Semiconductor device and wireless communication system

• US 20090255995A1
• Filed: 06/21/2006
• Published: 10/15/2009
• Est. Priority Date: 06/24/2005
• Status: Abandoned Application

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Atsumi, Tomoaki, Shionoiri, Yutaka
• Application Number:
  US11/921,557
• Publication Number:
  US 20090255995A1
• Time in Patent Office: Days
• US Class Current: 235/492
• CPC Class Codes: G06K 19/0701 at least one of the integrated circuit chips comprising an arrangement for power management
• CPC Class Codes: G06K 19/0715 the arrangement including means to regulate power transfer to the integrated circuit
• CPC Class Codes: G06K 19/0723 the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1266 the substrate on which the devices are formed not being the final device substrate, e.g. using a temporary substrate
• CPC Class Codes: H01L 27/13 combined with thin-film or thick-film passive components

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.

Claims

1. 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.

11. The semiconductor device according to any one of claims 1 to 3 and 6 to 8, wherein the digital circuit portion comprises a memory portion.

12. The semiconductor device according to any one of claims 1 to 3 and 6 to 8, wherein a power supply voltage of the analog circuit portion is equal to a power supply voltage of the digital circuit portion.

13. A wireless communication system comprising:

the semiconductor device according to any one of claims 1 to 10; and

a reader/writer communicating data with the semiconductor device through wireless communication.

2. 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.

3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.

14. 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.