Title :
Resistively variable capacitors: voltage and current approaches
Author :
Serrano, Luis ; Carlosena, Alfonso
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Zaragoza Univ., Spain
Abstract :
The Miller effect is used to design resistively variable capacitors. The effect is formulated in voltage- and current-mode versions and, in both cases, implementation based on operational amplifiers and, eventually, current mirrors are suggested. Their dynamic range and frequency response are analyzed and compared introducing limitations of the active devices. The current-mode implementation seems to offer advantages in both parameters
Keywords :
SPICE; active networks; circuit CAD; equivalent circuits; frequency response; Miller effect; SPICE simulation; active circuits; continuously tunable capacitors; current mirrors; current-mode; dynamic range; frequency response; operational amplifiers; resistively variable capacitors; voltage-mode; Active circuits; Capacitance; Capacitors; Circuit simulation; Dynamic range; Frequency response; Impedance; Mirrors; Voltage; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1992., Proceedings of the 35th Midwest Symposium on
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-0510-8
DOI :
10.1109/MWSCAS.1992.271297
