CHARGE AMPLIFIER FOR PIEZOELECTRIC DETECTOR (VERSIONS) Russian patent published in 2009 - IPC H03F3/70 H03F3/45 

FIELD: electric engineering.

SUBSTANCE: application: to accord high-resistance inlet of piezoelectric detector and measurement equipment. Charge amplifier for piezoelectric detector comprises operational amplifier, feedback capacitor, feedback resistor, the first and second resistor dividers and limiting unit, the first and second inlets of which are inlets of charge amplifier for piezoelectric detector, common outlets of resistor dividers are connected to common bus bar, between outlet of operational amplifier and outlets of resistor dividers there are accordingly the first and second additional capacitors, product of capacitance value of which by value of appropriate resistor divider resistance between its inlet and outlet is more than value of reverse lower border frequency of charge amplifier for piezoelectric detector, common outlet of the second resistor divider is connected to common bus bar via the third additional capacitor, product of capacitance value of which by value of the second resistor divider resistance between its inlet and outlet is more than value of reverse lower border frequency of charge amplifier for piezoelectric detector.

EFFECT: expansion of dynamic range of measured vibration speeds and higher validity of functioning.

20 cl, 15 dwg