Varactors
Book chapter, 2018

© 2008 by Taylor & Francis Group, LLC. All rights reserved. A varactor is a nonlinear reactive device used for harmonic generation, parametric amplification, mixing, detection, and voltage-variable tuning [1]. However, present applications of varactors are mostly harmonic generation at millimeter and submillimeter wave frequencies and as tuning elements in various RF & microwave applications. Varactors normally exhibit a voltage dependent capacitance and can be fabricated from a variety of semiconductor materials [2]. A common varactor is the reverse-biased Schottky diode. Advantages of varactors are low loss and low noise. The maximum frequency of operation is mainly limited by a parasitic series resistance; see Figure 13.1.

Author

Jan Stake

Chalmers, Microtechnology and Nanoscience (MC2), Terahertz and Millimetre Wave Laboratory

The RF and Microwave Handbook: RF and Microwave Passive and Active Technologies

13-1-13-17

Subject Categories

Other Physics Topics

Other Electrical Engineering, Electronic Engineering, Information Engineering

Condensed Matter Physics

More information

Latest update

3/23/2020