Charge pump for radio frequency data communication device
First Claim
1. A charge pump having a plurality of series-connected stages, each of which comprises:
- a first diode having an anode connected to an input terminal and a cathode connected to a central terminal;
a second diode having an anode connected to said central terminal and a cathode connected to an output terminal;
a first capacitor connected between said central terminal and an input node;
a second capacitor connected between said output terminal and a reference node; and
a third diode having an anode connected to said output terminal and a cathode connected to an output node.
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Accused Products
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.
25 Citations
12 Claims
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1. A charge pump having a plurality of series-connected stages, each of which comprises:
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a first diode having an anode connected to an input terminal and a cathode connected to a central terminal; a second diode having an anode connected to said central terminal and a cathode connected to an output terminal; a first capacitor connected between said central terminal and an input node; a second capacitor connected between said output terminal and a reference node; and a third diode having an anode connected to said output terminal and a cathode connected to an output node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification