Reference starting circuit adopting comparator with mismatch to detect current

Abstract

The invention discloses a reference starting circuit adopting a comparator with mismatch to detect current, which comprises a current mode reference circuit, a current detection circuit, a first-stage phase inverting circuit, a second-stage phase inverting circuit and a starting transistor, the current mode reference circuit, the current detection circuit, the first-stage inverting circuit, the second-stage inverting circuit and the starting transistor are connected in sequence, and the current detection circuit adopts a comparator with offset voltage at the positive input end. By using the current mode reference circuit, the current mode reference circuit can be successfully separated from a zero-current working point and a small-current working point after being electrified, so that the reference circuit works normally. The reference starting circuit adopting the comparator with mismatch to detect the current can be widely applied to the field of integrated circuits.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a reference start-up circuit using a comparator with mismatch to detect current. Background technique [0002] Bandgap reference circuit is a commonly used analog integrated circuit, its function is to provide a stable reference voltage or bias current for each circuit module in the integrated circuit that does not vary with ambient temperature and power supply voltage. The bandgap reference circuit is mainly divided into a bandgap reference with a voltage mode architecture and a bandgap reference with a current mode architecture. Among them, the output reference voltage of the bandgap reference of the voltage mode architecture is generally about 1.25V, which is not suitable for applications with low power supply voltage. The output voltage of the bandgap reference of the current mode architecture can be adjusted, which is less limited by the power supply voltage than the refe...

AI Technical Summary

Problems solved by technology

However, traditional start-up circuits for current-mode reference circuits cannot work on the current-mode reference circuit at the low-current state operating point

Under some extreme conditions, such as low temperature or process angle drift, after the circuit is powered on, the start-up circuit will work to make the circuit leave the zero current point and enter the low-current operating point and maintain stability. At this time, the voltage of the node has turned the start-up circuit off. while the circuit is not working properly

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