A temperature compensation circuit and temperature compensation method for a switch-type Hall sensor

Abstract

The invention discloses a temperature compensation circuit and a temperature compensation method of a switch-type Hall sensor, comprising: a Hall sheet, a differential amplifier, a switched capacitor circuit, a voltage stabilizer, and a hysteresis comparator, between the voltage stabilizer and the switched capacitor circuit A reference current generation circuit and a threshold voltage generation circuit are connected in series, and the reference current and threshold voltage are generated and supplied to the hysteresis comparator. The hysteresis comparator compares the amplified Hall induced voltage with the threshold voltage, and outputs the discrimination result to the output stage. The invention adds a reference current generation circuit module, changes the threshold voltage generation method, has higher temperature compensation accuracy, and is not affected by the non-linearity of the resistance temperature coefficient, and can realize indiscriminate high-precision compensation at each temperature value , which reduces the requirements on the used process lines, does not require specific positive and negative temperature coefficient resistors, and relaxes the selection of process lines for design engineers.

Description

technical field [0001] The invention relates to a temperature compensation circuit, in particular to a temperature compensation circuit of a switch-type Hall sensor; the invention also relates to a temperature compensation method of a switch-type Hall sensor. Background technique [0002] The Hall sensor is a magnetic field sensor made according to the Hall effect. The Hall effect is a kind of magnetoelectric effect, which was discovered by the American scientist Hall in 1879 when he was studying the conductive mechanism of metals. Later, it was found that the Hall effect of semiconductors is much stronger than that of metals. This phenomenon is used to make various Hall elements, which are widely used in industrial automation, automotive electronics, consumer electronics and other fields. [0003] Pass a bias current I across both ends of the semiconductor sheet, and apply a magnetic field with a magnetic induction intensity B in the vertical direction of the sheet, then a...

AI Technical Summary

Problems solved by technology

However, in practice, due to the non-linearity of the temperature coefficient of resistance, the compensation error of this scheme is relatively high, and it is impossible to achieve indiscriminate compensation at every temperature value.

In the production process of integrated circuits, affected by the precision of process control, the resistance value of different batches will have certain differences. Since the traditional compensation circuit uses two kinds of resistors with positive and negative temperature coefficients, the compensation effect is directly related to the resistance value. relationship, so traditional schemes are susceptible to process

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