Subtractor circuit and operational amplifier
AssigneeSony Corporation
InventorAtsushi Hirabayashi
Life of this patent
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Abstract
Disclosed herein is a subtractor circuit for outputting an output voltage as a difference between a first input voltage and a second input voltage. The subtractor circuit may include a first semiconductor element, a second semiconductor element, a third semiconductor element, a fourth semiconductor element, a fifth semiconductor element, and a sixth semiconductor element configured to each invert a voltage input to an input terminal and output the inverted voltage from an output terminal; an input terminal of the first semiconductor element; an input terminal of the second semiconductor element; an output terminal of the first semiconductor element; and an output terminal of the third semiconductor element.
Claims8
A subtractor circuit for outputting an output voltage as a difference between a first input voltage and a second input voltage, said subtractor circuit comprising:
- a first semiconductor element, a second semiconductor element, a third semiconductor element, a fourth semiconductor element, a fifth semiconductor element, and a sixth semiconductor element configured to each invert a voltage input to an input terminal and output the inverted voltage from an output terminal;
- an input terminal of said first semiconductor element being connected to a first terminal to which said first input voltage is input;
- an input terminal of said second semiconductor element being connected to a second terminal to which said second input voltage is input;
- an output terminal of said first semiconductor element being connected to an input terminal of said third semiconductor element and an output terminal of said fourth semiconductor element;
- an output terminal of said third semiconductor element being connected to an input terminal of said fifth semiconductor element;
- the input terminal and an output terminal of said fifth semiconductor element being short-circuited, and the output terminal of said fifth semiconductor element being connected to an output terminal of said second semiconductor element and an input terminal of said sixth semiconductor element;
- and
- an output terminal of said sixth semiconductor element being connected to an input terminal of said fourth semiconductor element and a third terminal from which said output voltage is output.
An operational amplifier comprising:
- a subtractor circuit configured to output an output voltage as a difference between a first input voltage and a second input voltage;
- and
- an amplifier circuit configured to amplify the output voltage from said subtractor circuit, and output the amplified output voltage;
- wherein said subtractor circuit includes a first semiconductor element, a second semiconductor element, a third semiconductor element, a fourth semiconductor element, a fifth semiconductor element, and a sixth semiconductor element for each inverting a voltage input to an input terminal and outputting the inverted voltage from an output terminal,
- an input terminal of said first semiconductor element being connected to a first terminal to which said first input voltage is input,
- an input terminal of said second semiconductor element being connected to a second terminal to which said second input voltage is input,
- an output terminal of said first semiconductor element being connected to an input terminal of said third semiconductor element and an output terminal of said fourth semiconductor element,
- an output terminal of said third semiconductor element being connected to an input terminal of said fifth semiconductor element,
- the input terminal and an output terminal of said fifth semiconductor element being short-circuited, and the output terminal of said fifth semiconductor element being connected to an output terminal of said second semiconductor element and an input terminal of said sixth semiconductor element, and
- an output terminal of said sixth semiconductor element being connected to an input terminal of said fourth semiconductor element and a third terminal from which said output voltage is output, and
- said third terminal is connected to an input terminal of said amplifier circuit.
Dependencies are inferred from the claim text.