Abstract: A DC to DC converter including a resonant switching circuit (13, 51 , 115, 151, 125, 153); an impedance matching circuit (53) responsive to the resonant switching circuit; a rectifier circuit (55) responsive to the impedance matching circuit; an output filter circuit (57) responsive to rectifier circuit for providing a filtered DC to DC converter voltage output; and a varactor diode circuit (27, 29, 31, 61) responsive to the filtered DC to DC converter voltage output for controlling the impedance matching circuit such that the filtered DC to DC converter output voltage is substantially constant.

Abstract: A DC to AC inverter that includes a first capacitor (11) and a first inductor (13) connected in series between a positive voltage supply node and a central node; a first active switch switching (15) connected across the first capacitor and driven with a first periodic drive signal of a predetermined frequency; a second capacitor (21) and a second inductor (23) connected in series between a negative voltage supply node and the central node; a second active switch (25) connected across the second capacitor and being driven with a second periodic signal of said predetermined frequency and being out of phase by 180 degrees relative to the first periodic drive signal; a bandpass filter (31, 33) connected between the central node and an output node; and a load (47) connected between the output node and ground.

Abstract: VHF DC to AC inverters which include switching circuitry (13, 115, 125) and multiple resonant waveshaping networks (C11, L11, C12; C21, L21, C22; C111, L111; C221, L221; C331, L331; C441, L441) connected between the switching circuitry and respective load circuits (33, 43, 133, 143).