A low-cost, portable alternative for a digital Lock-In Amplifier using TMS320C5535 DSP

TENCON 2014 - 2014 IEEE Region 10 Conference Pub Date : 2014-10-01 DOI:10.1109/TENCON.2014.7022482

Asutosh Kar, Pankaj Goel, M. Chandra, V. Gupta

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引用次数: 3

Abstract

A Lock-In Amplifier (LIA) is used to remove noise from an input signal by the use of a reference signal. Generally the sampling rate of LIAs is much higher than the required frequency in typical applications. Moreover the hardware configuration of LIAs is much better than the requirement. The signals are processed using high-end signal processors which increase the cost of LIA. This paper aims to develop an inexpensive and portable alternative for the digital lock-in amplifier. This will enable application of LIAs in remote locations and in distributed systems which require multiple signal processors simultaneously. Similar implementation exists on microcontrollers and embedded processors. This paper utilizes a TMS320 series Digital Signal Processor (DSP) which is a low-power signal processor. The lock-in amplifier is implemented on A TMS320C5535 eZDSP board. Unlike other LIAs the reference signal is generated in the DSP, hence obviating the requirement for an external reference input. The output is obtained through UART interface and observed on a computer. It is tested with a noisy sinusoidal signal given as input and the output signal is plotted and verified.

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采用TMS320C5535 DSP的低成本、便携式数字锁相放大器

锁相放大器(LIA)用于利用参考信号从输入信号中去除噪声。在典型应用中，lia的采样率通常比所需频率高得多。此外，LIAs的硬件配置比需求要好得多。信号处理采用高端信号处理器，这增加了LIA的成本。本文旨在开发一种廉价、便携的数字锁相放大器替代方案。这将使LIAs在远程位置和同时需要多个信号处理器的分布式系统中的应用成为可能。类似的实现存在于微控制器和嵌入式处理器上。本文采用TMS320系列数字信号处理器(DSP)作为低功耗信号处理器。锁相放大器在TMS320C5535 eZDSP板上实现。不像其他的LIAs，参考信号是在DSP中产生的，因此不需要外部参考输入。输出通过UART接口获得，并在计算机上观察。用带噪声的正弦信号作为输入进行测试，并对输出信号进行绘图和验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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TENCON 2014 - 2014 IEEE Region 10 Conference

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