一种宽输入带迟滞功能的阈值产生电路

By designing a threshold generation circuit with wide input and hysteresis function, the problem of output driver damage caused by common-mode voltage deviation in long-distance transmission of RS485 interface circuits is solved. Dynamic control and noise immunity are achieved in a wide output voltage range, and it is suitable for RS422 and RS485 circuits.

CN117394845BActive Publication Date: 2026-07-17NO 24 RES INST OF CETC
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NO 24 RES INST OF CETC
Filing Date
2023-10-13
Publication Date
2026-07-17

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Abstract

本发明属于集成电路设计领域，具体涉及一种宽输入带迟滞功能的阈值产生电路；该电路包括：相互连接的PMOS电流源相关电路和NMOS电流源相关电路，PMOS电流源相关电路包括PMOS管P5～P18以及NMOS管N1～N4；NMOS电流源相关电路包括PMOS管P1～P4、NMOS管N5～N20以及电阻R1～R3；本发明通过对输入电压的监测将整体工作状态划分为三个不同的工作状态，每一种工作状态输出不同的逻辑信号；该逻辑信号配合后级电路，可根据输入电压的值起到不同的调控作用，并且加入迟滞功能使电路具备抗噪声功能；该电路可以被应用在各种需要监测宽输出电压的电路中。
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