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US 9,755,588 B2Granted
Signal output circuit
AssigneeAsahi Kasei Microdevices Corporation
InventorDaisuke Matsuoka
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AssigneeAsahi Kasei Microdevices Corporation
InventorDaisuke Matsuoka
Estimating the term…
An object is to output output signal amplitude exceeding power supply voltage or output signal amplitude falling below ground voltage without requiring a charge pump circuit or the like to generate positive or negative power supply voltage for an operational amplifier. The present invention provides a signal output circuit comprising an operational amplifier including: an amplification stage configured to amplify differential input voltage; and an output stage configured to amplify an input signal amplified by the amplification stage and output the input signal as an output signal, wherein the output stage is a switched capacitor circuit which includes switches and a capacitor configured to sample differential voltage between input voltage outputted from the amplification stage and voltage other than the input voltage and which transfers the differential voltage sampled by the capacitor by switching of the switches based on the input voltage.
A signal output circuit, including an operational amplifier including an amplification stage configured to amplify differential input voltage and an output stage configured to amplify an input signal outputted from the amplification stage and output the amplified input signal as an output signal,
A charge pump circuit for outputting an output signal from a semiconductor circuit including a flying capacitor, a smoothing capacitor, a first transistor group with a first conductivity type for charging an electric charge based on an input signal with first voltage in the flying capacitor, and a second transistor group with a second conductivity type different from the first conductivity type for recharging the electric charge from the flying capacitor to the smoothing capacitor, the output signal having second voltage stepped up or stepped down from the first voltage, the charge pump circuit comprising:
Dependencies are inferred from the claim text.