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basics

Analog filters

June 16, 2014 By Chris Francis

Analog FiltersTH

Filters are an important part of analog design. Even circuits that you don’t think of as filters are actually filters. For example, a simple amplifier will have a bandwidth and so above its upper 3dB point it is a low pass filter. Whole books have been written on filters and filter design, both analog and […]

Filed Under: FAQ, Industry Experts, Products, Tools Tagged With: basics, FAQ

Transimpedance amplifier signal-to-noise

June 5, 2014 By Chris Francis

transimpedance amplifier

The use of opamps as a transimpedance amplifier is well known and a good analysis of the noise behavior of them is in the old Burr Brown Application Bulletin AB-076 from 1994. This is still available from Texas Instruments’ web site as sboa060 – simply search for that on their web site (Texas Instruments acquired Burr […]

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

What is a cascode amplifier?

May 23, 2014 By Chris Francis

cascode amplifier

I am not sure how “fashionable” discrete transistor design is nowadays, but anyone using discrete transistors, bipolar or otherwise, for high speed designs other than for switching probably knows about cascode designs. The purpose of a cascode amplifier (not to be confused with cascade which is a chain of two or more amplifiers) is to […]

Filed Under: FAQ, Industry Experts, Interface & Isolation, Products Tagged With: basics, cascode design, FAQ

5 ways to generate a sine wave

March 21, 2014 By Chris Francis

generate a sine wave

It is not uncommon to need a sine wave but how do you generate it? The “best” or most appropriate method for a particular application depends on several things such as: frequency, purity required, amplitude, possible synchronization with another frequency, variable frequency and/or amplitude. At lower frequencies a Wien bridge might be considered – for […]

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

Input bias current cancellation in bipolar op amps

February 3, 2014 By Chris Francis

bipolar op amps

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, Industry Experts, Products Tagged With: basics, FAQ

Improving transimpedance amplifiers with a bootstrap

December 15, 2013 By Chris Francis

transimpedance amplifiers

Analog bootstrap circuits are traditionally ones where an 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 […]

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

Open loop gain: how to measure with SPICE

November 14, 2013 By Chris Francis

open loop gain

When designing opamps in analog IC design, it is frequently required to plot the open loop gain/phase. One way of doing that is to use a high feedback resistor and very high capacitance so the feedback network has an extremely low corner frequency: This works fine unless your opamp drive capability is low, in which […]

Filed Under: Applications, FAQ, Industry Experts Tagged With: basics, FAQ, op amp, open loop, spice

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