SYMMETRICAL 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. Symmetrical charge amplifier for piezoelectric detector comprises the first, second and third operational amplifiers and limiting unit, the first and second inlets of which are inlets of symmetrical charge amplifier for piezoelectric detector, four resistors, six feedback resistors, six feedback capacitors, two auxiliary resistors and two auxiliary capacitors, four additional resistors. Moreover, product of capacitance value of the first feedback capacitor by value the first feedback resistor resistance, value of the second feedback capacitor capacitance by value of the second feedback resistor resistance, value of the third feedback capacitor capacitance by value of fifth feedback resistor resistance, value of the fifth feedback capacitor capacitance by value of sixth feedback resistor resistance, value of the first additional capacitor capacitance by value of the first additional resistor resistance is more than value of reverse lower border frequency of symmetrical charge amplifier for piezoelectric detector.

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

25 cl, 12 dwg