Veljko Radeka: Notes on the origin of charge amplifiers July2, 2014 1.

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Presentation transcript:

Veljko Radeka: Notes on the origin of charge amplifiers July2,

The first record of a Charge-Sensitive Amplifier Circuit Classical “integrator” known from WWII (1941-5,) appears as charge amplifier in ~1950-ies (Gatti, et al.): Input capacitance ~ open-loop gain x C f 1948 Vacuum tube at the input until ~1963 when the first JFET is used … CfCf CfCf

The “last word” from vacuum tubes – introducing Ge detectors (Tavendale,1963) 3 Noise: ~200 e rms at 20pF, 1-2 μs The Cascode! Feedback Original charge preamp with JFET, 1968

From: V. Radeka “State of the art of low noise amplifiers for semiconductor radiation detectors” Proc. Intern. Symp. Nuclear electronics, vol. I (1968), p. 46.1, 28