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Amplifiers

Where do you use A, B, AB, D, G, DG and H circuits?

April 29, 2022 By Jeff Shepard

This selection of power amplifier classes is used to strengthen AC signals. The letter symbols differentiate between amplifier types and indicate the expected performance and characteristics. Basic amplifier classes such as A, B, AB, and C relate to the time that the amplifier is operating, or conducting, expressed as a fraction of the period of […]

Filed Under: Amplifiers, FAQ, Featured, Products Tagged With: FAQ

When is a high CMRR needed in an op amp?

April 19, 2022 By Jeff Shepard

Common mode rejection ratio (CMRR), also called common mode rejection (CMR), quantifies the ability of an operational amplifier (op amp) to reject common-mode signals. Common-mode signals are signals that appear simultaneously and in phase on both inputs. This FAQ begins by defining what CMRR is and how it’s quantified, reviews some design considerations related to […]

Filed Under: Amplifiers, Analog ICs, FAQ, Featured, Products Tagged With: FAQ

What is PSRR and why is it important in op amps and LDOs?

April 18, 2022 By Jeff Shepard

The power supply rejection ratio (PSRR) describes the ability of a circuit to suppress any power supply variations from passing to its output signal and is typically measured in dB. It’s most often used with operational amplifiers (op amps), dc/dc converters, linear regulators, and low drop out regulators (LDOs). For op amps, the PSRR describes […]

Filed Under: Amplifiers, Automotive, FAQ, Featured, Industrial, Medical, Products Tagged With: FAQ

Infineon’s latest class D audio module delivers higher output power, smaller footprint

February 22, 2022 By Redding Traiger

Class D audio power amplifiers offer a combination of small size, low heat dissipation, high integration, and excellent sound quality. Unlocking the potential of its best-in-class power MOSFET technology, Infineon Technologies AG introduces the MERUS 2-channel, analog input, class D audio amplifier multichip module (MCM) MA5332MS. It is a powerful upgrade to its predecessor, offering the same […]

Filed Under: Amplifiers, Audio, Consumer, Industrial, Products, Tools Tagged With: infineon

Precision P-Channel MOSFET array designed for extremely low power, mostly-on apps

January 26, 2022 By Lee Teschler

ALD

The first-to-market nano-power precision P-Channel EPAD MOSFET array comprises a matched-pair circuit is designed for the next generation of products requiring extremely low power applications and mostly-on operation. This MOSFET simplifies bias circuitry while optimizing power usage. Market segments using the MOSFET array are energy harvesting systems, automotive, medical, transportation, robotics, and any wireless product. […]

Filed Under: Amplifiers, Products Tagged With: advancedlineardevices

Class-D stereo amplifier drives 12 W and 4Ω speakers

October 13, 2021 By Redding Traiger

Diodes Incorporated introduces the PAM8965 Class-D stereo audio power amplifier with an integrated synchronous boost converter. This high-efficiency device is targeted for use in AI-enabled speaker systems and portable musical instruments – where elevated output power, extended battery life, and compact construction are all key requirements. Running off a 2.8V to 8.5V supply, the PAM8965 has […]

Filed Under: Amplifiers, Applications, Artificial Intelligence, Audio, PCB design, Products, Tools Tagged With: diodesinc

Rail-to-rail input/output high-speed CMOS op amps target automotive, industrial apps

August 16, 2021 By Redding Traiger

ROHM Semiconductor announced the BD8758xY series (BD87581YG-C, BD87582YFVM-C) of rail-to-rail input/output high-speed CMOS op-amps. The devices feature improved EMI immunity for automotive and industrial equipment applications requiring high-speed sensing in harsh environments, such as vehicle engine control units and anomaly detection systems for factory automation equipment. In recent years, advancements in electrification and mounting density have […]

Filed Under: Amplifiers, Applications, Audio, Automotive, Industrial, Products, Tools Tagged With: rohmsemiconductor

Squash 1/f noise with zero-drift amplifiers

August 11, 2021 By Bonnie Baker

There is a device that squashes all the 1/f voltage and current noise calculations with a chopper amplifier algorithm that corrects offset and drift characteristics. These amplifiers are zero-drift, auto-zero, or choppers that all achieve nanovolt-level offsets and extremely low offset drifts due to time and temperature. But back to our noise discussion, these devices […]

Filed Under: Amplifiers, FAQ, Featured, mixed-signal Tagged With: FAQ

Negotiate through 1/f noise challenges towards sample sizes into the 100s of years

July 12, 2021 By Bonnie Baker

1/f noise

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 […]

Filed Under: Amplifiers, Analog ICs, FAQ, Featured, Products, Resistors Tagged With: FAQ

Input-Protected LNAs cover 1 to 23 GHz range

June 15, 2021 By Redding Traiger

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 […]

Filed Under: Aerospace & Defense, Amplifiers, Applications, Tools Tagged With: fairviewmicrowaveinc

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