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An analysis of nonlinear terms in capacitance‐voltage characteristic for anti‐series‐connected varactor‐diode pair
Author(s) -
Akaike Masami,
Ohira Takashi,
Inagaki Keizo,
Han Qing
Publication year - 2004
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20010
Subject(s) - varicap , capacitance , differential capacitance , voltage , diode , waveform , microwave , electrical engineering , materials science , optoelectronics , physics , engineering , capacitor , electrode , quantum mechanics
Abstract A variable‐capacitance (varactor) diode is widely applied in microwave devices, which utilize the characteristic property that the junction capacitance is varied by an externally applied voltage. In applications of capacitance‐controlled devices, such as voltage‐controlled oscillators, the capacitance is varied by the control‐bias voltage, whereas the variation in capacitance for microwave RF‐signal voltages should be minimized in order to suppress higher‐order distortions in the output signal. The capacitance‐voltage characteristic of a varactor diode is characterized by a slope exponent γ. This article discusses the slope exponent that gives a minimum of variation in capacitance for the microwave excitation in the circuit in which diodes are connected in anti‐series. The analysis is based upon a time‐domain‐oriented method, in which we first obtain the voltage and current waveforms by solving differential equations with respect to time and then calculate the frequency‐domain quantities by Fourier analysis of voltage and current waveforms. © 2004 Wiley Periodicals, Inc. Int J RF and Microwave CAE 14: 274–282, 2004.