Charge amplifier with automatic zero

Details Charge amplifier with automatic zero Charge amplifier with automatic zero

H - Electricity

03

F

330/108, 330/34

H03F 1/56 (2006.01) H03F 3/45 (2006.01) H03F 3/70 (2006.01)

Patent

CA 1207395

ABSTRACT OF THE DISCLOSURE A charge amplifier includes an operational amplifier having first and second voltage dividers across its output connected to a capacitor and a resis- tor, respectively, in an R-C network returned to one input for magnifying the apparent values of the capaci- tor's impedance and the resistor. Its output is also connected to an integrating network including another operational amplifier having its output supplied to a third voltage divider supplying signal to another input of the first operational amplifier. A pair of differ- entially coupled piezoelectric charge sources supply signal to the amplifier through filters and the second voltage divider has a portion shunted by a parallel connection of back-to-back diodes and another resistor for effectively attenuating response to low frequency signals.

477134

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