Patent ID: 7295054
Filing Date: 2007-11-13
Classification: H03F

Abstract:
1. A buffer capable of controlling a slew rate, comprising: a first amplifier connected to an output terminal of a Digital/Analog (D/A) converter of a drive Integrated Circuit (IC), and adapted to receive output voltage of the D/A converter and inversely amplify the output voltage; a second amplifier adapted to again inversely amplify output voltage that has been inversely amplified by the first amplifier; charging means connected to the output and input terminals of the second amplifier, and adapted to be charged with output voltage of the first amplifier; and a current control unit having modes of operation that are changed in response to a control signal and being connected to an output terminal of the first amplifier and the input terminal of the second amplifier, and being adapted to cooperate with said charging means to control the slew rate of the signal output by said second amplifier in a predetermined manner.