Accession Number : ADD016534

Title :   Hybrid High Power Amplifier.

Descriptive Note : Patent, Filed 28 Jun 93, patented 12 Jul 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hammond, Russell E ; Johnson, Leopold J

Report Date : 12 Jul 1994

Pagination or Media Count : 9

Abstract : The invention provides a high power, low distortion, high efficiency amplifier design incorporating a high efficiency switching amplifier used in conjunction with a linear difference amplifier. The high efficiency switching amplifier, typically of full or half bridge design, is designed to generate a high efficiency, arbitrarily formed, wave portion such as a square wave. The high efficiency waveform is scaled down and is compared to a desired reference, such as a sinusoid. The output of the comparison is the analog difference (mathematical subtraction) between the reference waveform and the scaled-down switch amplifier output wave. This difference signal is then used to drive the linear difference amplifier which simply scales the signal linearly. The two power signals, one from the switching amplifier and the other from the linear difference amplifier, are then summed magnetically. To permit a low harmonic output, the input signals to the switching amplifier and the reference are locked together in frequency.

Descriptors :   *AMPLIFIERS, *PATENTS, ANALOGS, DISTORTION, EFFICIENCY, HARMONICS, HIGH POWER, INVENTIONS, SIGNALS, SQUARE WAVES, SWITCHES, SWITCHING, WAVEFORMS, FREQUENCY, TRANSMITTERS, ELECTRIC BRIDGES

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE