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Simple JFET Audio Preamps - Ciphers By Ritter
http://www.ciphersbyritter.com/RADELECT/PREJFET/JFETPRE.HTM#:~:text=The%20best%20JFET%20current%20for%20lowest%20noise%20can,gain%20we%20can%20expect%20from%20the%20second%20transistor.
Low Noise High Gain - JFET - InterFET
https://www.interfet.com/low-noise-high-gain/
Amplify small signals in low-noise circuit with discrete JFET
https://www.planetanalog.com/amplify-small-signals-in-low-noise-circuit-with-discrete-jfet/
The clean roll-off at the corner frequencies provides a natural-sounding filter for audio signals without sounding abrupt at the low and high ends. This closed-loop solution also offers very low input-referred noise of 1.99 …
Lowest Noise JFETs? | diyAudio
https://www.diyaudio.com/community/threads/lowest-noise-jfets.317639/
The low noise was a surprising gift. The device was intended for, and spec'd for, preamplifiers in the MF to HF range. A JFET that is low noise at RF frequencies isn't necessarily low noise at audio frequencies. Unfortunately there was never anything like a complementary device for the BF862.
Low-Noise JFETs Ð Superior Performance to Bipolars
https://www.vishay.com/docs/70599/70599.pdf
Low-Noise JFETs Ð Superior Performance to Bipolars Introduction Junction field effect transistors continue to outperform the best bipolar transistors on low-frequency noise at source impedances as low as 5 k . With higher source impedances, common in sensitive transducers, the JFET amplifiers exhibit dramatically lower noise figures.
Linear Systems Ultra-Low-Noise JFETs
https://www.linearsystems.com/product-spotlight.html
This line of ultra-low-noise JFETs includes: The LSK389. The LSK389 is Linear Systems’ premier ultra-low-noise part. This monolithic, N-Channel dual JFET is available in four Idss grades and is used in a variety of ultra-high-end audio and sensor applications.
JFE150 Ultra-Low-Noise, Low-Gate-Current, Audio, N …
https://www.ti.com/lit/gpn/JFE150
JFE150 Ultra-Low-Noise, Low-Gate-Current, Audio, N-Channel JFET 1 Features • Ultra-low noise: – Voltage noise: • 0.8 nV/√Hz at 1 kHz, IDS = 5 mA • 0.9 nV/√Hz at 1 kHz, IDS = 2 mA – Current noise: 1.8 fA/√Hz at 1 kHz • Low gate current: 10 pA (max) • Low input capacitance: 24 pF at …
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
Simple JFET Audio Preamps - Ciphers By Ritter
http://www.ciphersbyritter.com/RADELECT/PREJFET/JFETPRE.HTM
Low Current: Typically under 2mA down to 0.5mA or less. High Input Impedance: JFET input. Low Output Impedance: Emitter-follower output. Low Noise: A single input transistor instead of a differential pair. Wide Bandwidth: Typically to 100kHz. Fixed Known Gain and Low Distortion: Here 30dB and set by feedback.
Ultra low noise amplifiers - JanasCard
http://www.janascard.cz/PDF/Design%20of%20ultra%20low%20noise%20amplifiers.pdf
very low noise IF9030 and IF3601 with noise density 0.5 and 0.3 nV/√Hz respectively and low 1/f corner, but they have large capacitances and they are quite expensive, so using more BF862 in parallel may be a better option. Fig. 4. shows an ultra-low noise amplifier with two JFETs 2SK170 with gain 100 and voltage noise density bellow 0.7nV/√Hz.
OPA165x Ultra-Low-Noise, Low-Distortion, FET-Input, …
https://www.ti.com/lit/ds/symlink/opa1656.pdf
The FET-input architecture achieves a low 2.9‑nV/√Hz voltage noise density and 6‑fA/√Hz current noise density, allowing for very-low noise performance in a wide variety of circuits. The high bandwidth and high open-loop-gain design of the OPA165x delivers a low distortion of 0.000035% (–129 dB) at 20 kHz, and improves audio signal fidelity across the full audio bandwidth.
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