Patent ID: 6717454
Filing Date: 2004-04-06
Classification: G06G

Abstract:
A switching mode N-order circuit, where N is an integer larger than or equal to two, comprising:a first unit including: an operational amplifier integral circuit for integrating a first voltage to produce an output of the first unit; and a switch for being controlled to discharge the operational amplifier integral circuit of the first unit; a comparator for comparing the output of the first unit with a second voltage to produce a control signal on an output of the comparator to control the switch of the first unit; and a second unit having one or more stages of subunits in cascade, each subunit including: an operational amplifier integral circuit for integrating its input voltage to produce its output; and a switch connected with the output of the comparator for being controlled to discharge the operational amplifier integral circuit of the respective subunit; wherein the input voltage of the first stage of subunit is connected with the second voltage and the output of the last stage of subunit is connected to an output of the N-order circuit, such that the second unit integrates the second voltage stage by stage by the subunits.