Patent ID: 6714151
Filing Date: 2004-03-30
Classification: H03M

Abstract:
An A/D converter, comprising:a capacitor type D/A conversion circuit including a capacitor array composed of a plurality of capacitors for sampling an input potential and storing electric charge; a first resistor type D/A conversion circuit for generating a desired potential by potential division; a second resistor type D/A conversion circuit for generating a desired potential by potential division; a first signal path for connecting an output terminal of said first resistor type D/A conversion circuit to an output terminal of said capacitor type D/A conversion circuit by capacity coupling; a second signal path for connecting an output terminal of said second resistor type D/A conversion circuit to said output terminal of said capacitor type D/A conversion circuit by capacity coupling; and a comparing circuit for determining whether an output potential of said capacitor type D/A conversion circuit is higher or lower than the input potential.