An Analysis of the Signal-to-Noise Ratio of a Current Amplifier

The signal-to-noise ratio of the current amplifier that includes a differenting delay line (50 ns) and an RC integrator is analyzed. The amplifier is intended for use in conjunction with charge-, curret-, or voltage-pulse detectors, including those with large capacitances or low ohmic resistances. The amplifier and detector can be connected with a long (in this work, up to 100 m) radio-frequency cable. The root-mean-square intrinsic noise charge of the amplifier is 2.8×103 e − when the input is nonloaded and 13.7×103 e − when a 20-meterlong 3 cable is connected to the input. If the charge produced by the detector is constant and the pulse duration decreases, then both the signal-to-noise ratio and the equipment speed performance can be increased.