Measuring and determining 1/f voltage noise over a multiple-year sample requires an operational amplifier and effective 1/f knowledge. This article shows how to identify and determine the actual op amp 1/f voltage noise across a sample size of years and explains why the 1/f voltage noise is a non-issue at higher frequencies. After many years […]
Amplifiers
Input-Protected LNAs cover 1 to 23 GHz range
Fairview Microwave Inc. has just unveiled a new series of Low Noise Amplifiers (LNAs) that are perfect for use in electronic warfare, radar, space systems, R&D, prototype/proof of concept, ECM, microwave radio, VSAT, SATCOM, and test & measurement applications. Fairview Microwave’s new series of input-protected LNAs feature Gallium Nitride (GaN) semiconductor technology which provides robust input […]
Understanding the lock-in amplifier, Part 1: The sensing challenge
The lock-in amplifier allows tiny signals from sensors to be captured with precision despite unavoidable noise limitations and other signal-chain test and measurement challenges. There are some basic test and measurement instruments common to scientific labs and engineering benches of all types, whether electronic, biomedical, chemical, optical, or mechanical. Among these are the digital voltmeter, […]
Improving transimpedance amplifiers with a bootstrap
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 […]
Smart, Class D amplifier boost audio in speaker mode
As consumers increasingly turn to their phone’s internal speakers to enjoy music, podcasts, movies and gaming, Cirrus Logic has introduced its newest flagship CS35L45 boosted amplifier for a richer, more immersive audio experience from smartphones, tablets and mobile gaming devices. Cirrus Logic’s CS35L45 smart power amp delivers higher excursion for high-peak loudness, improved dynamic range […]
What is the difference between current feedback and voltage feedback op amps?
Current feedback (CFB) operational amplifiers (op amps) and voltage feedback (VFB) op amps have almost as many similarities as differences. CFBs and VFBs both have inverting and non-inverting inputs, a signal output, inputs for positive and negative voltage supplies and use feedback and gain resistors to stabilize circuit operation and set circuit gain. That can […]
Two-channel, high-speed op amps feature slew rates to 10V/µs
ROHM announced the availability of a two-channel, high-speed, ground sense CMOS operational amplifier (op-amp), BD77502FVM, optimized for consumer and industrial equipment requiring high-speed sensings – such as industrial measurement and control systems. The proliferation of the Internet of Things (IoT) in recent years has led to a significant increase in the number of electronic components used for […]
Designing a DAC-controlled, high-side constant current source
by KlausST, supermoderator on EDABoard.com Here I’d like to show how to design a DAC controlled high -side constant current source. Since it is often used as 0..20mA (or 4..20mA) current loop interface, we will focus on the interface requirements. * low speed ( maybe some 10Hz up to some kHz) * high precision * […]
Dual 5-V op amp sports 50-MHz gain-bandwidth, low input offset voltage, 6.5 nV/√Hz input voltage noise
STMicroelectronics’ TSV792 dual 5V operational amplifier (op-amp) combines 50MHz gain-bandwidth with precision attributes including low input offset voltage and extremely low input voltage noise of just 6.5nV/√Hz. The typical 50MHz gain-bandwidth product enables accurate amplification of high-frequency signals. Adding a fast slew rate of 30V/µs, the TSV792 is suited to photodiode-signal conditioning in battery-powered smoke detectors. […]
LNA offers 15-dB typ gain over up to 170 GHz
For the emerging number of millimeter-wave applications above 100 GHz, the model ITI-110-170-15-6 low-noise amplifier (LNA) from Impulse Technologies offers 15-dB typical gain over the wide frequency range of 110 to 170 GHz. It features a typical noise figure of 6 dB over that high-frequency range. The broadband LNA is equipped with UG-387 as the […]
