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

• Autor(a) principal: Lima, Jader A. de [UNESP]
• Data de Publicação: 2000
• Outros Autores: Dualibe, Carlos [UNESP]
• Tipo de documento: Artigo de conferência
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1109/ISCAS.2000.856278; http://hdl.handle.net/11449/66059
• topic: 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

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.