Circuit outputting adjustable positive and negative or zero-temperature coefficient electrical current and voltage reference

Abstract

The invention provides a circuit for outputting adjustable positive, negative or zero temperature coefficient current and voltage reference, including: a start-up circuit, a positive and negative temperature coefficient current generation circuit, a feedback stable and negative temperature coefficient current derivation circuit, and the temperature coefficient can be Adjusted current reference, voltage reference synthesis circuit. The invention is realized under the standard CMOS technology, has simple structure, low input voltage, and can generate current reference and voltage (VREF) reference with adjustable temperature coefficient, which can be positive, negative or zero temperature coefficient.

Description

technical field [0001] The invention belongs to the technical field of circuits, in particular to an output-adjustable positive, negative or zero temperature coefficient current and voltage reference circuit. Background technique [0002] The function of current reference and voltage reference is to provide reference current and reference voltage to other functional modules in the circuit respectively, which are very important for oscillators, filters, digital-to-analog conversion and precise time delay modules. Circuits with different functions may require currents or voltages with different temperature coefficients, and the temperature coefficients need to be adjusted during circuit simulation and debugging. And some circuits work with lower supply voltages, which reduces power consumption. In addition, in some special-purpose integrated circuit products, it is also necessary to save chip area, save space or reduce cost, which requires that the circuit structure should no...

AI Technical Summary

Problems solved by technology

[0003] Ordinary current references, using classic self-bias circuits, can only generate PTAT currents, and need to be processed by other subsequent circuits to generate zero temperature coefficient currents; while the output voltage value of the more commonly used voltage references is basically constant at 1.25V. Left and right, and there is an operational amplifier in the circuit to ensure that the voltages at the two output terminals of the bandgap circuit are equal, which requires the operational amplifier to have high gain and low offset characteristics, which will make the design of the operational amplifier more difficult under low voltage and low power consumption. Therefore, it is required to improve the circuit structure

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