Front-End Electronics (FEE) plays an essential role in MEG Drift Chambers (CYLDCH) for time resolution and, therefore, spatial resolution. The use of cluster timing techniques, by measuring the timing of all the individual ionization clusters after the first one, may enable
to reach resolutions even below 100 μm in the measurement of the impact parameter. To this purpose, a Front End Electronics with a wide bandwidth and low noise is mandatory in order to acquire and amplify the drift chamber signals.
Front End electronics is a multichannel board based on a double stage gain amplifier performed using commercial devices such as ADA4927 by Analog Device and THS4509 by Texas Instruments, providing a bandwidth of the order of 1GHz.
Below a schematic chart of the single channel designed by Pspice simulator
is shown.
Preliminary tests conducted on a small prototype, built at INFN Lecce Laboratory, exhibit a bandwidth around 1 GHz evaluated after a 5 meters long cable (see figure). Pre-emphasis implementation allow to indroduce an high frequency peak to compensate the losses along the output cable.
