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Third Order Continuous-Time Sigma-Delta Modulator with 1.5bit QuantizerKang, Ruei-Gen 30 August 2011 (has links)
The thesis proposes a third order continuous-time sigma delta modulator used in GSM. We used a special 1.5bit quantizer, and to use its three different states to reach a differential feedback path. That can improve the resolution of our circuit.
Oversampling and noise shaping are two keys of sigma delta modulator. In structure, the continuous-time features can reduce power consumption.
The proposed sigma delta modulator uses TSMC 0.35 m CMOS process and its sampling frequency is 10.8MHz, bandwidth is200KHz and oversampling ratio is 32.
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