Piecewise linear temperature compensating circuit and temperature compensation voltage reference source

Abstract

The invention discloses a sectional linear temperature compensating circuit and a temperature compensating voltage reference source. The sectional linear temperature compensating circuit consists of resistances and a triode, wherein the number of resistances is at least two; the base electrode of the triode is connected with the input port to constitute an input end. One end of a first resistance is connected with the input port, and the other end is connected with a ground wire; the emitting electrode of the triode is connected with the ground wire through a second resistance, and the collector electrode of the triode constitutes an output end. In the voltage reference source, the band-gap reference source and the input end of a positive-temperature coefficient electric current generating circuit are connected with a summing output circuit and a sectional linear temperature compensation circuit respectively. The output end of the sectional linear temperature compensating circuit is connected with the summing output circuit. The invention reduces the impact of resistance temperature on the output amount and has good process compatibility and temperature stability.

Description

technical field [0001] The invention relates to a temperature compensation circuit, in particular to a segmented linear temperature compensation circuit and a temperature compensation voltage reference source, which are mainly used in reference source circuits that need to generate low temperature coefficients in analog and digital-analog hybrid circuits. Background technique [0002] Reference source circuits are required in analog, digital-analog hybrid, and even pure digital circuits. According to different output methods, they can be divided into: voltage-type reference source (circuit for outputting constant voltage) and current-type reference source (for output The circuit for the purpose of constant current), the application occasions of the two types of reference sources are different. The stability of the reference source directly affects the overall performance of the circuit: the accuracy index (LSB, INL, DNL...) in the ADC / DAC circui...

AI Technical Summary

Problems solved by technology

Problems with this structure: 1. Strict requirements on the setting of process parameters for constructing the circuit, making it difficult to realize the process

Second, the influence of the temperature coefficient of resistance is ignored, resulting in a decrease in performance and a large deviation in the actual implementation process

3. The op amp structure is adopted, which has the influence of misalignment of the op amp, and the chip area is large, which increases the cost

4. Only the current reference can be realized, but the high-performance voltage reference cannot be realized

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