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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
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.
Amplify small signals in low-noise circuit with discrete JFET
https://www.planetanalog.com/amplify-small-signals-in-low-noise-circuit-with-discrete-jfet/
A discrete JFET such as TI’s JFE150, when followed by a bipolar op amp such as the OPA202, does offer a way to achieve high input impedance and low noise with flexible biasing ( Figure 1 ). Figure 1 The JFET pre-amplifier closed-loop circuit facilitates low noise with flexible biasing. Source: Texas Instruments.
Simple 60dB discrete low noise amplifier (lna) | diyAudio
https://www.diyaudio.com/community/threads/simple-60db-discrete-low-noise-amplifier-lna.165961/
If you want to measure noise with this amplifier, consider using 10,000uF for C3. This cap sets the lower cutoff. I measured the noise of the amplifier at just under 1nV/RtHz. Unless you're at the Lawrence Livermore Laboratories, running out the noise statistics to 3 significant places is just silly. It's stochastic!
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