New FEMTO Current Amplifier with 400MHz Bandwidth Jan 3, 2008

This latest addition to the popular HCA series of fast current amplifiers offers a bandwidth of DC to 400MHz for amplification of current signals with rise times down to 1ns. The gain of 5 x 103 V/A allows sensitive measurements down to ca. 4µA. An integrated offset control allows the compensation of unwanted offset currents which might be superimposing the signal. Due to the real DC coupling accurate measurements of pulses and digital codes can be performed without unwanted signal over/undershoots and baseline drift which can occur with AC coupled amplifiers. For use with external photodiodes an adjustable output voltage is provided which allows biasing the detector for higher speed and improved noise performance. The compact and well shielded metal housing allows use of the amplifier close to the signal source to prevent noise pickup and signal degradation due to long cables.
Features

• Bandwidth DC….400MHz
• Rise / Fall time 1ns
• Transimpedance (Gain) 5 x 10^3 V/A
• Optimised for low Pulse Distortion - Almost no overshoot or ringing will occur

Applications
• Photodiode and Photomultiplier Amplifiers
• Spectroscopy
• Ionisation Detectors
• Preamplifier for A/D Converters , digitisers etc
• Ideal for analysing digital signals (no baseline shift at any digital code)

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