Reference voltage regulating circuit and system of integrated circuit

Abstract

The invention discloses a reference voltage regulating circuit of an integrated circuit. A reference voltage system of the integrated circuit comprises an LDO module, a regulation module and a regulation control module. The regulation module comprises a first-stage calibration and regulation module and a second-stage calculation and regulation module. The regulation control module is connected with an off-chip program control module, a regulation control signal is generated according to a calibration signal provided by the program control module, the first-stage calibration and regulation module conducts first-stage calibration on reference voltage of the integrated circuit according to the regulation control signal, the second-stage calibration and regulation module conducts second-stage calibration on the basis of first-stage calibration according to the regulation control signal, the reference voltage is regulated to preset reference voltage, and accordingly the voltage range and precision of reference voltage regulation are effectively improved through two stages of calibration. The invention further discloses a reference voltage regulation system of the integrated circuit. The reference voltage regulating system comprises the reference voltage regulation circuit and the off-chip program control module.

Description

technical field [0001] The invention relates to the technical field of integrated circuit testing, in particular to an integrated circuit reference voltage trimming circuit and system. Background technique [0002] In integrated circuits, a constant reference voltage is generated inside the chip to provide accurate and stable reference voltage values ​​for internal digital circuits and analog circuits, that is, voltage references are an integral part of analog circuits and digital circuits. In the production process, usually due to uncertain factors such as reference voltage offset, temperature drift, and process deviation, the accuracy of the reference voltage of the chip often deviates from the preset value. Factors such as reference voltage offset and temperature drift often lead to the failure of the overall circuit function. The accuracy of the reference voltage directly affects the accuracy of integrated circuit data acquisition, affecting LDO (low dropout regulator, l...

AI Technical Summary

Problems solved by technology

Among them, laser repair can only be carried out before chip packaging, the application range is limited, and the yield rate of the process is poor, and has been gradually eliminated; OTP repair and NVM repair are mostly used in digital circuits, and generally for specific processes, the practical range is narrow ;Current fuse is a scheme that is widely used in integrated circuits

The main disadvantage of the current voltage trimming scheme based on the current fuse method is that the current voltage trimming scheme usually only has one level of voltage calibration, which leads to insufficient adjustment accuracy when the trimming voltage range is too large, and the trimming range is too small when the accuracy is sufficient.

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