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basics

Sigma Delta ADC vs. SAR vs. Pipeline: How to Choose

May 24, 2021 By Janet Heath

Assuming that you are familiar with the fundamental specifications of an ADC and what they mean, the next step is to know your entire signal chain well and then work to fit the ADC to the requirements. After carefully determining signal chain requirements, then select your ADC with the understanding that if the ADC is […]

Filed Under: Analog ICs, Data Converters, FAQ, Featured, Products Tagged With: basics, FAQ

Reducing ringing or reflections by controlling impedance lines

May 18, 2021 By Janet Heath

controlling impedance lines

What is a controlled impedance line? For one thing, the term has to do with Printed Circuit Board (PCB) traces and layouts, which get more complex with higher frequency signals. Generally, you need not worry much about controlling impedance in traces unless you are working with signals at or above 50 MHz. However, most of […]

Filed Under: FAQ, Featured, PCB design Tagged With: basics, diodesinc, FAQ, pericomsemiconductor

Improving transimpedance amplifiers with a bootstrap

April 26, 2021 By Chris Francis

Analog bootstrap circuits are traditionally ones where output is fed back to the input, usually to increase input impedance. This can be to minimize either the resistive or reactive (usually capacitive) components of the input impedance or both. The term is now also used with MOSFET drivers where a capacitor is charged and used to […]

Filed Under: Amplifiers, FAQ, Featured, Industry Experts, Products Tagged With: basics, FAQ

Input bias current cancellation in bipolar op amps

April 23, 2021 By Chris Francis

Bipolar operational amplifiers have an essential input bias current requirement. This bias current has to come from somewhere and can be a nuisance in some types of high impedance circuits such as charge amplifiers and transimpedance amplifiers and can result in offset voltages where input resistances aren’t matched. The example shown below has an input […]

Filed Under: Applications, FAQ, Featured, Industry Experts, Products Tagged With: basics, FAQ

Noise simulation and analysis with SPICE

March 3, 2021 By Chris Francis

SPICE

When designing low noise circuits – signal conditioning circuits, amplifiers or analog to digital converter interfaces, for example – SPICE simulation can be helpful in ensuring you have a low noise solution, particularly where signal conditioning circuits are high gain. Input referred or output noise? One decision you need to make in noise analysis is […]

Filed Under: FAQ, Featured, Industry Experts Tagged With: basics, FAQ

Electrical noise can come from anywhere

January 3, 2021 By Janet Heath

op amp variations

Any unwanted signal that’s combined with the desired signal is called noise. In any circuit, noise can come from anywhere; from external systems as well as from  within a circuit itself. External sources include a number of sources such as power lines, RF transmitters, nearby conductors, ignition systems, or motors that turn on and off […]

Filed Under: Analog ICs, FAQ, Featured, Industry Experts Tagged With: basics, FAQ, fluke

Step-by-Step PCB Soldering tips for newbies

November 17, 2020 By Scott Thornton

soldering

The traditional, older type of solder is a mixture of lead (Pb) and tin (Sn). This type of (60/40 – Pb/Sn) solder melts at 200°C and is typically made up of 60 percent tin and 40 percent lead. However, lead-free solder is desirable today, in terms of avoiding a toxic environment. Lead-free solder is a […]

Filed Under: FAQ, Featured, PCB design Tagged With: basics, FAQ

Magnetic resonance imaging (MRI), Part 1: How it works

November 10, 2020 By Bill Schweber

Magnetic resonance imaging

The modern MRI system is an amazing blend of diverse technologies, based on the realization that a small but critical aspect of the spin of hydrogen nuclei could be leveraged to provide a safe, non-invasive way to see inside a human body. Magnetic resonance imaging (MRI) is an extraordinarily valuable and vital tool for non-invasive […]

Filed Under: Applications, FAQ, Featured, Medical Tagged With: basics, FAQ

Filters, Part 1: Analog, switched, and digital filters

November 4, 2020 By Bill Schweber

Filters are essential functions in most circuits and systems; as frequencies extend into the multi-GHz range, surface acoustic wave (SAW) and bulk acoustic wave (BAW) filters are needed to meet the design objectives. An engineer I worked with (and whose name I have forgotten) once remarked to about electronic filters (and he was serious): “like […]

Filed Under: Analog ICs, FAQ, Featured Tagged With: analogdevicesinc, basics, FAQ, qorvo, texasinstrumentsinc

Signal-channel diversity and fading, Part 1: Space diversity

November 3, 2020 By Bill Schweber

signal-channel diversity

In the engineering context, the phrase “channel diversity” refers to various techniques for getting a signal from point A to point B. The different approaches to diversity can be used individually or in combination. Q: What are the primary types of channel diversity in use? A: There are two primary types: space (spatial), and frequency. […]

Filed Under: Applications, FAQ, Featured, Telecommunications, Wireless Tagged With: basics, FAQ

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A frequency you can count on There are few constants in life, but what few there are might include death, taxes, and a U.S. grid frequency that doesn’t vary by more than ±0.5 Hz. However, the certainty of the grid frequency is coming into question, thanks to the rising percentage of renewable energy sources that…

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