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Current-steering DAC (digital-to-analog converter) calibration method

A calibration method, current steering technology, applied in the direction of analog/digital conversion calibration/test

Inactive Publication Date: 2015-02-04
长沙瑞达星微电子有限公司
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AI Technical Summary

Problems solved by technology

[0004] The traditional current steering DAC has very high requirements on the consistency of the current source, and the mismatch and deviation of the current source due to process deviation are inevitable. This non-ideal factor affects the integral nonlinearity INL and differential nonlinearity of the current steering DAC. Static performance such as DNL has a very large impact

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  • Current-steering DAC (digital-to-analog converter) calibration method

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Embodiment Construction

[0015] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0016] A calibration method for a current steering DAC, such as figure 1 shown, including the following steps:

[0017] Step S1, testing the output current of the current steering DAC when the input data is all 0, expressed as an offset current;

[0018] Step S2, input the hexadecimal data 001, 002, 004, 008, 010, 020, 040, 080, 100, 200, 400, 800 respectively, respectively read the output current of the current steering DAC, and express it as current I ...

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Abstract

The invention provides a current-steering DAC (digital-to-analog converter) calibration method, and belongs to the field of integrated circuits. A current-steering DAC is a 12-bit current-steering DAC and implemented in a binary coding mode. The current-steering DAC firstly acquires an offset current value I0 by testing, secondly acquires 12 data currents by testing, thirdly subtracts the offset current value I0 from the 12 data currents to obtain a data action current, fourthly sets a target value of the data action current and finally calculates the difference between an actual value and the target value of the data action current to respectively adjust current sources corresponding to data. The current-steering DAC calibration method effectively solves the problem of poor static performances such as DAC INL (integral non-linearity) and DNL (differential non-linearity) caused by process mismatch and the like, and the performance of the DAC is greatly improved. Moreover, the calibration method is simple to operate and low in implementation cost and can be effectively applied to calibrating the current-steering DAC.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a calibration method for a current steering DAC. Background technique [0002] DAC is the abbreviation of digital-to-analog converter. As a bridge connecting analog signals and digital signals, digital-to-analog converters are more and more widely used in the information industry. In many occasions, the precision requirements for digital-to-analog converters are also increasing. higher. [0003] The traditional current steering DAC is composed of multiple independent current sources. These independent current sources are in one-to-one correspondence with the input data of the DAC. According to the different data encoding, the magnitude of the output current caused by these current sources is usually in a certain proportional relationship. The magnitude of the output current induced by the current source of the binary encoded data is in a binary proportional relationship. [0...

Claims

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Application Information

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IPC IPC(8): H03M1/10
Inventor 林剑辉
Owner 长沙瑞达星微电子有限公司
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