Title :
On designing linearly-tunable ultra-low voltage CMOS gm-C filters
Author :
De Lima, Jader A. ; Dualibe, Carlos
Author_Institution :
Dept. of Electr. Eng., Univ. Estadual Paulista, Sao Paulo, Brazil
Abstract :
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 in 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/mV, input-referred noise spectral density of 1.3 μV/Hz1/2 and 5.0 μV/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 the tuning interval
Keywords :
CMOS analogue integrated circuits; active filters; circuit stability; circuit tuning; elliptic filters; integrated circuit design; low-power electronics; 0.87 mW; 1 MHz; 1.3 V; 11.8 muW; 3.78 kHz; SPICE data; common-mode voltage; filter characteristics; filter tuning; gm-C filters; high-frequency filters; linearly-tunable CMOS filters; linearly-tunable transconductor; stability; ultra-low voltage CMOS filters; voiceband filters; Employment; Filters; Passband; SPICE; Signal processing; Signal synthesis; Stability; Transconductors; Tuning; Voltage;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.856278
