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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 …
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
Amazon.com: low noise amplifier
https://www.amazon.com/low-noise-amplifier/s?k=low+noise+amplifier
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
Ultra low noise amplifiers - Dicks-website
http://dicks-website.eu/low_noise_amp_part3/part3.html
60 dB Low Noise Audio Amplifier - jensign.com
https://www.jensign.com/60dBLowNoiseAudioAmplifier/index.html
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. (The circuit could be easily duplicated in each half of the dual circuit for stereo …
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
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
of F. t It is important to notice that the noise generated by the amplifier can be formally represented as being due to a generator VN2/A connected in series with the signal input. As a practical guide, we may regard any system having a noise figure of 3 dB or better (F z 2) as being a low-noise system. 2.2. Models oJ Noisy Amplifiers
Richard Lee's Ultra low Noise MC Head Amp - diyAudio
https://www.diyaudio.com/community/threads/richard-lees-ultra-low-noise-mc-head-amp.339246/
Their advantage is for cartridges with DC less than 4R3 where you can run more than 3mA up to 5mA. (The older Unobtainium d786/b737 et al don't improve noise above 3mA cos their rbb' becomes dominant.) Best of all, ZTX851/951 don't come from Ye Olde Unobtainium Shoppe For best real life performance, it is important to match the amp to the cartridge. This …
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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