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When employed in the input stage of an operational amplifier at ambient temperatures below roughly , junction field effect transistors can produce exceptionally low input currents.
However, there are currently no monolithic FET amplifiers on the market since it is difficult to distribute high-quality FETs on the same chip as the amplifier.
However, it is feasible to build a reliable FET amplifier utilising a discrete FET pair and a monolithic circuit. A matched FET pair is connected as source followers in front of an integrated operational amplifier in the circuit schematic below
The Global FET-input operational amplifier market accounted for $XX Billion in 2021 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2022 to 2030.
Digital Devices For high speed applications, high input impedance and extremely low input bias currents are provided by JFET input op amps or FastFET high speed (>50 MHz) input op amps.
The majority of FET input op amps include rail-to-rail outputs that enable a wide dynamic range and wide supply ranges from +5 V to 12 V or higher.
The LTC6268 has a sub-pF input capacitance, a 500MHz gain bandwidth product, and a -100dB harmonic distortion at 1MHz.
The LTC6268/9 are well suited for driving analog-to-digital converters and other high impedance sensor applications in addition to photodiode and photomultiplier circuits (ADCs).
In amplifier circuits, the FET amplifier has significant advantages over the bipolar transistor. For instance, the approaches used to build the circuits are identical to, or nearly identical to, those often used for BJT circuits.
Additionally, the high input impedance of the FET permits the standard flowing of RC-couple stages with no gain loss between stages.
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