A low-power and low-cost AC signal detection circuit

Abstract

The invention discloses a low-power-consumption low-cost AC signal detection circuit which is simple in structure and can be integrated in an SOC chip. The low-power-consumption low-cost AC signal detection circuit comprises an AC coupling capacitor, a current comparator and a voltage hysteresis comparator. The current comparator comprises first, second, third, fourth, fifth and sixth MOS transistors, and has an AC input end, a first DC bias input end, a second DC bias input end and a current comparison output end. The voltage hysteresis comparator is provided with a positive input end, a negative input end and a voltage comparison output end. The low-power-consumption low-cost AC signal detection circuit can be integrated in an SOC chip, and low-power-consumption and low-cost AC signal detection function is achieved.

Description

technical field [0001] The patent of the present invention relates to the field of electronics, in particular to a low-power and low-cost AC signal detection circuit that can be integrated in an SOC chip. Background technique [0002] Electronic automation is becoming more and more popular and has penetrated into all walks of life, bringing a strong impetus to social and economic development. However, ensuring the high reliability of electronic automation equipment under various interference conditions is a difficult problem that every equipment manufacturer must overcome. The core of electronic automation equipment is its internal main control SOC chip, and the immunity of the SOC chip to external interference is The key to equipment reliability. For SOC chips, the interference mainly comes from the coupling interference of external EMI / RFI high-frequency signals to the chip pins and the high-frequency interference on the power line. For this, external filtering and shieldi...

AI Technical Summary

Problems solved by technology

However, ensuring the high reliability of electronic automation equipment under various interference conditions is a difficult problem that every equipment manufacturer must overcome. The core of electronic automation equipment is its internal main control SOC chip, and the immunity of the SOC chip to external interference is The key to equipment reliability. For SOC chips, the interference mainly comes from the coupling interference of external EMI / RFI high-frequency signals to the chip pins and the high-frequency interference on the power line. For this, external filtering and shielding methods are usually used to suppress the interference. Will increase the size and cost of the device

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