The Research of Programmable Equivalent Capacitor Circuit

Abstract:

Resistors, inductors and capacitors 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.

• Periodical: Advanced Materials Research (Volume 981)
• Pages: 36-39
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.981.36
• Online since: July 2014
• Authors: Xia Sheng*, Qing Hua Shang, Zhen Huang, Bang Shao Wang
• Keywords: Equivalent Capacitance, Impedance Transformation, Programmable

References

[1] Yang Suxing. Analog electronic technology basic introductory tutorial . Higher education press. (2005).

[2] NiuMan, YuHongyun. Electronic circuit analysis and design. Tsinghua university press. (2009).

[3] far prefer jun zhao. Measurement of electronic circuit design. Beijing: science press. (2006).

[4] Dao Ye Bao. Oscillation circuit design and application. Beijing: science press. (2005).

[5] ShaZhanYou The design principle and application of digital potentiometer. Mechanical industry press. (2007).