Patent ID: 7002308
Filing Date: 2006-02-21
Classification: H02P

Abstract:
1. An amplitude regulation circuit for regulating a signal of each of a plurality of phases in a polyphase alternating signal at a constant amplitude, and outputting the regulated signal, comprising: variable gain amplifiers corresponding one-to-one with the plurality of phases, each of the variable gain amplifiers being operable to amplify a signal of a corresponding phase using a gain controlled by a control signal, and output the amplified signal; a maximum detection unit operable to output a maximum signal, based on an amplified signal having a highest level out of amplified signals which are output from the variable gain amplifiers; a minimum detection unit operable to output a minimum signal, based on an amplified signal having a lowest level out of the amplified signals; and a control signal generation unit operable to output, to each of the variable gain amplifiers, a control signal for decreasing the gain when a difference between the maximum signal and the minimum signal is greater than a predetermined reference value, and a control signal for increasing the gain when the difference is no greater than the predetermined reference value.