A Timing Protection Circuit for Controlling Depletion Mode Power Devices

Abstract

The invention discloses a timing protection circuit for controlling depletion-type power devices, comprising: DAC, a first inverse proportional operation circuit, a second inverse proportional operation circuit, a voltage comparator, an enable signal output module and a PMOS tube control circuit; the DAC includes a first voltage output terminal and a second voltage output terminal; the first terminal of the first inverse proportional operation circuit is connected to the first voltage output terminal, and the second terminal of the first inverse proportional operation circuit is used as the gate voltage output terminal; the second terminal of the first inverse proportional operation circuit is connected to the negative input voltage terminal of the voltage comparator with a second inverse proportional operation circuit; the positive input voltage terminal of the voltage comparator is connected to the second voltage output terminal; The enable signal output module is used to output the enable signal to the PMOS transistor control circuit when the voltage comparator outputs a low level. It solves the technical problem in the prior art that the damage of the inverse proportional operation circuit or the improper gate voltage will cause the burnout of the depletion power device.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a sequential protection circuit for controlling depletion-type power devices. Background technique [0002] With the commercialization of 4G communication standards, the design requirements for power amplifiers are becoming more and more stringent. In power amplifiers, depletion-type power devices are often used. Depletion-type power devices are generally field effect transistors, which have three poles, which are Gate, Source, and drain. In essence, it belongs to a voltage-controlled current-type device (the gate voltage controls whether the drain can be turned on), and the turn-on voltage of the depletion-type power device is a negative voltage. Common depletion-mode power devices include GaAs devices and GaN devices. [0003] When depletion-mode power devices are used, it is necessary to strictly abide by the order of gate first and then drain, otherwise it may be perman...

AI Technical Summary

Problems solved by technology

[0009] The invention provides a timing protection circuit for controlling depletion-type power devices, which solves the technical problem in the prior art that the inverse proportional operation circuit is damaged or the grid voltage is not suitable, which will cause the depletion-type power devices to burn out

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