Transmitter for high frequency signals

Details Transmitter for high frequency signals Transmitter for high frequency signals

1998-05-11

1999-10-26

Pascal, Robert

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

330 53, 330 51, 455 69, H03F 368

Patent

active

059735597

ABSTRACT:
The transmitter is built according to the LINC principle and has two parallel signal branches, each of which includes an amplifier (V1, V2) and a phase modulator (PM1, PM2). A dividing network (WE) is provided which divides the received signal (DI) between both signal branches and a combining device (KB) which adds the output signals (S11, S22) of both signal branches to form a sum signal (SS). In order to control the phase error in both signal branches the dividing network (WE) is designed so that the assignment of the received signal components (S1, S2) in both signal branches is periodically exchanged at a predetermined cycle frequency (fc). The amplitude modulation of the sum signal (SS) generated by the cyclic exchange of the input signal components (S1,S2) is detected and the phase depending on it in at least one of the signal branches is changed so that amplitude modulation is minimized.

REFERENCES:
patent: 3375458 (1968-03-01), Kelch
patent: 4010426 (1977-03-01), Rambo
patent: 4064464 (1977-12-01), Morse
patent: 4383189 (1983-05-01), D'Oro
patent: 5222246 (1993-06-01), Wolkstein
patent: 5287543 (1994-02-01), Wolkstein
patent: 5304943 (1994-04-01), Koontz
patent: 5831479 (1998-11-01), Leffel et al.
"Linear Amplification with Nonlinear Components", IEEE Transactions on Communication, Dec. 1974, pp. 1942-1945.

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