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Industry Experts

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

Radio receiver architectures, Part 1—TRF and Superhet

December 5, 2017 By Bill Schweber

A transmitter has much-less challenging task than the receiver. The former operates on a higher-level, known signal in a known setting, while the latter must find and decode a largely unknown signal corrupted by internal and external noise, interference from other signals, distortion, low signal levels, and constantly changing parameters. This FAQ looks at the […]

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

RS-232 and related standards, Part 1

November 13, 2017 By Bill Schweber

High-speed, high-performance “just plug and go” wired-communications interfaces such as Ethernet and USB are in wide use. In contrast, the technically ancient RS-232 standard and related standards seem like antique museum pieces with no design-in interest. However, that is a simplistic view of the reality. Although not necessarily the first choice or obvious choice in […]

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

IBIS model: How can it help with signal analysis?

October 4, 2017 By Janet Heath

An Input Output Buffer Information Specification (IBIS) model is a standard in the semiconductor industry for modeling semiconductor devices from a behavioral perspective, for both analog and digital perspectives. IBIS modeling enables engineers to describe detailed signal behavior in a circuit design without revealing proprietary information about the circuits (or the processes used to make […]

Filed Under: Analog ICs, FAQ, Featured, Industry Experts, Simulation Tagged With: basics, cypresssemiconductor, FAQ, texasinstruments

Current feedback amplifiers, Part 2

September 25, 2017 By Bill Schweber

Part 1 of this FAQ look at the operation of the CFB op amp and compared it to the VFB op amp. Part 2 continues the discussion of these two op amp topologies and their characteristics. Q: How do you choose between VFB versus CFB? A: Today’s CFB and VFB amplifiers have comparable performance, but […]

Filed Under: FAQ, Featured, Industry Experts Tagged With: analogdevicesinc, basics, FAQ, lineartechnology, texasinstruments

Current feedback amplifiers, Part 1

September 20, 2017 By Bill Schweber

Almost every engineer who has to deal with real-world signals, analog sensors, front-end circuitry, filtering, line drivers/receivers, or general amplification is familiar with the basic operational amplifier (op amp) which is the building block of most analog circuity. These op amps generally use voltage feedback (VFB), and have been studied and used extensively. However, there […]

Filed Under: Amplifiers, Analog ICs, FAQ, Featured, Industry Experts, Products Tagged With: analogdevicesinc, basics, FAQ, lineartechnology, texasinstruments

Eye and Constellation Diagrams, Pt 2

September 15, 2017 By Bill Schweber

Part 1 looked at the eye diagram, a simple yet powerful visual tool which reveals many specifics about the quality of a recovered bit stream. Part 2 looks at the constellation diagram, another powerful visual tool which is used to show the signal space of complex encoding schemes and relationship among the symbols. Q: Why […]

Filed Under: FAQ, Featured, Industry Experts Tagged With: basics, edaboard.com, 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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