Semiconductor circuit
AssigneesKabushiki Kaisha Toshiba, Toshiba Electronic Devices & Storage Corporation
InventorsShigeo Imai, Naoya Waki, Munenori Sakai
Life of this patent
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Abstract
According to one embodiment, a semiconductor circuit includes a first transimpedance amplifier and a second transimpedance amplifier. The first transimpedance amplifier is configured to convert an input current to a first output voltage and output the first output voltage from a first output terminal when a reference voltage is supplied to a first input terminal and the input current is supplied to a second input terminal. The second transimpedance amplifier has a circuit configuration similar to a circuit configuration of the first transimpedance amplifier. The second transimpedance amplifier is configured to output a second output voltage from a second output terminal when the reference voltage is supplied to a third input terminal.
Claims16
A semiconductor circuit comprising:
- a first transimpedance amplifier having a first input terminal, a second input terminal, and a first output terminal, the first transimpedance amplifier being configured to convert an input current to a first output voltage and output the first output voltage from the first output terminal when a reference voltage is supplied to the first input terminal and the input current is supplied to the second input terminal;
- a second transimpedance amplifier having a third input terminal, a fourth input terminal, and a second output terminal, the second transimpedance amplifier having a circuit configuration similar to a circuit configuration of the first transimpedance amplifier and configured to output a second output voltage from the second output terminal when the reference voltage is supplied to the third input terminal;
- a differential input amplification circuit configured to remove an in-phase signal component between the first output voltage and the second output voltage;
- and
- an analog-digital conversion circuit configured to convert a voltage from which the in-phase signal component has been removed by the differential input amplification circuit to a digital value.
A semiconductor circuit comprising:
- a transimpedance amplifier having a first input terminal, a second input terminal, and an output terminal, the transimpedance amplifier being configured to convert an input current to an output voltage and output the output voltage from the output terminal when a reference voltage is supplied to the first input terminal and the input current is supplied to the second input terminal;
- a switch circuit configured to supply the input current to the second input terminal or interrupt supply of the input current;
- an analog-digital conversion circuit configured to convert the output voltage to a digital value and output a first signal and a second signal;
- a storage circuit configured to store the first signal output from the analog-digital conversion circuit;
- and
- a subtractor configured to subtract the first signal stored in the storage circuit from the second signal output from the analog-digital conversion circuit,
- wherein, when the supply of the input current to the second input terminal is interrupted by the switch circuit, the transimpedance amplifier outputs a first output voltage, the analog-digital conversion circuit converts the first output voltage to the first signal, and the storage circuit stores the first signal, and
- when the input current is supplied to the second input terminal by the switch circuit, the transimpedance amplifier outputs a second output voltage, the analog-digital conversion circuit converts the second output voltage to the second signal, and the subtractor subtracts the first signal stored in the storage circuit from the second signal.
Dependencies are inferred from the claim text.