期刊名称：International Journal of Hybrid Information Technology
印刷版ISSN：1738-9968
出版年度：2014
卷号：7
期号：3
页码：1-8
DOI：10.14257/ijhit.2014.7.3.01
出版社：SERSC
摘要：Resistors, inductors and capacitor are indispensable components in modern electronics field. While digital potentiometer is capable of conducting digital adjustments on resistances, the flexibility of adjusting the capacitance of most capacitors is still very limited even until now. This paper introduced a digital capacitor circuit based on impedance transformations. The impedance transformation circuit was set up by assembling an integrated operational amplifier and small amounts of resistors and capacitors. The capacitance of this circuit can be adjusted by controlling the resistance of a certain resistor using a digital potentiometer. Simulation results showed this circuit has many advantages including great flexibility if controlled with a single chip, wide capacitance adjustment range, insensitivity to temperature and pressure, and the size of the circuit remaining the same while the capacitance increases.
关键词：Programmable; Digital capacitor; Impedance transformation
