The Design of Low Voltage, Low Power Delta Sigma Modulator for Pacemakers
| Autor: | Wu, Che-Wei, 吳哲瑋 |
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| Rok vydání: | 2011 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 99 In recent years, low power low voltage mixed-signal circuit design technologies have brought a considerable variety of portable, implantable battery-powered devices to the market. Due to the battery-operated and implantable specification, low power consumption and small physical size are the primary importance. Therefore, the low voltage circuit design is an inevitable trend for the future. This thesis proposes a low power, low voltage Delta-Sigma Modulator (DSM) for pacemaker front-end circuits. In our design, a low-distortion architecture is used. An inverter-based amplifier is used for low power consumption which is most concern in bio-medical applications. To reduce process variation, the offset compensation technique is introduced in switching procedure of the integrators. Additionally, bootstrapped S/H switches are developed for properly signal processing in ultra-low voltage condition. The proposed low-power, low-voltage DSM is operated under 25.6kHz clock rate and 100Hz input signal bandwidth with a supply voltage of 0.4V. The chip is implemented with TSMC 0.18μm CMOS technology with active die area of 0.71×0.59 mm2. As the results of measurement, the peak SNDR is 47.68dB and the dynamic range is 68.7dB. The chip consumes only 326nW. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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