Bandgap ready circuit
First Claim
Patent Images
1. A bandgap ready circuit comprising:
- a bandgap circuit for providing a bandgap voltage;
a first replica branch and a second replica branch;
a first comparator for monitoring a first voltage in the first replica branch and a second voltage at a first node in the bandgap circuit and for providing a first logic signal;
a second comparator for monitoring a third voltage in the second replica branch and a fourth voltage at a second node in the bandgap circuit and for providing a second logic signal; and
a logic circuit for combining the first and second logic signals to provide a bandgap ready logic signal, wherein the first replica branch is a replica of a core branch in the bandgap circuit and comprises a transistor, resistor and diode coupled in series between a supply voltage and a circuit ground.
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Abstract
A bandgap ready circuit for an RFID tag includes a bandgap circuit for providing a bandgap voltage, a first comparator for monitoring first and second voltages in the bandgap circuit and for providing a first logic signal, a second comparator for monitoring third and fourth voltages in the bandgap circuit and for providing a second logic signal, and a logic circuit for combining the first and second logic signals to provide a bandgap ready logic signal.
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Citations
20 Claims
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1. A bandgap ready circuit comprising:
- a bandgap circuit for providing a bandgap voltage;
a first replica branch and a second replica branch;
a first comparator for monitoring a first voltage in the first replica branch and a second voltage at a first node in the bandgap circuit and for providing a first logic signal;
a second comparator for monitoring a third voltage in the second replica branch and a fourth voltage at a second node in the bandgap circuit and for providing a second logic signal; and
a logic circuit for combining the first and second logic signals to provide a bandgap ready logic signal, wherein the first replica branch is a replica of a core branch in the bandgap circuit and comprises a transistor, resistor and diode coupled in series between a supply voltage and a circuit ground. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a bandgap circuit for providing a bandgap voltage;
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9. A method of monitoring a bandgap circuit for providing a bandgap voltage comprising:
- monitoring a first voltage in a first replica branch in the bandgap circuit and a second voltage at a first node in the bandgap circuit and for providing a first logic signal;
monitoring a third voltage in a second replica branch in the bandgap circuit and a fourth voltage at a second node in the bandgap circuit and for providing a second logic signal; and
combining the first and second logic signals to provide a bandgap ready logic signal, wherein the first replica branch is a replica of a core branch in the bandgap circuit and comprises a transistor, resistor and diode coupled in series between a supply voltage and a circuit ground. - View Dependent Claims (10, 11, 12, 13, 14, 15, 20)
- monitoring a first voltage in a first replica branch in the bandgap circuit and a second voltage at a first node in the bandgap circuit and for providing a first logic signal;
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16. A bandgap ready circuit comprising:
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a bandgap circuit for providing a bandgap voltage including first and second current mirrors; a first replica branch and a second replica branch; a first comparator for monitoring a first voltage in the first replica branch and a second voltage in the first current mirror, and providing a first logic signal; a second comparator for monitoring a third voltage in the second replica branch and a fourth voltage in the second current mirror, and providing a second logic signal; and a logic circuit for combining the first and second logic signals to provide a bandgap ready logic signal, wherein the first replica branch is a replica of a core branch in the bandgap circuit and comprises a transistor, resistor and diode coupled in series between a supply voltage and a circuit ground. - View Dependent Claims (17, 18, 19)
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Specification