University of California

Jinseong Jeong

Peter M Asbeck

Donald Kimball

An embodiment of the invention is a method of generating a reduced bandwidth envelope signal V(t) for the power supply modulator of an RF amplifier. An envelope signal of an RF amplifier input V(t) is low pass filtered. The filtered envelope signal is subtracted from the envelope signal to obtain a difference signal, which is rectified to produce a residue signal. The residue signal is low pass filtered and added back into the filtered envelope signal. An iterative process of the rectifying, low pass filtering the residue signal adding it back is continued until a condition of V(t)&#x2267;V(t) is met. Another embodiment provides a method of generating a reduced bandwidth envelope signal V(t) for the power supply modulator of an RF amplifier. An envelope signal of an RF amplifier input V(t) is low pass filtered. The filtered envelope signal is subtracted from the envelope signal to obtain a difference signal, which is rectified to produce a residue signal. The residue signal is low pass filtered and multiplied by a first constant that is greater than one, and then added back into the filtered envelope signal. A second constant is added into the filtered envelope signal so that the condition V(t)&#x2267;V(t) is met.

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Plano, TX, United States of America

Jinseong Jeong