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Audio Amplifiers - JFET - InterFET
https://www.interfet.com/audio-amplifiers/
N-Channel JFET Low Noise Amplifier - Calogic
http://www.calogic.net/wp-content/uploads/2019/03/2N4338_Datasheet_Rev_A.pdf
N-Channel JFET Low Noise Amplifier 2N4338 – 2N4341 FEATURES •Exceptionally High Figure of Merit •Radiation Immunity •Extremely Low Noise and Capacitance •High Input Impedance APPLICATIONS •Low-level Choppers •Data Switches •Multiplexers and Low Noise Amplifiers ABSOLUTE MAXIMUM RATINGS (TA = 25 oC unless otherwise noted)
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.
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
Linear Systems Ultra-Low-Noise JFETs
https://www.linearsystems.com/product-spotlight.html
The LSK489 is high-performance monolithic dual N-Channel JFET that provides excellent low-noise performance in a design that has very low input capacitance (Ciss). The part is used in many ultra-high- end applications, including in the front-end amplification of the Large Scale Synoptic Telescope (LSST), the world’s largest camera.
An All-JFET Amplifier: Exploring Modern JFETs Circuits ...
https://audioxpress.com/article/an-all-jfet-amplifier-exploring-modern-jfets-circuits
The input stage has low gain (about 6 dB) and thermal noise of drain resistors (R2–R5) makes significant contribution to the amplifier’s total noise. The noise can be reduced by implementing active loads, reducing value of source resistors (R11–R14), by paralleling several JFETs and by using LSK389 with a future dual monolithic 1nV/√Hz low noise, high …
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.
Ultra low noise amplifiers - JanasCard
http://www.janascard.cz/PDF/Design%20of%20ultra%20low%20noise%20amplifiers.pdf
Fig. 4. shows an ultra-low noise amplifier with two JFETs 2SK170 with gain 100 and voltage noise density bellow 0.7nV/√Hz. As with bipolar transistor, T3 can be replaced with OA, but care must be taken because voltage gain of the input stage Au = Yfs * R2 is usually lower than with a bipolar transistor at the same Ic, so a low noise OA must be used.
Simple JFET Audio Preamps - Ciphers By Ritter
http://www.ciphersbyritter.com/RADELECT/PREJFET/JFETPRE.HTM
Here is a tested design for a simple, relatively low-noise, JFET-input, 3-transistor audio preamp, designed to satisfy various goals: Minimum Components: Three amplifying transistors and a few resistors and capacitors. Battery Operation: Use a single 9V battery down to 4V. Low Current: Typically under 2mA down to 0.5mA or less.
MOSFET AUDIO AMPLIFIER(Low Noise and High Gain) : 6 Steps ...
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.". This includes both amplifiers used in home audio systems and musical instrument amplifiers like guitar amplifiers.
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