| Summary: | 碩士 === 國立交通大學 === 電機與控制工程系所 === 93 === The gm-C filter has been popular in high speed analog filter applications. However, to obtain accurate frequency response is not easy due to process variation. Although several tuning circuits are proposed to improve the accuracy, the cost and circuit complexity are usually very large. In this thesis, based on traditional threshold-voltage compensation method, we proposed a current source biasing technique to reduce the current error caused by inevitable threshold-voltage variation and power line IR drop. Finally we apply this technique to third order gm-C analog filter. SPICE simulations show that for 0.35-μm TSMC Mixed Signal 2P4M process with a 3.3 V power supply, filter passband frequency variation is reduced significantly.
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