Patent ID: 6335616
Filing Date: 2002-01-01
Classification: G01R,G06F,H03K

Abstract:
A ringing preventive circuit, comprising:buffer amplifier having an input terminal and an output terminal; a first comparator having a first input terminal connected to said output terminal of said buffer amplifier, a second input terminal provided with a first reference voltage, and an output terminal, for outputting a first control signal from said output terminal in response to a result of comparison between voltages at said first and second input terminals; and a first current supply circuit having a first terminal connected to a first power source for supplying a first voltage, a second terminal connected to said input terminal of said buffer amplifier, and a control signal input terminal connected to said output terminal of said first comparator, for controlling conduction and non-conduction of a current flowing from said first terminal to said second terminal as a function of said first control signal, wherein said first current supply circuit, comprises: a first constant current source having a first terminal connected to said first power source, and a second terminal, for supplying a specific current from said first terminal to said second terminal, and a first switch means having a first current electrode connected to said second terminal of said first constant current source, a second current electrode connected to said input terminal of said buffer amplifier, and a control electrode connected to said output terminal of said first comparator, for controlling conduction and non-conduction of the current flowing between said first and second current electrodes in response to said first control signal provided to said control electrode.