Patent ID: 6605995
Filing Date: 2003-08-12
Classification: H03F

Abstract:
A differential amplifier circuit comprising:a differential amplifier unit which has first and second input terminals and differentially amplifies first and second input signals respectively input to the first and second input terminals; a first voltage shift unit which is connected to a first external input terminal and the first input terminal, decreases the first external input signal by a first voltage when a first external input signal input from the first external input terminal is at high level or decreases the first external input signal by a second voltage smaller than the first voltage when the first external input signal is at low level, and supplies the resultant first external input signal as the first input signal to the first input terminal; and a second voltage shift unit which is connected to a second external input terminal and the second input terminal, decreases the second external input signal by the first voltage when a second external input signal input from the second external input terminal is at high level or decreases the second external input signal by the second voltage when the second external input signal is at low level, and supplies the resultant second external input signal as the second input signal to the second input terminal.