On designing linearly-tunable ultra-low voltage CMOS gm-C filters
نویسندگان
چکیده
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 highfrequency and voiceband filters is discussed. SPICE data describe the filter characteristics. For a 1.3V-supply, their nominal passband frequencies are 1.0MHz and 3.78KHz, respectively, with tuning rates of 12.52KHz/mV and 0.16KHz/mV, input-referred noise spectral density of 1.3μV/Hz and 5.0μV/Hz and standby consumption of 0.87mW and 11.8μW. Large-signal distortion given by THD=1% corresponds to a differential output-swing of 360mVpp and 480mVpp, respectively. Common-mode voltage deviation is less than 4mV over tuning interval.
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