Semiconductor device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorYutaka Shionoiri
Life of this patent
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Abstract
The adverse effect of noise a constant voltage receives in a semiconductor device capable of data communication through wireless communication is suppressed. Further, communication is performed normally with a constant voltage with less noise even in the case where the amount of received power is large. The semiconductor device includes an input circuit for generating a DC voltage from an AC signal, a circuit for generating a constant voltage lower than the DC voltage, a circuit portion supplied with the constant voltage, a filter, and a feedback circuit for changing impedance with the constant voltage input from the circuit for generating a constant voltage, wherein the filter is electrically connected between the input circuit and the circuit for generating a constant voltage.
Claims12
A semiconductor device comprising:
- an antenna
- an input circuit configured to generate a DC voltage from an Ac signal supplied from the antenna;
- a filter;
- a circuit for generating a constant voltage configured to generate the constant voltage from the DC voltage supplied through the filter;
- a circuit portion comprising a memory;
- and
- a feedback circuit configured to change impedance of the semiconductor device in accordance with the constant voltage,
- wherein the constant voltage is supplied to the circuit portion and the feedback circuit from the circuit for generating the constant voltage,
- wherein the input circuit is directly connected to the antenna, and
- wherein the feedback circuit is directly connected to the antenna.
A semiconductor device comprising:
- an antenna;
- an input circuit configured to generate a DC voltage from an AC signal supplied from the antenna;
- a filter;
- a circuit for generating a constant voltage configured to generate the constant voltage from the DC voltage supplied through the filter;
- a circuit portion;
- and
- a feedback circuit configured to change impedance of the semiconductor device in accordance with the constant voltage,
- wherein the constant voltage is supplied to the circuit portion and the feedback circuit from the circuit for generating the constant voltage,
- wherein the input circuit is directly connected to the antenna, and
- wherein the feedback circuit is directly connected to the antenna.
Dependencies are inferred from the claim text.