Transient detection circuit
First Claim
Patent Images
1. A transient detection circuit comprising:
- a filter circuit coupled to a first node and a second node, the filter circuit having an output; and
an inverter circuit having an input coupled to the output of the filter circuit, the inverter circuit having a voltage switch point that includes an at least substantially constant voltage offset from the first node.
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Abstract
A transient detection circuit which may be used in an electrostatic discharge (ESD) clamp circuit. The transient detection circuit includes a filter circuit and an inverter circuit. The voltage switch point of the inverter circuit has a constant voltage offset from one of the nodes. When a filtered voltage level from the filter circuit crosses the voltage switch point of the inverter circuit (indicative of an ESD event), the inverter circuit provides a signal indicating an ESD event.
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Citations
32 Claims
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1. A transient detection circuit comprising:
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a filter circuit coupled to a first node and a second node, the filter circuit having an output; and
an inverter circuit having an input coupled to the output of the filter circuit, the inverter circuit having a voltage switch point that includes an at least substantially constant voltage offset from the first node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A circuit for providing electrostatic discharge (ESD) protection during an ESD event for internal components in an integrated circuit, the circuit comprising:
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a filter circuit coupled to a first node and to a second node, the filter circuit having an output;
an inverter circuit, having an input coupled to the output of the filter circuit, the inverter circuit having a voltage switch point that includes an at least substantially constant voltage offset from the first node, the inverter circuit having an output that is indicative of a detected ESD event; and
an on-time control circuit coupled to the output of the inverter circuit, the on-time control circuit having an output to provide a signal for making conductive at least one clamp switch to provide a discharge path for current from an ESD event. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. A method for detecting a slew rate of a detected voltage between a first node and a second node, the method comprising:
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filtering the detected voltage to provide a filtered voltage;
providing the filtered voltage as an input to an inverter circuit which has a voltage switch point that includes an at least substantially constant voltage offset from the first node; and
providing an output from the inverter circuit, wherein the output is a function of the slew rate as indicated by the filtered voltage and the voltage switch point. - View Dependent Claims (32)
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Specification