Design of Switched-Capacitor Tunable Filter with New Automatic Tuning Method

• Main Authors: Chie-Pon Lin, 林頎鵬
• Other Authors: 黃育賢
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/3a48c2

碩士 === 國立臺北科技大學 === 電腦與通訊研究所 === 97 === In this thesis, we design a switched-capacitor tunable filter for biomedical systems. The low transconductance OTAs implement a fourth-order Butterworth filter. The bandwidth is achieved through the use of duty cycle controlled tuning. In order to reduce the non-ideal effect of switch, therefore the filter uses fully differential architectures. Moreover, the Gm-C filter with on-chip automatic tuning is without master-slave scheme. The scheme of automatic tuning is direct tuning the Gm-C filter and employs a phase-locked loop (PLL). Physical chip was fabricated by using TSMC 0.18 um 1P6M CMOS process. The tunable bandwidth of filter is about 150 Hz to 250 Hz. The power supply and the power consumption are 1 V and 16.7 uW, and the chip area without I/O PAD is 1.1174 mm2.