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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 …
60 dB Low Noise Audio Amplifier - jensign.com
https://www.jensign.com/60dBLowNoiseAudioAmplifier/index.html
60 dB Low Noise Audio Amplifier Nov 05, 2020 The circuit below is a low noise low distortion 60 dB (Av=1000) gain block that can be used as an audio preamplifier for very low signal or noise measurements. A high performance LM4562NA dual op-amp is used. Each half of the op-amp uses a different circuit to demonstrate different usage.
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."
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
Choosing a Low-Noise Amplifier - Maxim Integrated
https://www.maximintegrated.com/en/design/technical-documents/app-notes/3/3642.html
Bipolar amplifiers have traditionally been the most common low-noise amplifiers. Low-noise bipolar amplifiers such as the MAX410 offer very low-input voltage-noise density (1.8nV/) with a relatively high-input current-noise density (1.2pA/ ). Unity-gain bandwidths are typically less than 30MHz for these amplifiers.
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