Abstract
For the electromagnetic calorimeter of the PANDA detector a preamplifier ASIC named APFEL (ASIC for Panda Front-end Electronics) has been developed at GSI. It is optimized for the readout of large area avalanche photodiodes (LAAPD) with a capacitance of 300 pF and an event rate of 350 kHz. The ASIC has two equivalent analog channels each consisting of a charge sensitive amplifier, a shaper stage and differential output drivers. For operating the ASIC in a wide temperature range programmable voltage references are implemented on chip. The characterization of the third ASIC iteration at a temperature of T = -20° C and a detector capacitance of 300 pF results in an equivalent noise charge of ENC = (0.62 ± 0.03) fC and a maximum input charge of 6.3 pC. Therefore a dynamic range of over 10 000 follows. The peaking time of the shaped signal was measured to t <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> = (248 ± 3)ns. The event rate independent power consumption of one channel is P = (56.5 ± 0.5)mW.
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