When a semiconductor detector such as Silicon is used for the measurement of particles in nuclear reactions in different experiments, the output signal is a weak charge pulse having a pulse width of several nanoseconds. As the detector element itself is a capacitive device, its impedance is very high. Therefore, the performance of the preamplifier to be connected must be taken into consideration when amplifying this output signal.

In such application, operational amplifier mode integrators using feedback capacitance are commonly used. As these amplifiers have high input impedance, they integrate weak charge pulses and convert them into voltage pulses for amplification then provide a low-impedance output.

Because of this operation, Tharsis Technology provides this type of amplifier, called a “charge and current-sensitive preamplifier”. The first stage of the preamplifier is usually a low-noise FET and its open-loop gain is set sufficiently high so that the amplification is not influenced by the detector capacitance. The preamplifier has two outputs: Charge and Current. 

Features: TT-Preamp

TT-PREAMP Box.

Charge (blue) and Current Signal Outputs.

Different versions available:

And for multichannel preamplifiers: