Segmented temperature compensation reference voltage source

Abstract

The invention relates to a reference voltage source, in particular to a segmented temperature compensation reference voltage source. According to the technical scheme provided by the invention, the segmented temperature compensation reference voltage source comprises a first-order temperature compensation band-gap reference module for simultaneously outputting band-gap reference voltage and negative temperature coefficient triode base-emitter voltage, and further comprises an output driving buffer and a segmented temperature compensation feedback module, the output driving buffer and the segmented temperature compensation feedback module are both adaptively connected with the first-order temperature compensation band-gap reference module, and the segmented temperature compensation feedback module is adaptively connected with the output driving buffer; temperature compensation can be carried out on the band-gap reference voltage, the temperature drift coefficient of the band-gap reference voltage is effectively reduced, the application range is widened, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to a reference voltage source, in particular to a subsection temperature compensation reference voltage source. Background technique [0002] The reference voltage source is an important part in the design of the analog circuit system. The output voltage value of the reference voltage source does not vary with factors such as power supply voltage, load current, and temperature. For the reference voltage source, resistor divider can be used as the reference voltage divider in simple application scenarios, but the voltage value obtained by this method is easily affected by the power supply voltage; in addition, the forward voltage drop of a diode or a field effect transistor can also be used The threshold voltage is used as the reference voltage, but the voltage value obtained in this way is easily affected by temperature. [0003] A bandgap reference is a common source of reference voltage. In the bandgap reference circuit, the n...

AI Technical Summary

Problems solved by technology

[0004] The temperature characteristic curve of the bandgap reference voltage is parabolic, which is because the negative temperature coefficient of the base-emitter voltage difference of the triode has a strong high-order term, but the base-emitter voltage difference between the triodes The positive temperature coefficient can usually only complete the compensation of a single term, which limits the temperature drift coefficient of the bandgap reference voltage value. In general, the bandgap reference has at least tens of ppm / °C (one millionth per degree Celsius) The temperature drift coefficient, and the bandgap reference circuit does not have driving capability, it needs to be driven by a cascaded voltage buffer to drive the subsequent circuit

Images