| 摘要 |
The invention relates to a charge amplifier circuit with a control loop for resetting, which for minimizing the leakage currents that falsify the measuring results includes two diodes (D1) and (D2), connected antiparallel in the loop and constituting input protection diodes of an integrated circuit (ISK). In the operating (measuring) phase the diode resistance (RD) is extremely high and the voltage drop over the diode pair is small, so that no significant leakage current gets through onto the charge amplifier input INQ. In the reset phase the diode resistance (RDr) is practically nil.
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