Patent ID: 6459336
Filing Date: 2002-10-01
Classification: H03F

Abstract:
An RF amplifier system comprising:a plurality of N actuatable switches, each switch being normally OFF and being actuated to an ON condition by a received turn ON pulse and remains ON for the duration of said turn ON pulse; said switches being connected in a series circuit with a load across a DC voltage source; an RF source providing a train of RF pulses exhibiting a fixed frequency and fixed duty-cycle and wherein each RF pulse is of a fixed magnitude and duration; and a control circuit that receives said RF pulses and provides therefrom said turn ON pulses which are of equal duration and which are synchronized to said RF pulses and wherein said control circuit simultaneously applies said turn ON pulses to said plurality of transistor switches, said control circuit including a pulse duration modulator that varies the duration of said turn ON pulses; wherein said train of RF pulses is a first train of first RF pulses and said modulator includes a phase shifter that receives said first RF pulses and provides therefrom a second train of second RF pulses identical to said first train of first RF pulses but phase shifted therefrom.