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Category Archives: Short and Sweet

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Noise distribution considerations for a multi-stage audio amplifier

Robust Circuit Design Posted on February 27, 2017 by adminNovember 13, 2017

In this article we investigate how thermal noise and thermal distortion play a part in the design of a phono audio signal chain. For our example, we’ll use a Shure M97XE cartridge, a 47K/200pF termination shunt, three gain stages of 10X … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged Johnson noise, thermal distortion, thermal noise | Leave a reply

Required Sensor Power – Part 3

Robust Circuit Design Posted on November 29, 2016 by adminNovember 30, 2016

In Parts 1 and 2 of this series on required sensor power we introduced you to the formulas needed to compute this power, and you got to see the formulas in action in Signal Chain Explorer. At the end of … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged ENOB, low-noise amplification, sensor power, SNR | Leave a reply

Required Sensor Power – Part 2

Robust Circuit Design Posted on November 26, 2016 by adminNovember 29, 2016

In Part 1 of this Short and Sweet article we introduced the concept of finding the minimum required power a sensor needs to deliver in order to achieve a desired signal quality for a given signal chain — that quality being … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged ENOB, sensor power, SNR | Leave a reply

Required Sensor Power – Part 1

Robust Circuit Design Posted on November 21, 2016 by adminNovember 29, 2016

New functionality was recently added to Signal Chain Explorer that computes the minimum sensor power required to achieve a desired SNR (or ENOB) for a particular signal chain. This feature was originally experimental, but it didn’t take us long to decide to include … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged ENOB, sensor power, SNR | Leave a reply

Understanding Effective Number of Bits

Robust Circuit Design Posted on November 18, 2016 by adminNovember 29, 2016

One of the main figures of merit computed by Signal Chain Explorer is the Effective Number of Bits (ENOB) of your signal chain. In this Short and Sweet article we’ll explain how that number is computed. The ENOB value relates the Signal … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged ADC, effective number of bits, ENOB, SINAD, SNR | Leave a reply

Understanding Input and Output Impedance

Robust Circuit Design Posted on November 3, 2016 by adminNovember 3, 2016

In the last Short and Sweet article we talked about the input and output impedances of inverting and non-inverting op-amp stages. We sort of jumped the gun a little, because we never mentioned exactly what is meant by input and output impedance. In particular, … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged input impedance, output impedance | Leave a reply

Visualizing Op Amp Impedances using SCE

Robust Circuit Design Posted on October 31, 2016 by adminOctober 31, 2016

One of the unique and powerful features of Signal Chain Explorer is the ability to quickly see the input and output impedances of a stage, both “locally” (stage by itself) and “globally” (backwards or forwards to the beginning or end of … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged inductive behavior, input impedance, output impedance, UA741 | Leave a reply

My KT lies over the C (Part 2)

Robust Circuit Design Posted on October 28, 2016 by adminNovember 4, 2016

In Part 1 of this Short and Sweet article we derived the formula for thermal noise as it applies to RC filter circuits: \(\displaystyle {{\eta }_{v}}^{2}={{KT}}/{C}\;\) In this blog post, we’ll try out various RC filters using Signal Chain Explorer and … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged capacitor noise, KT/C, thermal noise, thermal noise plots | Leave a reply

My KT lies over the C (Part 1)

Robust Circuit Design Posted on October 28, 2016 by adminNovember 4, 2016

My Bonnie lies over the ocean. My KT lies over the C … Okay, with that lame joke out of the way, in Part1 of this (perhaps not so) Short and Sweet two-part article, we’ll derive the well-known  \(\displaystyle {{\eta }_{v}}^{2}={{KT}}/{C}\;\) equation, … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged capacitor noise, KT/C, thermal noise | Leave a reply

Simple Digitized Audio Example

Robust Circuit Design Posted on August 19, 2016 by adminOctober 28, 2016

In this Short and Sweet blog post we’ll take a quick look at using Signal Chain Explorer to analyze a simple vinyl-to-digital audio signal chain, consisting of a Shure M97XE vinyl cartridge pickup, a twisted pair connection to a parallel RC … Continue reading →

Posted in Short and Sweet, Signal Chain Explorer | Tagged Bode plots, EFI, GPI, HFI, NE5532, PSI, Shure M97XE, thermal distortion, thermal noise | Leave a reply

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