PVT self-calibration method based on high-speed asynchronous logic and SAR ADC circuit

Abstract

The invention discloses a PVT self-calibration method based on high-speed asynchronous logic and an SAR ADC circuit. According to the PVT self-calibration method, a high-speed asynchronous delay chainis selected; PVT state information of a current circuit is quantified with a small area and low power consumption cost; from the perspective of system quantization, a chip bias circuit is calibratedaccording to a PVT quantization code obtained through quantization to generate constant current, the substrate potential of a key analog circuit is controlled to achieve large-bandwidth, low-noise andhigh-speed comparison conversion and the like, and the PVT quantization code can also be used for controlling other circuits on SoC to conduct PVT calibration. According to the scheme, on the basis of maintaining the architecture of a traditional SAR ADC, the method has very high PVT fluctuation resistance, and is low in cost and high in robustness.

Description

technical field [0001] The invention relates to the field of process-voltage-temperature calibration and circuit yield rate, in particular to the field of a high-speed asynchronous SAR ADC circuit that needs built-in fixed delay feedback. Background technique [0002] Between different wafers and different batches, due to external factors such as doping, etching, and temperature in the semiconductor manufacturing process, the variation range of MOSFETs parameters is relatively large, which is the process fluctuation. At the same time, the temperature and voltage at which the circuit operates will also have an impact on the function and performance of the circuit. Generally, enough margin is left in the design of general circuits to enable the circuit to achieve functions and performance under all process-temperature-voltage combinations, which often leads to waste of resources such as power consumption. [0003] ADC is a conversion system that realizes digital quantization ...

AI Technical Summary

Problems solved by technology

At the same time, the current calibration of PVT is often only for a single circuit, and it is difficult to achieve shared detection and calibration of PVT. There is no solution for global calibration of the system from the perspective of quantizing PVT quantization codes.

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