Voltage generating apparatus
AssigneeAdvantest Corporation
InventorSatoshi Kodera
Life of this patent
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Abstract
A voltage generating apparatus generates an output voltage based on an input voltage. A voltage generator includes a first operational amplifier operative to receive the input voltage and a feedback voltage proportional to the output voltage. The voltage generator regulates the output voltage so that a virtual short circuit is produced in the first operational amplifier. An output capacitor smoothes the output voltage generated by the voltage generating apparatus. A sense signal generator detects a current flowing in the output capacitor and generates a sense signal proportional to the current detected. An adder-subtractor circuit superimposes the sense signal on at least one of the input and the output of the first operational amplifier.
Claims12
A voltage generating apparatus for generating an output voltage based on an input voltage, comprising:
- a voltage generator including a first operational amplifier operative to receive the input voltage and a feedback voltage proportional to the output voltage, and operative to regulate and output the output voltage so that a virtual short circuit is produced in the first operational amplifier;
- an output capacitor operative to smooth the output voltage generated by the voltage generator;
- a sense signal generator operative to detect a current flowing in the output capacitor and generate a sense signal proportional to the current detected;
- and
- an adder-subtractor circuit operative to superimpose the sense signal on at least one of the input and the output of the first operational amplifier.
A voltage generating apparatus for generating an output voltage based on an input voltage, comprising:
- a voltage generator operative to regulate and output the output voltage using feedback so that a predetermined relation holds between the input voltage and a feedback voltage proportional to the output voltage;
- an output capacitor operative to smooth the output voltage generated by the voltage generator;
- a sense signal generator operative to detect a current flowing in the output capacitor and generate a sense signal proportional to the current detected, wherein the voltage generator causes the feedback based on the sense signal to be reflected in the feedback based on the output voltage.
Dependencies are inferred from the claim text.