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US 8,803,193 B2Granted
Overvoltage and/or electrostatic discharge protection device
AssigneeAnalog Devices, Inc.
InventorEdward Coyne
Life of this patent
Estimating the term…
Abstract
An overvoltage protection device in combination with a filter, the overvoltage protection device having a first node for connection to a node to be protected, a second node for connection to a discharge node; and a control node; and wherein the filter comprises at least one of: (a) a capacitor connected between the first node and the discharge node; (b) a capacitor connected between the control node and the discharge node; or (c) an inductor in series connection with the first node.
Claims27
An apparatus comprising:
- an overvoltage protection device comprising:
- a first node providing a connection to a node to be protected;
- a second node providing a connection to a discharge node;
- a control node;
- a bipolar transistor comprising a collector coupled to the first node, a base coupled to the control node, and an emitter coupled to the second node;
- a first component having a first impedance coupled between the control node and the discharge node;
- and
- a second component having a second impedance coupled between the second node and the discharge node, wherein a direct current (DC) holding voltage of the overvoltage protection device is based on a ratio between the first impedance and the second impedance;
- and
- a filter configured to attenuate a high frequency component of a transient overvoltage event such that an effect of the transient overvoltage event on an alternating current (AC) holding voltage of the overvoltage protection device is reduced, the filter comprising at least one of:
- a first capacitor connected between the first node and the discharge node;
- a second capacitor connected between the control node and the discharge node;
- or
- an inductor in series connection with the first node.
11 more elements
Dependencies are inferred from the claim text.