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Ultra low noise amplifiers - JanasCard
http://www.janascard.cz/PDF/Design%20of%20ultra%20low%20noise%20amplifiers.pdf#:~:text=Op%20amplifiers%20%28OA%29%20are%20widely%20used%20as%20AC,distortion.%20Maxim%20%28www.maxim%E2%80%93ic.com%29%20offers%20MAX9632%20withnoise%20bellow%201nV%2F%E2%88%9AHz.
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
OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, …
https://www.ti.com/lit/ds/symlink/opa1656.pdf
OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, Burr-Brown™ Audio Operational Amplifiers 1 Features • Ultra-low noise: – Voltage noise: 2.9 nV/√Hz at 10 kHz – Current noise: 6 fA/√Hz at 1 kHz • Low distortion: – 0.000029% (–131 dB) at 1 kHz – 0.000035% (–129 dB) at 20 kHz • High open-loop gain: 150 dB
Ultra low noise amplifiers - Dicks-website
http://dicks-website.eu/low_noise_amp_part3/part3.html
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 …
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
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 …
OPA1656 data sheet, product information and support | …
https://www.ti.com/product/OPA1656
Ultra-low noise: Voltage noise: 2.9 nV/√ Hz at 10 kHz; Current noise: 6 fA/√ Hz at 1 kHz; Low distortion: 0.000029% (–131 dB) at 1 kHz; 0.000035% (–129 dB) at 20 kHz; High open-loop gain: 150 dB; High output current: 100 mA; Low input bias current: 10 pA; Slew rate: 24 V/µs; Gain bandwidth product: 53 MHz; Rail-to-rail output
Ultra Sound Amplifier 30x with minimal back noise ...
https://expresshearingstore.com/product/ultra-sound-amplifier/
Ultra Sound Amplifier 30x with minimal back noise $ 51.27 $ 11.56 Sound amplifier helps to amplify sound by up to 30x with minimal background noise. Features an inbuilt battery which is convenient for recharging. Fully charged …
A very low-noise FET input amplifier - NIST
https://tf.nist.gov/general/pdf/821.pdf
A low-noise amplifier has been designed utilizing a Toshiba 2SK117 N channel J-FET' as the input device in a cascode' configuration. Noise measurements on this amplifier yield a low-frequency noise current of 0.25 fA/m and a voltage noise of less than 1.2 nV/m in the 500 Hz to 500 kHz region. Bloyet, Lepaisant, and Varoquaux3 suggest a figure
ultra-low noise transistors. - diyAudio
https://www.diyaudio.com/community/threads/ultra-low-noise-transistors.17285/
If you are looking for ultra low voltage noise (2 ohm base resistance), BFG16A (SOT223A) or BFQ17 (SOT89) might be interesting. Mind you, hFE is not very high and as far as I remember the 1/f corner is not particularly low, so these are not the right transistors if you want low current noise. See www.semiconductors.philips.com for more info.
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