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MAX6126BASA21+ 其他数据使用手册 - Maxim Integrated（美信）
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MAX6126BASA21+数据手册
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Keywords: semiconductor noise, thermal noise, flicker, popcorn noise
TUTORIAL 5664
MANAGING NOISE IN THE SIGNAL CHAIN,
PART1: ANNOYING SEMICONDUCTOR NOISE,
PREVENTABLE OR INESCAPABLE?
Abstract: Generally speaking, noise is any electrical phenomenon that is unwelcomed in an electrical system.
This article is the first of a three-part series about noise in the signal chain. Here we focus on the internal
sources of noise found in all semiconductor devices: thermal, shot, avalanche, flicker, and popcorn noise. A
procedure to estimate noise voltage will be given along with an example. Finally, a free calculator is
presented that aids in estimating noise under conditions that are not specified in a device data sheet.
A similar version of this article appears on EDN, October 14, 2013.
Introduction
This is the first in a three-part series on managing noise in the signal chain. In this article we will focus on the
characteristics of semiconductor noise found in all ICs, explain how it is specified in device data sheets, and
show how to estimate the noise of a voltage reference under real-world conditions not specified in the data
sheet. In Part 2 we will focus on sources of noise and distortion particular to data converters and show how it
is specified in those data sheets. Our concluding Part 3 brings together Parts 1 and 2, and shows readers
how to optimize their noise budget and choose the most appropriate data converter for their application.
Understanding electrical noise is more important today than it has ever been. As 14- and 16-bit data
converters are becoming mainstream and 18- and 24-bit converters are increasingly available, noise is often
the single factor that limits a system’s performance. Clearly, understanding the origins and characteristics of
noise generated within an IC is key to achieving a system’s greatest possible accuracy.
Noise can irritate everyone, but it is especially annoying to analog design engineers. Generally speaking,
noise is any unwelcome electrical phenomenon in a signal chain. Depending on its origin, it may be classified
as external (interference) or internal (inherent). This is illustrated in the signal-chain diagram below (Figure
1
). All internal noise sources (V ) have been combined at the output and all external noise sources (V )
have been combined at the input to the signal chain.
int ext
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