Analog delay cells for the power supply of an RFID tag
First Claim
Patent Images
1. A delay circuit for a power supply comprising:
- a power supply input and a power supply output;
a ramp circuit coupled between the power supply input and ground; and
a transistor having a current path coupled between the power supply input and the power supply output, and a control node coupled to an intermediate node of the ramp circuit,wherein the ramp circuit comprises a capacitor and a bandgap (BGAP) current source in series connection.
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Abstract
A delay circuit for an RFID tag includes a power supply input and a power supply output and one or more delay circuits in cascade connection between the power supply input and the power supply output. A first delay circuit includes a passive circuit, a second delay circuit includes a ramp circuit, and a third delay circuit includes a current mirror circuit.
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Citations
20 Claims
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1. A delay circuit for a power supply comprising:
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a power supply input and a power supply output; a ramp circuit coupled between the power supply input and ground; and a transistor having a current path coupled between the power supply input and the power supply output, and a control node coupled to an intermediate node of the ramp circuit, wherein the ramp circuit comprises a capacitor and a bandgap (BGAP) current source in series connection. - View Dependent Claims (2, 3, 4)
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5. A delay circuit for a power supply comprising:
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a power supply input and a power supply output; a current mirror circuit having an input coupled to a bandgap (BGAP) current source connected between the input of the current mirror circuit and ground, an output coupled to the power supply output, and a power node coupled to the power supply input; and a capacitor coupled between the power supply output and ground. - View Dependent Claims (6, 7, 8, 9)
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10. A delay circuit for an RFID tag comprising:
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a power supply input and a power supply output; and first and second delay circuits in cascade connection between the power supply input and the power supply output, wherein the second delay circuit comprises; a local power supply input and a local power supply output; a current mirror circuit having an input coupled to a current source, an output coupled to the local power supply output, and a power node coupled to the local power supply input; and a capacitor coupled between the local power supply output and ground. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A delay circuit comprising:
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a power supply input and a power supply output; and a first delay circuit and a second delay circuit in cascade connection between the power supply input and the power supply output, wherein the first delay circuit comprises a ramp circuit including a capacitor and a bandgap (BGAP) current source in series connection coupled between the power supply input and ground, and a transistor having a current path coupled between the power supply input and the power supply output, and a control node coupled to an intermediate node between the capacitor and current source of the ramp circuit. - View Dependent Claims (17, 18, 19, 20)
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Specification