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AssigneeUniversity of Electronic Science and Technology of China
InventorsShaowei Zhen, Ping Luo, Ruhui Yang, Kang Yang, Bo Zhang
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This invention involves a bandgap reference circuit in IC. The temperature coefficient of conventional bandgap reference is large and the higher order compensation is difficult to implement. This invention provides an adaptive compensated bandgap reference which solves the problem only using lower order (first order) temperature coefficient compensation. The invention adopts segmental compensation circuit to realize adaptive segmental compensation of bandgap reference with low temperature coefficient. The technical solution includes traditional bandgap voltage reference circuit and adaptive feedback compensation circuit which consists of sample and hold circuit, voltage comparator and control module. This invention controls the bandgap voltage reference through systematical view and it has high process compatibility. This invention can find the best temperature characteristic curve adaptively, the output voltage has low temperature coefficient, meeting the requirement of fabrication process, the implementation is simple with small area. This invention relates to integrated circuits.
A temperature adaptive bandgap reference circuit, comprising a bandgap voltage reference including an output module, an adjustment module and a resistor network, the resistor network connected with the output module, the resistor network having two branches connected to ground by a first bipolar transistor and the second bipolar transistor, respectively, the adjustment module sampling a voltage of the two branches to adjust and output voltage of the output module, the adjustment module including a sample and hold circuit, a voltage comparator and a control module, the sample and hold circuit having an input connected with the output voltage of the output module, the sample and hold circuit having an output connected to an input of the voltage comparator, the voltage comparator having an output connected with an input of the control module the control module having an output connected with the resistor network, wherein according to the output of the voltage comparator, the resistance of the resistor network is change and the output voltage of the output module is changed, and finding the resistance of the resistor network when the output voltage reaches a maximum value results in the output voltage of the output module being a maximum voltage.
Dependencies are inferred from the claim text.