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The Design of Low-noise Audio-frequency Amplifiers
http://www.keith-snook.info/Stuff-you-should-read/Faulkner%20-%20The%20design%20of%20Low-noise%20audio%20frequency%20amplifiers.pdf
noise current less than 4kTl1f/R (it may develop more noise if it has direct current flowing through it) and accordingly it is not possible for an amplifier to give a noise figure close to unity unless its passive input resistance is substantially greater than …
Ultra low noise amplifiers - JanasCard
http://www.janascard.cz/PDF/Design%20of%20ultra%20low%20noise%20amplifiers.pdf
Various types of ultra-low noise amplifiers both for DC and AC signals are described. “Ultra-low noise” here means that voltage noise density is bellow 1 nV/√Hz for AC amplifiers or noise less than 100 nVpp for DC amplifiers. 1. Ultra–low noise AC amplifiers Op amplifiers (OA) are widely used as AC amplifiers. For ultra-low noise amplifiers are
Low-Noise Amplifiers - LNA Design | Maxim Integrated
https://www.maximintegrated.com/en/products/comms/wireless-rf/low-noise-amplifiers-lnas.html
In wireless applications, a low-noise amplifier (LNA) is an active network that increases the amplitude of weak RF signals to allow processing by a receiver. In a receiver chain, the first amplifier after the antenna contributes the most to the system noise figure.
10 Practical Considerations for Low Noise Amplifier Design
https://www.wellpcb.com/low-noise-amplifier-design.html
The primary function of a low noise amplifier is to amplify small power signals. In an electronic microphone, the message can either be voltage or current, variable w.r.t. Time. Like all amplifiers, the low noise amplifier is also a two-port circuit. It consumes electric power to enhance the input signal’s amplitude.
MOSFET AUDIO AMPLIFIER(Low Noise and High Gain) : 6 …
https://www.instructables.com/MOSFET-AUDIO-AMPLIFIERLow-Noise-and-High-Gain/
"An audio power amplifier (or power amp) is an electronic amplifier that strengthens low-power, inaudible electronic audio signals such as the signal from radio receiver or electric guitar pickup to a level that is strong enough for driving loudspeakers or headphones."
Low Noise Op Amps (≤ 10nV/√Hz) - Analog Devices
https://www.analog.com/en/products/amplifiers/operational-amplifiers/low-noise-op-amps-lessthanequalto-10nv.html
Low Noise Op Amps (≤ 10nV/√Hz) Analog Devices’ portfolio of low noise (≤ 10nV/√Hz) op amps includes many amps with the lowest noise performance in the industry. These high speed, low distortion (1 nV or less) op amps enable better signal fidelity in the most demanding conditions, allowing system designers to achieve the lowest total system noise performance in …
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