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 […]
Amplifiers
When is a high CMRR needed in an op amp?
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 […]
What is PSRR and why is it important in op amps and LDOs?
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 […]
Infineon’s latest class D audio module delivers higher output power, smaller footprint
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 […]
Precision P-Channel MOSFET array designed for extremely low power, mostly-on apps
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. […]
Class-D stereo amplifier drives 12 W and 4Ω speakers
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 […]
Rail-to-rail input/output high-speed CMOS op amps target automotive, industrial apps
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 […]
Squash 1/f noise with zero-drift amplifiers
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 […]
Negotiate through 1/f noise challenges towards sample sizes into the 100s of years
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 […]
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 […]
