High-order temperature compensation complementary superposition-based high-precision band-gap reference circuit

Abstract

The invention discloses a high-order temperature compensation complementary superposition-based high-precision band-gap reference circuit. The circuit comprises an M-type temperature characteristic curve sub-circuit, a W-type temperature characteristic curve sub-circuit and a superposition mode selection sub-circuit, wherein the M-type temperature characteristic curve sub-circuit and the W-type temperature characteristic curve sub-circuit are arranged complementarily and symmetrically; both the M-type temperature characteristic curve sub-circuit and the W-type temperature characteristic curve sub-circuit comprise a feedback control circuit, a current generating circuit and an output circuit, wherein the current generating circuit is connected with the input end of the superposition mode selecting sub-circuit after being connected with an output circuit in series; and the output end of the output circuit is connected with the input end of the current generating circuit after being connected with the feedback control circuit in series. The circuit reduces a temperature coefficient of an output reference voltage to the maximum by using a nonlinear temperature compensation structure and a nonlinear temperature compensation method, thereby meeting the application of a high-precision system.

Description

technical field [0001] The invention relates to a composite high-order temperature-compensated bandgap reference circuit, which belongs to the technical field of analog circuits, and specifically relates to the generation of a two-order nonlinear temperature compensation reference, the adjustment of temperature characteristic curves, and the superposition or selection control of reference voltages. Background technique [0002] The reference voltage is similar to but different from the stabilized voltage source. The common point of both is that they can provide stable voltage. The reference voltage usually has no load driving capability and can only drive capacitive loads, but it has extremely high requirements on voltage stability, mainly including temperature stability and power supply stability. As the name suggests, the stabilized voltage source is a stable voltage source with strong load driving capability, so more attention should be paid to the output stability under ...

AI Technical Summary

Problems solved by technology

[0004] In the temperature range of -40°C to 125°C, the temperature coefficient of the existing classical linear compensation bandgap voltage base can theoretically be reduced to less than 10ppm / °C. On this basis, various types of high-order compensation based on the principle of piecewise nonlinear compensation For the benchmark structure, its temperature coefficient can be reduced to 3-5ppm / ℃. If the temperature coefficient continues to be reduced, not only the difficulty will increase obviously, but also the process sensitivity will increase with the decrease of the temperature coefficient, and the impact of process drift on circuit performance will increase. Difficulty of Baseline Adjustment

When the performance of the reference temperature coefficient after the maximum process drift is degraded to be worse than the temperature characteristics of the corresponding first-order linear compensation reference, the practical value of the reference high-order compensation structure is difficult to reflect

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