Amplifier having substantially constant D.C. to r.f. conversion

Details Amplifier having substantially constant D.C. to r.f. conversion Amplifier having substantially constant D.C. to r.f. conversion

1989-12-15

1991-06-18

Mullins, James B.

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

33024R, H03F 368

Patent

active

050252259

ABSTRACT:
A power combiner which maintains substantially constant power combining efficiency with variable output power includes a set of unit amplifiers that are coupled by the power combiner. The power combiner includes a first plurality of a quarter wavelength transmission line sections coupled to the output of each unit amplifier. The second end of each one of the first plurality of quarter wavelength transmission line sections are successively coupled by a corresponding second plurality of quarter wavelength transmission line sections, with the succeeding or last one of said unit amplifiers having its quarter wavelength transmission line section coupled to an output terminal. The power combiner permits unit amplifiers in the amplifier module to be switched off in succession as less output power is required while maintaining substantially constant power combining efficiency, and hence substantially constant D.C. to r.f. conversion efficiency.

REFERENCES:
patent: 4315222 (1982-02-01), Saleh

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