Charge pump apparatus and method used in an identification tag
First Claim
1. A method of operating a charge pump having a plurality of stages, comprising:
- receiving a radio frequency (RF) signal at an input of the charge pump;
generating a substantially direct current voltage using the plurality of stages of the charge pump responsive to the RF signal; and
providing the substantially direct current voltage to a radio frequency identification tag.
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Accused Products
Abstract
An identification (ID) tag includes a substrate having an input capable of receiving a high frequency signal. A first charge pump is coupled to the input and is configured to convert the high frequency signal to a substantially direct current (DC) voltage. A state machine is disposed on the substrate and is responsive to a data recovered by the second charge pump, where the state machine is capable of generating the control signal for the back scatter switch in response to the data. The DC voltage from the first charge pump is capable of providing a voltage supply for at least one of the data recovery circuit, the back scatter switch, and the state machine. The data recovery circuit includes a second charge pump that is capable of operating on the high frequency signal simultaneously with the first charge pump. In other words, the first charge pump can generate the supply voltage for the ID tag from the high frequency signal, while the second charge pump simultaneously retrieves the data from the high frequency signal.
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Citations
18 Claims
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1. A method of operating a charge pump having a plurality of stages, comprising:
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receiving a radio frequency (RF) signal at an input of the charge pump; generating a substantially direct current voltage using the plurality of stages of the charge pump responsive to the RF signal; and providing the substantially direct current voltage to a radio frequency identification tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A charge pump apparatus, comprising:
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an input to receive a radio frequency (RF) signal; and a plurality of stages, each stage including a means for rectifying the RF signal to generate a substantially direct current voltage based on the received RF signal, the substantially direct current voltage to be utilized by a radio frequency identification tag. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification