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Amplify small signals in low-noise circuit with discrete JFET
https://www.planetanalog.com/amplify-small-signals-in-low-noise-circuit-with-discrete-jfet/#:~:text=A%20discrete%20JFET%20such%20as%20TI%E2%80%99s%20JFE150%2C%20when,low%20noise%20with%20flexible%20biasing.%20Source%3A%20Texas%20Instruments
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.
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 nV/√Hz in the 1/f region at 10 Hz and 1.18 nV/√Hz in the broadband region at 1 kHz, as shown in Figure 4. Make sure to provide a clean power …
JFE150 Ultra-Low-Noise, Low-Gate-Current, Audio, N …
https://www.ti.com/lit/gpn/JFE150
JFET technologies. The JFE150 offers the maximum possible noise-to-power efficiency and flexibility, where the quiescent current can be set by the user and yields excellent noise performance for currents from 50 μA to 20 mA. When biased at 5 mA, the device yields 0.8 nV/√Hz of input-referred noise, giving ultra-low noise performance with extremely high input …
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 …
Ultra Low Noise JFETs from Texas Instruments | diyAudio
https://www.diyaudio.com/community/threads/ultra-low-noise-jfets-from-texas-instruments.375079/
Some key specs of the JFE150: 1. 0.8 nV/rtHz broadband noise at an IDS of 5mA 2. 10pA of gate current (max), for lower drain-to-source voltages. Gate current takes off above about 5V VDS. This gives 1.8 fA/rtHz input current noise 3. 40V gate to source breakdown voltage 4. 24pF input capacitance (VDS = 5V) 5.
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
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.
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