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Measured characteristics of BeetleFE 1.0 Set 4 (nmos)

Measured frontend noise of the BeetleFE 1.0 - Set 4 - at different bias settings Ipre (=bias current of the preamplifier).

Noise measurment for Ipre=350uA Noise measurment for Ipre=600uA

The table below shows the measured pulse shape characteristics of the BeetleFE 1.0 Set 4 frontend. The bias settings Ipre (the preamplifier bias current), vfs (the feedback resistor bias voltage of the shaper) and the capacitive load were systematically changed.

Iprevfsgain/1MIPrisetimeremainder@25nsundershoot
Cload = 0pF
350uA0V20.5mV21.2ns1mV1.6mV
350uA0.5V22.7mV22ns01.3mV
350uA1V26.8mV26.4ns12.9mV0
350uA1.5V34.8mV35.6ns31.6mV0
500uA0V19.9mV22ns1.4mV1.4mV
500uA0.5V22.4mV22.4ns4.9mV1.2mV
500uA1V25.9mV27.6ns12.9mV0mV
500uA1.5V34.5mV38ns31mV0mV
Cload = 10pF
350uA0V13.6mV28ns5mV0mV
350uA0.5V17mV33ns8mV0mV
350uA1V23mV41ns15mV0mV
350uA1.5V35mV58ns30mV0mV
500uA0V14.2mV26ns4.8mV0mV
500uA0.5V17.4mV32ns7.6mV0mV
500uA1V23.6mV38ns15mV0mV
500uA1.5V35mV55ns30mV0mV
Cload = 20pF
350uA0V12.2mV29ns5mV0mV
350uA0.5V14.8mV34ns7.6mV0mV
350uA1V20.8mV43ns13mV0mV
350uA1.5V35mV65ns33mV0mV
500uA0V13mV29ns4.9mV0mV
500uA0.5V16mV33ns8mV0mV
500uA1V22mV41ns14mV0mV
500uA1.5V37mV65ns33mV0mV
Cload = 40pF
350uA0V9.6mV33ns4.6mV0mV
350uA0.5V12.8mV37ns6.3mV0mV
350uA1V17.3mV45ns12mV0mV
350uA1.5V34.8mV78ns33mV0mV
500uA0V11.1mV32ns4.8mV0mV
500uA0.5V13.6mV36ns7.smV0mV
500uA1V19.4mV46ns14mV0mV
500uA1.5V39mV76ns37mV0mV
   
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Letzte Änderung: 3 Sep 2001