An analysis of nonlinear terms in capacitance-voltage characteristic for anti-series-connected varactor-diode pair
✍ Scribed by Masami Akaike; Takashi Ohira; Keizo Inagaki; Qing Han
- Book ID
- 102517947
- Publisher
- John Wiley and Sons
- Year
- 2004
- Tongue
- English
- Weight
- 154 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1096-4290
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✦ Synopsis
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 voltagecontrolled 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 ␥. 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-domainoriented 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.