On designing linearly-tunable ultra-low voltage CMOS gm-C filters

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Lima, Jader A. de [UNESP]
Dualibe, Carlos [UNESP]

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A linearly-tunable ULV transconductor featuring excellent stability of the processed signal common-mode voltage upon tuning, critical for very-low voltage applications, is presented. Its employment to the synthesis of CMOS gm-C high-frequency and voiceband filters is discussed. SPICE data describe the filter characteristics. For a 1.3 V-supply, their nominal passband frequencies are 1.0 MHz and 3.78 KHz, respectively, with tuning rates of 12.52 KHz/mV and 0.16 KHz/m V, input-referred noise spectral density of 1.3 μV/Hz1/2 and 5.0μV/Hz1/2 and standby consumption of 0.87 mW and 11.8 μW. Large-signal distortion given by THD = 1% corresponds to a differential output-swing of 360 mVpp and 480 mVpp, respectively. Common-mode voltage deviation is less than 4 mV over tuning interval.



CMOS integrated circuits, Computer aided network analysis, Integrated circuit layout, Linear network analysis, Signal distortion, Signal filtering and prediction, Transconductance, Tuning, Voltage control, Software package SPICE, Electric filters

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Iscas 2000: IEEE International Symposium on Circuits and Systems - Proceedings, Vol Ii. New York: IEEE, p. 140-143, 2000.