Switching mode N-order circuit
AssigneeFrontend Analog and Digital Technology Corporation
InventorsMing-Hsiang Chiou, Chen-Yu Hsiao
Life of this patent
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Abstract
A switching mode N-order circuit comprises a first unit, a second unit and a comparator. The first unit includes an operational amplifier integral circuit to integrate a first voltage. The second unit has one or more stages of subunits in cascade each including an operational amplifier integral circuit to integrate a second voltage stage by stage. Each of the operational amplifier integral circuits is equipped with a switch to be controlled by the comparator to be discharged. The output of the N-order circuit is derived from the output of the second unit.
Claims14
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.
A method for generating an output voltage having an amplitude proportional to N-order of an amplitude of a first voltage, where N is an integer larger than or equal to two, the method comprising the steps of:
- integrating a second voltage for producing a third voltage;
- integrating the first voltage by N−1 stages of integral circuits in cascade before an amplitude of the third voltage reaches the amplitude of the first voltage for producing a fourth voltage;
- and
- deriving the output voltage from the fourth voltage.
Dependencies are inferred from the claim text.