor (SC) Third-Order Delta-Sigma modulator for a digital RF hearing aid in 0.35μm CMOS is presented here. A Modified-Feedback topology is used here that effectively achieves a high dynamic range and the low power consumption. In the implementation, the Bootstrapping- Switch and the Low-Voltage Wide-Swing OTA are essentially designed for 1.2V supply voltage with the 0.35um CMOS process. In the measurement result, this modulator achieves 90dB SNR in a 10-KHz bandwidth with an oversampling ratio of 128, and its power consumption is 0.47mW with a good FOM of 555e-6.