Semiconductor device and wireless communication system
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsYutaka Shionoiri, Tomoaki Atsumi
Life of this patent
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Abstract
Among transistors used in an analog circuit portion of the semiconductor device, particularly in a high frequency circuit, a power supply circuit, and a data demodulation circuit, and transistors used in a digital circuit portion (logic circuit portion), a gate length of a transistor in the analog circuit portion is not less than a gate length of a transistor in the digital circuit portion. As a result, when an excess voltage is supplied, voltage in the analog circuit with a long gate length is suppressed to prevent the damage of elements such as transistors in the digital circuit portion to which a signal is inputted from the analog circuit.
Claims14
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein a gate length of a transistor included in the analog circuit portion is not less than a gate length of a transistor included in the digital circuit portion.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, and a data demodulation circuit for demodulating the wireless signal;
- and
- wherein a gate length of a transistor included in each of the power supply circuit and the data demodulation circuit is not less than a gate length of a transistor included in the digital circuit portion.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, and a data demodulation circuit for demodulating the wireless signal;
- and
- wherein among transistors included in the power supply circuit and the data demodulation circuit, a gate length of each of a transistor connected to an input of the power supply circuit and a transistor connected to an input of the data demodulation circuit is not less than a gate length of a transistor included in the digital circuit portion.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, a data demodulation circuit for demodulating the wireless signal, and a clock generation circuit for generating a clock using an output of the data demodulation circuit;
- and
- wherein a gate length of a transistor included in each of the power supply circuit and the data demodulation circuit is not less than a gate length of a transistor included in the clock generation circuit.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, a data demodulation circuit for demodulating the wireless signal, and a clock generation circuit for generating a clock using an output of the data demodulation circuit;
- and
- wherein among transistors included in the power supply circuit and the data demodulation circuit, a gate length of each of a transistor connected to an input of the power supply circuit and a transistor connected to an input of the data demodulation circuit is not less than a gate length of a transistor included in the clock generation circuit.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein a gate length of a transistor included in the analog circuit portion is not less than twice a gate length of a transistor included in the digital circuit portion.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, and a data demodulation circuit for demodulating the wireless signal;
- and
- wherein a gate length of a transistor included in each of the power supply circuit and the data demodulation circuit is not less than twice a gate length of a transistor included in the digital circuit portion.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, and a data demodulation circuit for demodulating the wireless signal;
- and
- wherein among transistors included in the power supply circuit and the data demodulation circuit, a gate length of each of a transistor connected to an input of the power supply circuit and a transistor connected to an input of the data demodulation circuit is not less than twice a gate length of a transistor included in the digital circuit portion.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, a data demodulation circuit for demodulating the wireless signal, and a clock generation circuit for generating a clock using an output of the data demodulation circuit;
- and
- wherein a gate length of a transistor included in each of the power supply circuit and the data demodulation circuit is not less than twice a gate length of a transistor included in the clock generation circuit.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted,
- wherein the analog circuit portion comprises a power supply circuit for generating a DC voltage using the wireless signal, a data demodulation circuit for demodulating the wireless signal, and a clock generation circuit for generating a clock using an output of the data demodulation circuit;
- and
- wherein among transistors included in the power supply circuit and the data demodulation circuit, a gate length of each of a transistor connected to an input of the power supply circuit and a transistor connected to an input of the data demodulation circuit is not less than twice a gate length of a transistor included in the clock generation circuit.
A semiconductor device communicating data through wireless communication, comprising:
- an analog circuit portion to which a wireless signal is inputted;
- and
- a digital circuit portion to which an output signal from the analog circuit portion is inputted,
- wherein the shortest length of different gate lengths of a transistor included in the analog circuit portion is not less than the longest length of different gate lengths of a transistor included in the digital circuit portion.
Dependencies are inferred from the claim text.