Patent ID: 7782131
Filing Date: 2010-08-24
Classification: H03F

Abstract:
1. A balanced amplifier comprising: a first operational amplifier whose reverse-phase input terminal is connected to an input voltage source and whose reverse-phase input terminal is connected to an output terminal of said first operational amplifier; a second operational amplifier whose positive-phase input terminal is connected to the input voltage source and whose reverse-phase input terminal is connected to an output terminal of said second operational amplifier; and a voltage division circuit for dividing a reference voltage supplied from a reference voltage source, the reference voltage source being connected to a positive-phase input terminal of each of said first operational amplifier and said second operational amplifier through said voltage division circuit, wherein said voltage division circuit comprises at least: a first resistance and a second resistance connected between the output terminal of said first operational amplifier and the reference voltage source; and a third resistance and a fourth resistance connected between the output terminal of said second operational amplifier and the reference voltage source, the positive-phase input terminal of said second operational amplifier is connected between the first resistance and the second resistance, and a positive-phase input terminal of said first operational amplifier is connected between the third resistance and the fourth resistance.