Radio frequency data communication device in CMOS process
First Claim
1. A self-regulated power supply, comprising:
- an RF-DC converter for converting an RF signal at an input node to a power signal at an output node;
a voltage sensor for monitoring said power signal to generate a control signal; and
a shunt element connected to said input node to attenuate said RF signal in response to said control signal;
wherein said voltage sensor drives said control signal at a first slew rate and a second slew rate while said second slew rate is greater than said first slew rate.
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Abstract
The present invention provides a passive RFID chip with on-chip charge pumps for generating electrical power for the chip from radio frequencies. The passive RFID chip comprises an analog portion and a digital portion. The analog portion primarily comprises a voltage sensor and an AM data detector. The digital portion comprises a state machine digital logic controller. Incoming RF signals enter the chip via external antennas. The RF signals are converted into regulated DC signals by RF-DC converters with the voltage sensor. The RF-DC converters provide power for all the on-chip components and hence the chip does not require external power supply. The incoming RF signals are demodulated by demodulators and enter the AM data detector where the envelope transitions are detected. A voltage alarm is provided to ensure the voltage level does not drop below an operational level of the chip. The logic signals and programming data are controlled by the state machine digital logic controller and the timing signals are provided by an on-chip oscillator.
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Citations
8 Claims
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1. A self-regulated power supply, comprising:
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an RF-DC converter for converting an RF signal at an input node to a power signal at an output node;
a voltage sensor for monitoring said power signal to generate a control signal; and
a shunt element connected to said input node to attenuate said RF signal in response to said control signal;
wherein said voltage sensor drives said control signal at a first slew rate and a second slew rate while said second slew rate is greater than said first slew rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification