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Chris Francis

A closer look at photodiodes

October 20, 2017 By Chris Francis Leave a Comment

I have touched on light sensing methods and the amplification of the signals from them in the past, but at a more fundamental level, how do you choose one? What parameters are important? The answer depends, among other things, on the light source (focused or not), the amount of light and its color. Focused or […]

Filed Under: FAQ, Transistor Tagged With: basics, FAQ, hammamatsu

Six considerations for better circuit protection

October 2, 2017 By Chris Francis Leave a Comment

In an electronic system where the power source can be connected the wrong way round, protection should be considered to prevent damage to the circuitry. Most electronic circuits don’t like the power supply being reversed. However, there are other eventualities you could protect your circuit or system from temperature, humidity, excess current or excess loading, […]

Filed Under: Featured, Power Electronic Tips Tagged With: basics, FAQ, littelfuse, onsemiconductor

Component Obsolescence: more than a case of “you might also like…”

September 18, 2017 By Chris Francis Leave a Comment

component obsolescence

I have faced the problems of component obsolescence from my very early experiences of electronics design. In some cases it can be trivial — a transistor being discontinued and a suitable alternative easy to find. However, that is not always the case. Even a simple transistor replacement could result in PCB changes being necessary if […]

Filed Under: Analog ICs, Featured, Industry Experts, Microcontrollers

Top 10 Electronics Inventions

August 18, 2017 By Chris Francis 2 Comments

I don’t mean the transistor radio or mobile phone, but electronic devices and circuits that have been significant and enduring. Some are not necessarily “inventions”, depending on how you define an invention, but significant designs, devices or techniques. It will depend on your area of interest (and age). You might think the GaAsFET was the […]

Filed Under: Amplifiers, Analog ICs, Featured, Industry Experts, Microcontrollers Tagged With: texasinstrumentsinc

Mechanical vibration for electronics: the quartz crystal

August 14, 2017 By Chris Francis Leave a Comment

It is now 100 years since Alexander Nicholson at Bell Telephone Laboratories built and patented the first crystal oscillator, and crystals are still the main source of accurate oscillations up to UHF frequencies using quartz instead of Rochelle Salt (see US patent 2212845). Quartz crystal oscillators use the piezoelectric effect. The piezoelectric effect refers to […]

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

The importance of Fourier Transforms

August 7, 2017 By Chris Francis Leave a Comment

Fourier transforms

I have mentioned Fourier transforms in other posts but it is probably worthwhile explaining more about Fourier transforms in order to show why I think they are so important to analog signal processing. You may come across several theorems containing the name “Fourier” such as the Fourier Series, Fourier Transform, Fourier Integral and Fourier Analysis. […]

Filed Under: Analog IC Tips, FAQ, Featured, Industry Experts Tagged With: basics, FAQ

Not to be forgotten: the simple, bipolar SCRs and TRIACs

July 17, 2017 By Chris Francis Leave a Comment

Thyristors or silicon controlled rectifiers (SCRs) and TRIACs are simple bipolar devices which probably get forgotten in this high-tech, CMOS, MOSFET, digital world. A thyristor is a PNPN bipolar device, compared to a normal bipolar transistor which will be PNP or NPN. A common way of explaining their operation is to visualize the thyristor as […]

Filed Under: Featured, Power Electronic Tips Tagged With: basics, FAQ, onsemiconductor

Put your finger on it: capacitive touch switching

July 5, 2017 By Chris Francis Leave a Comment

capacitive touch

Rather than a physical switch it is now common to use “touch” switches to interface to many types of electronic equipment. Smartphones are an obvious example but touch switches are now in cars, oscilloscopes, ovens and many other types of industrial and consumer electronics. A touch screen will usually be a specialized screen with a […]

Filed Under: Analog ICs, FAQ, Featured, Industry Experts, Sensors Tagged With: basics, FAQ, Fujitsu, onsemiconductor, texasinstrumentsinc

Power Status: battery monitors matter

June 13, 2017 By Chris Francis Leave a Comment

For battery powered systems it can be useful to know something about the state of the battery in order to predict remaining battery life. With specific charge/discharge information, you could also manage battery consuming resources to maximize battery life. There are integrated circuits to help with either approach. For simple charge or discharge information, a […]

Filed Under: FAQ, Featured, Power Electronic Tips Tagged With: basics, FAQ, lineartechnology, maximintegratedproducts

Are your op amps pumped?

May 29, 2017 By Chris Francis

I was recently thinking about the issues surrounding rail to rail input opamps and the problems of making them low distortion – a problem I have had to overcome when designing integrated circuits for instrumentation applications. Some rail to rail opamps use two input stages – one using NMOS input transistors, the other using PMOS […]

The post Are your op amps pumped? appeared first on Analog IC Tips.

Filed Under: Amplifiers, Analog IC Tips, Analog ICs, FAQ, Featured Tagged With: basics, FAQ

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