Voltage regulation circuit for RFID systems
First Claim
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1. A voltage regulation circuit for an RFID circuit comprising:
- a voltage limiter circuit having a current sensing element for sensing current through the voltage limiter circuit, the voltage limiter generating a limited voltage;
a voltage regulator coupled to the limited voltage for generating a regulated output voltage, the voltage regulator having a dynamic biasing current responsive to an output of the sensing element for increasing bandwidth of the voltage regulator when current in the voltage limiter circuit increases.
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Abstract
A voltage regulation circuit for an RFID circuit having a voltage limiter circuit including a current sensing element for sensing current through the voltage limiter circuit. The voltage limiter generates a limited voltage. A voltage regulator is coupled to the limited voltage for generating a regulated output voltage. The voltage regulator has a dynamic biasing current responsive to an output of the sensing element for increasing bandwidth of the voltage regulator when current in the voltage limiter circuit increases.
25 Citations
20 Claims
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1. A voltage regulation circuit for an RFID circuit comprising:
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a voltage limiter circuit having a current sensing element for sensing current through the voltage limiter circuit, the voltage limiter generating a limited voltage;
a voltage regulator coupled to the limited voltage for generating a regulated output voltage, the voltage regulator having a dynamic biasing current responsive to an output of the sensing element for increasing bandwidth of the voltage regulator when current in the voltage limiter circuit increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. In a RFID transponder, a voltage regulator utilizing deep submicron components comprising:
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an error amplifier having a first bias level when an input current is in a first range and a second bias level when the input current exceeds the first range; and
a pass transistor coupled to an output of the error amplifier, whereby the voltage regulator is stable throughout its operating range. - View Dependent Claims (16, 17, 18)
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19. A current limiter comprising:
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a diode—
connected transistor coupled between a voltage source and a reference potential;
a plurality of current mirror—
connected transistors connected to the diode—
connected transistor and having a current path between the voltage source and the reference potential; and
the plurality of weighting resistors, each resistor being connected in the current path of one of the plurality of current mirror—
connected transistors. - View Dependent Claims (20)
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Specification