An output drive circuit against ground bounce noise

Abstract

The invention relates to an output driving circuit capable of resisting ground bounce noise, and belongs to the field of semiconductor integrated circuits. According to the output driving circuit, certain time delay is introduced in the switching conversion process of an output driving PMOS transistor and an NMOS transistor by adding a logic circuit to avoid simultaneous conduction of the PMOS transistor and the NMOS transistor, and different driving capacities of the circuit in the static state and in the switching process are realized by making the driving transistors with different width-to-length ratios switched on successively. The output driving circuit can reduce the ground bounce noise, and has high driving capacity.

Description

technical field [0001] The invention relates to an output drive circuit against ground bounce noise, which belongs to the field of semiconductor integrated circuits. Background technique [0002] As the integration level of CMOS integrated circuits is getting higher and higher, the operating frequency is getting faster and faster, and there are more and more input and output pins, the synchronous switching noise is correspondingly larger. Synchronous switching noise will not only cause the jitter of the power supply and ground plane of the chip, but also affect the delay and distortion of other output signals. What is more serious is that if its maximum amplitude exceeds the threshold voltage of the transistor, the circuit will not work properly. . The output unit is the main noise source of synchronous switching noise, because the switching current flowing through the ground pin of the chip changes very rapidly, and the parasitic inductance of the package is also relativel...

AI Technical Summary

Problems solved by technology

[0005] like figure 2 As shown, in the traditional three-state output driving circuit, when the output level changes, the PMOS output transistor PM and the NMOS output transistor NM will be turned on at the same time within a certain period of time, which not only causes a large current change rate, but also leads to a large Ground bounce noise, but also a large power consumption

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