The PWM rectifier technology, of which the uncontrolled diode rectifier is replaced by a controlled IGBT is used in this paper in order to overcome these shortcomings.
为了克服这些缺点，本文利用PWM整流技术，用可控的IGBT取代不可控二极管整流。
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The MOSFET input diode is controlled by an electric field in the gate region, thus the input impedance is always extremely high because there is no forward biased diode to lower the input impedance.
The frequency response may also be controlled by a low voltage micro sized varicap, or a varactor diode, and instantiated as a tuned, resonant matching filter network residing with the antenna module.