A MULTICHANNEL INTEGRATED-CIRCUIT FOR THE READOUT OF A MICROSTRIP GAS CHAMBER

The design and test of an 8 channel integrated circuit for the readout of the microstrip gas chamber and other multielectrode detectors are described. The circuit is composed of 8 identical channels, each providing the amplification and the shaping of the signal delivered by the detector. The peaking time of the shaper is 25 ns and the overall amplifier gain is 8 mV/1000 e-. In addition to the analog output, each channel provides a TTL compatible digital output. The equivalent input noise is less than 700 e- rms and the total dc power consumption is about 5 mW/channel. To avoid a baseline shift due to the tail of the current issued from the detector, an adjustable pole-zero cancellation circuit has been included.