NON-VOLATILE MEMORY CHARGE PUMP FOR RADIO FREQUENCY IDENTIFICATION (RFID) SYSTEM
First Claim
1. A circuit comprising:
- antenna circuitry configured for receiving a radio frequency signal; and
charge pump circuitry coupled to the antenna circuitry, the charge pump circuitry configured for using voltage signals output by the antenna circuitry to generate a pump voltage.
17 Assignments
0 Petitions
Accused Products
Abstract
A charge pump is incorporated into circuitry of an RFID tag. The charge pump takes advantage of an antenna voltage phase to eliminate the need for a charge pump clock generator. Placement of the charge pump in the RFID circuitry reduces the number of pump stages and eliminates drivers used in each pump stage. In some implementations, an RFID tag comprises antenna circuitry, including a tuned antenna, for receiving an RF signal. Voltage conversion circuitry in the RFID tag is coupled to the antenna circuitry and operable for converting a varying magnetic field produced in the antenna to a voltage source. A charge pump is coupled to output voltage signals of the antenna circuitry which provide the charge pump with a high starting reference voltage and a two phase pump clock.
11 Citations
10 Claims
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1. A circuit comprising:
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antenna circuitry configured for receiving a radio frequency signal; and charge pump circuitry coupled to the antenna circuitry, the charge pump circuitry configured for using voltage signals output by the antenna circuitry to generate a pump voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification