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Audio Amplifiers - JFET - InterFET
https://www.interfet.com/audio-amplifiers/
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.
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)
Low-Noise JFETs Ð Superior Performance to Bipolars
https://www.vishay.com/docs/70599/70599.pdf
impedances, common in sensitive transducers, the JFET amplifiers exhibit dramatically lower noise figures. A close examination of bipolar and JFET specification and typical curves, along with circuit breadboarding, will startle most designers. Many currently available JFET devices offer ultra-low noise performance over a wide range of operating condi-
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.
Linear Systems Ultra-Low-Noise JFETs
https://www.linearsystems.com/product-spotlight.html
Linear Systems Ultra-Low-Noise JFETs. Linear Systems presents a full line of single, dual, N-Channel and P-Channel ultra-low-noise JFETs to create low-noise, high-performance applications ranging from sensors to audio amplifiers. Members of the company’s design and production staff each have over 40 years’ experience making these parts, and as a group they are the most …
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.
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.
Ultra low noise amp with JFET's - How to reduce the THD ...
https://www.diyaudio.com/community/threads/ultra-low-noise-amp-with-jfets-how-to-reduce-the-thd.167189/
Read many papers and threads about that topic and built up several little amps with low noise JFET's like 2SK170, 2SK369 and IF3601. I use them in source mode going into a non-inverting Opamp LT1028 as second stage. My noise values and bandwith are good.. reached like 0,3 nV/rtHz and bandwith up to 1 MHz.
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