一种I/F转换电路的多维补偿算法

A multi-dimensional compensation algorithm of I/F conversion circuit

关键词:  I/F转换电路  温度系数  非线性度  多维补偿

Key words:  I/F conversion circuit  Temperature coefficient  Non-linearity  Multi-dimensional compensation

摘要:

I/F转换电路是一种积分型模数转换电路。针对应用场景对I/F转换电路日益提高的精度需求，将传统的标度因数温度系数补偿算法与非线性补偿算法结合，提出了I/F转换电路的多维补偿算法，能够改善全温范围内的非线性度，同时提升全量程下的标度因数温度系数。测试结果表明，设计的算法有效，补偿后电路全温范围内的非线性度约为5.51×10-6，全量程下的温度系数约为1.51×10-7/℃，补偿效果较传统方法有了大幅提高。

Abstract:

I/F conversion circuit is a kind of integral analog-to-digital conversion circuit. To meet the increasing accuracy requirements of I/F conversion circuit in application scenarios, a multi-dimensional compensation algorithm of I/F conversion circuit is proposed by combining the traditional scale-factor temperature coefficient compensation with the non-linearity compensation. Through the proposed algorithm, both the non-linearity of the full temperature range and the scale-factor temperature coefficient of the full scale are improved. The experimental results show that the proposed algorithm is effective. The non-linearity of the full temperature range is about 5.51×10-6, and the temperature coefficient of the full scale is about 1.51×10-7/℃ after compensation. The compensation effect is greatly improved compared with the traditional method.