Abstract
The design and results of a radiation hard switched gain charge amplifier optimised for a large dynamic range and large input capacitance are described. The peaking time is 25 ns , dynamic ranges are 0.1–50 minimum ionising particles (MIPs) (high gain) and 1–400 MIPs (low gain), signal to noise ( S/ N)>10 for C in <56 pF and radiation tolerance to 10 Mrads(Si) and 4×10 13 n cm −2 .
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