Wireless communication IC and wireless communication information storage medium using the same
First Claim
1. A wireless communication integrated circuit (IC) for exchanging data with an external device by receiving a radio signal having a given carrier frequency as power supply from the external device through an antenna, comprising:
- a capacitor storing electric power;
a diode placed between an end of the antenna and the capacitor, supplying a charge current of the radio signal to the capacitor on a half cycle of the radio signal; and
a load modulation circuit driven by receiving power supply from the capacitor on another half cycle of the radio signal.
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Accused Products
Abstract
A wireless communication IC exchanges data with an external device by receiving a radio signal having a given carrier frequency as power supply from the external device through an antenna. The wireless communication IC includes a capacitor for storing electric power, a diode placed between one end of the antenna and the capacitor, for supplying a charge current of the radio signal to the capacitor on a half cycle of the received radio signal; and a load modulation circuit. The load modulation circuit is driven by receiving power supply from the capacitor on another half cycle of the radio signal different from a half cycle for supplying a charge current to the capacitor.
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Citations
8 Claims
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1. A wireless communication integrated circuit (IC) for exchanging data with an external device by receiving a radio signal having a given carrier frequency as power supply from the external device through an antenna, comprising:
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a capacitor storing electric power;
a diode placed between an end of the antenna and the capacitor, supplying a charge current of the radio signal to the capacitor on a half cycle of the radio signal; and
a load modulation circuit driven by receiving power supply from the capacitor on another half cycle of the radio signal.
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2. A wireless communication integrated circuit (IC) for exchanging data with an external device by receiving a radio signal having a given carrier frequency as power supply from the external device through an antenna, comprising:
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a capacitor for storing electric power;
a diode placed between an end of the antenna and the capacitor, supplying a charge current of the radio signal to the capacitor on a half cycle of the radio signal; and
a load modulation circuit comprising a series circuit of a first transistor and a first resistor in parallel to the antenna, and a drive circuit connected to the end of the antenna, for on/off driving of the first transistor by receiving power supply from the capacitor on another half cycle of the radio signal. - View Dependent Claims (3, 4)
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5. A wireless communication information storage medium for exchanging data with an external device by receiving a radio signal having a given carrier frequency as power supply from the external device through an antenna, comprising:
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an antenna receiving a radio signal having a given carrier frequency from the external device, a capacitor storing electric power;
a diode placed between one end of the antenna and the capacitor, supplying a charge current of the radio signal to the capacitor on a half cycle of the radio signal; and
a load modulation circuit driven by receiving power supply from the capacitor on another half cycle of the radio signal.
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6. A wireless communication information storage medium for exchanging data with an external device by receiving a radio signal having a given carrier frequency as power supply from the external device through an antenna, comprising:
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an antenna receiving a radio signal having a given carrier frequency from the external device, a capacitor for storing electric power;
a diode placed between an end of the antenna and the capacitor, supplying a charge current of the radio signal to the capacitor on a half cycle of the radio signal; and
a load modulation circuit comprising a series circuit of a first transistor and a first resistor in parallel to the antenna, and a drive circuit connected to the end of the antenna, for on/off driving of the first transistor by receiving power supply from the capacitor on another half cycle of the radio signal. - View Dependent Claims (7, 8)
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Specification