Patent ID: 6724255
Filing Date: 2004-04-20
Classification: H02M,H03F

Abstract:
A high efficiency switching power amplifier for amplifying a high frequency input signal having at least one fundamental frequency, and adapted to drive a load, comprising:a high-speed active device that includes a switching component that operates substantially as a switch and a parasitic capacitance, Cout, in parallel wit the switching component; and a hybrid class E/F load network connected to the active device, wherein the network is configured to present to the switching component, at al harmonic frequencies substantially present in at least one of the voltage and current waveforms f the active device, (i) substantially inductive load at each fundamental frequency; (ii) a substantially open circuit at a predetermined number, NE, of even harmonic overtones for each fundamental frequency up to an Nth harmonic, (iii) a substantially short circuit at a predetermined number, NO, of odd harmonic overtones for each fundamental frequency up to an Nth harmonic, and (iv) a substantially capacitive impedance load at the remaining harmonic overtones, up to an Nth harmonic, where N&gE;3 and 1&lE;NE+NO&lE;Nâˆ’2.