JPS6234814U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a block diagram of an ALC circuit according to an embodiment of this invention, and FIG. 2 is a block diagram of a conventional ALC circuit. 1a and 1b are 3 dB hybrid couplers, 2 is a phase shifter, 3a and 3b are power amplifiers, 4 is a directional coupler, 5a is a control circuit, and 6a, 6b, and 6c are dummy resistors. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In an auto level control circuit that detects the output level and controls the output level by feeding back the level difference between this output level and a reference level to the input side, a distribution system that divides the input signal into two with a 90 degree phase difference. means, a phase shifter for changing the phase of one of the signals distributed by the distribution means, and amplifying the signal whose phase has been changed by the phase shifter and the other signal distributed by the distribution means, respectively. A pair of power amplifiers, a combining means for combining the signals amplified by these power amplifiers by distributing them into two with a phase difference of 90 degrees, and the above-mentioned transfer according to the output signal output from the combining means. An auto level control circuit comprising: control means for controlling a phase converter.