Wide-range improvement of electrical parameter trimming accuracy circuit

A technology with a wide range of electrical parameters, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as poor accuracy, and achieve the effect of improving the overall accuracy

Active Publication Date: 2022-07-12
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 2 Once the target voltage / current parameter changes in a large range, the farther away from the trimming point, the worse the accuracy is, that is, the accuracy is the worst when the target parameter value is the minimum or maximum value.

Method used

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  • Wide-range improvement of electrical parameter trimming accuracy circuit
  • Wide-range improvement of electrical parameter trimming accuracy circuit
  • Wide-range improvement of electrical parameter trimming accuracy circuit

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Embodiment Construction

[0018] Below in conjunction with the accompanying drawings ( Figure 3-Figure 4 ) to describe the present invention.

[0019] image 3 It is a schematic structural diagram of a circuit implementing the invention to improve the accuracy of electrical parameter trimming in a wide range. Figure 4 Yes image 3 Schematic diagram of the difference between the ideal adjustment value and the actual value distribution range of electrical parameters obtained by using double adjustment points (T1 and T2). like Figure 3 to Figure 4 As shown in the figure, the circuit for improving the trimming accuracy of electrical parameters in a wide range includes a main circuit for trimming the second trimming point T2 and an additional circuit for trimming the first trimming point T1 connected to the main circuit. The main circuit includes a detection circuit, a first current mirror, a second current mirror and a first current judgment module connected in series in sequence, the additional circu...

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Abstract

A circuit for improving the accuracy of electrical parameter trimming in a wide range. On the basis of realizing single-point trimming by adjusting the current proportional coefficient of double current mirrors, the induced current is collected from the detection circuit and enters the second current judgment module, and the second current judgment module outputs the output. The adjustment current is supplied to the trim switch array, and the trim switch array generates a trim current that is poured into the mirrored MOS transistor of the first current mirror or a trim current pulled in from the mirrored MOS transistor of the second current mirror, so as to form a pair of new Positive and negative trimming of trim points, thereby improving the accuracy of electrical parameter trimming over a wide range formed by double trimming points.

Description

technical field [0001] The invention relates to an electrical parameter trimming technique of a chip circuit, in particular to a circuit for improving the trimming accuracy of electrical parameters in a wide range. The current enters the second current judging module, and the second current judging module outputs the adjustment current to the trim switch array, and the trim switch array generates the trim current that is poured into the mirror MOS transistor of the first current mirror or mirrored from the second current mirror. The trimming current drawn by the MOS tube forms the positive and negative trimming of the newly added trimming points, thereby improving the trimming accuracy of electrical parameters in the wide range formed by the double trimming points. Background technique [0002] In some applications, it is always desirable that certain voltage or current parameters can vary with the value of external components, such as the resistance of external resistors. ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G05F3/26
CPCG05F3/262
Inventor郑辰光于翔
OwnerSG MICRO