Input buffer circuit based on GaAs process

Abstract

The invention discloses an input buffer circuit based on a GaAs process. The input buffer circuit comprises first to third PHEMT tubes, fifth to ninth PHEMT tubes, first to ninth resistors, eleventh to fourteenth resistors and a source follower circuit, wherein the first PHEMT tube and the second PHEMT tube form a pseudo-differential comparator structure, and by setting the values of the first resistor, the second resistor, the third resistor and the fourth resistor, it is ensured that the voltages near an overturning point are equal. According to the circuit structure, the sensitivity of theoverturning point voltage to the process deviation and the temperature change can be reduced; the GaAs digital circuit chip is simple in structure and low in cost, external common-mode noise interference is suppressed to a certain extent, the yield of the GaAs digital circuit chip is greatly improved, the safety and reliability of the circuit are further improved, normal work of the circuit is guaranteed, and full-swing output of the circuit is achieved.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, in particular to an input buffer circuit suitable for digital circuit driving based on GaAs technology. Background technique [0002] The input buffer circuit is an important part of the digital circuit, and its performance is directly related to the stability of the whole system. The voltage change of the flip point in the input buffer circuit is a problem often encountered in digital circuits, and it is also an inevitable problem in circuit design. The main reason is that the threshold voltage of the transistor is greatly affected by high and low temperature changes and process deviations, thus affecting to the working state of the circuit. [0003] Traditional serial-parallel circuits such as figure 1 As shown, it adopts a resistor divider structure, and its flipping voltage is closely related to the threshold voltage, which needs to be improved. Contents of the invention [0...

AI Technical Summary

Problems solved by technology

The voltage change of the flip point in the input buffer circuit is a problem often encountered in digital circuits, and it is also an inevitable problem in circuit design. The main reason is that the threshold voltage of the transistor is greatly affected by high and low temperature changes and process deviations, thus affecting to the working state of the circuit

[0003] Traditional serial-parallel circuits such as figure 1 As shown, it adopts a resistor divider structure, and its flipping voltage is closely related to the threshold voltage, which needs to be improved

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