Patent ID: 8102156
Filing Date: 2012-01-24
Classification: H03F

Abstract:
1. A differential amplifier circuit, comprising: a first input transistor including a control electrode serving as a non-inversion input terminal; a second input transistor including a control electrode serving as an inversion input terminal, said second input transistor constituting a difference pair with the first input transistor; a bias current generation circuit section configured to generate a bias current flowing to the first and second input transistors; and an offset adjustment circuit section configured to adjust an input offset voltage appearing at said input terminals, said offset adjustment circuit section having an adjustment resistance formed from a first variable resistance inserted into a first current route connecting to the first input transistor, and a second variable resistance inserted into a second current route connecting to the second input transistor; wherein said bias current generation circuit section changes the bias current in accordance with a change in a value of the adjustment resistance and said bias current generation circuit section comprises: