Low noise preamplifier with high input impedance. Scheme, description

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Low noise preamplifier with high input impedance. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Preamplifiers

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At the input of the amplifier, a field-effect transistor is used in a circuit with an OI. The second stage is made on a bipolar transistor according to the scheme with OE. The amplifier has two OOS loops. From the collector of the transistor VT2 through the chain R6, C3, the feedback signal is fed to the source of the field-effect transistor, and from the source through the capacitor C2 and resistor R3 to the gate VT1. The presence of the second OOS allows you to increase the input impedance of the amplifier to tens of megaohms and reduce the input capacitance.

Low-noise, high-impedance preamplifier

The gain can be set from 1 to 100, which also changes the bandwidth. For a gain of 4, the bandwidth is in the range of 100 Hz-40 MHz. Input impedance 30MΩ, maximum output voltage 1,5V.

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