新型自動調整交換式主動濾波器之設計

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

林頎鵬(Chie-Pon Lin)

指導教授 ： 黃育賢 ； 陳建中

國立臺北科技大學/電資學院/電腦與通訊研究所/碩士(2009年)

摘要

本論文的研究重點在於設計一個應用於生醫系統上的交換式可調主動濾波器。並使用低轉導值的運算放大器來實現一個四階的巴特沃茲濾波器，而濾波器頻寬的調整是藉由開關的責任週期來控制，並且為了降低開關中非理想效應的影響，所以電路採用全差動的方式來設計。此外，電路中還含有濾波器自動調整技術，調整的方式是直接對濾波器主電路做調整，並非使用主從式調整法，而自動調整技術的基礎架構為相位鎖定迴路。
晶片的製作是使用TSMC 0.18 μm 1P6M CMOS製程。濾波器可調整的頻寬範圍為150 Hz至250 Hz，供應電壓為單電源1V，濾波器的功率消耗為16.7 uW，整體晶片面積為1.1174 mm2 (1170 um*955 um，不含PAD)。

關鍵字

交換式電容濾波器 ； 低轉導值運算放大器 ； 生醫系統 ； 自動調整技術

並列摘要

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.

並列關鍵字

fully differential ； switched-capacitor filter ； low transconductance OTAs ； biomedical system ； automatic tuning

參考文獻

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