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Charge amplifier
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<p>A charge amplifier is an electronic <a href="/facts/Electric_current/Dc1xdnUX">current</a> <a href="/facts/Integrator/VTqXQuQU">integrator</a> that produces a voltage output proportional to the integrated value of the input current, or the total charge injected. </p> <p>The amplifier offsets the input current using a feedback reference capacitor, and produces an output voltage inversely proportional to the value of the reference capacitor but proportional to the total input charge flowing during the specified time period. The circuit therefore acts as a charge-to-voltage converter. The gain of the circuit depends on the values of the feedback capacitor. </p><p>The charge amplifier was invented by <a href="/facts/Walter_Kistler/fGU8hftB">Walter Kistler</a> in 1950. </p>