Electrostatic discharge protection circuit

Abstract

The invention discloses an electrostatic discharge protection circuit. The electrostatic discharge protection circuit comprises an input end, a resistor, a bipolar junction transistor and a diode, wherein the bipolar junction transistor is provided with an emitter electrode, a base electrode and a collector electrode; the emitter electrode of the bipolar junction transistor is coupled to the input end; the base electrode of the bipolar junction transistor is coupled to the input end through the resistor; the diode is provided with a first pole and a second pole; the first electrode of the diode is the collector electrode of the bipolar junction transistor; and the second pole of the diode is coupled to a supply potential.

Description

technical field [0001] The present invention relates to an electrostatic discharge (Electrostatic Discharge, ESD) protection circuit, in particular to an ESD protection circuit with low parasitic capacitance (Low Parasitic Capacitance) and high trigger voltage. Background technique [0002] In order to prevent the circuit system from being damaged by the high current generated when the electrostatic discharge event occurs, ESD protection circuits are widely used in various integrated circuits. An ESD protection circuit with low parasitic capacitance and high trigger voltage is especially required for high-power RF amplifiers. However, most ESD protection circuits usually have large parasitic capacitance, which will increase the capacitive load of the circuit and adversely affect the high frequency response of the circuit. For example, the pole (Pole) of the circuit will be shifted to low frequency due to the larger capacitive load, so that the operating frequency band of th...

AI Technical Summary

Problems solved by technology

However, most ESD protection circuits usually have large parasitic capacitance, which will increase the capacitive load of the circuit and adversely affect the high frequency response of the circuit

For example, the pole (Pole) of the circuit will move to the low frequency due to the large capacitive load, making the operating frequency band of the circuit narrower

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