電流模式CMOS OTA濾波器實(shí)現(xiàn)
REALIZATIONS OF CIJRRENT-MODE CMOS OTA FILTERS
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摘要: 本文提出了利用CMOS OTA綜合連續(xù)時間電流模式濾波器的方法。應(yīng)用信號流圖模擬,系統(tǒng)地生成了二階CMOS OTA電流濾波器。分析了OTA的非理想因素對濾波器高頻性能的影響,并給出了簡單的高頻補(bǔ)償方案。最后,給出了一個四階巴特沃思低通濾波器的設(shè)計實(shí)例并經(jīng)PSPICE仿真證實(shí)。Abstract: A methodology to synthesise continous-time current-mode filters using CMOS OTAs is presented. Second-order CMOS-OTA current fllters are systematically generated from the simulation of signal flow graph for a general biquadratic function .The non-ideal effects in high frequency compensation frequency characteristic of OTA-C filters are analyzed. A simple high off frequency method is discussed. Finally, A 4th-order Butterworth lowpasss filter with 1MHz cut and simulated with PSPICE program.
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Wilson B, et al. Current-mode signal processing circuits, IEEE ISCAS, Helsinki: 1988, Vol. 3:[2]65-2668,[3]Toumazou C,et al. Eds, Current-Mode Analogue Signal Processing, IEE Proc. G., 1990, 137(2): 1-184.[4]Hughes B, et al. Switched-current-A new technique of analogue sampled-data signal processing, IEEE ISCAS, Pritland, 1989, Vol. 3: 1584-1587.[5]吳杰,邱關(guān)源.通信學(xué)報,1995, 16(1): 56-62.[6]Wu die. Int[J].J. Electronics.1994, 76(6):1115-1120 -
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