Noise Immune Charge Amplifier
for Piezoelectric Accelerometers

V. A. Kolyasev, S. V. Len’kov, and S. M. Molin

Physicotechnical Institute, Ural Division, Russian Academy of Sciences, ul. Kirova 132, Izhevsk, 426000 Russia

Received January 21, 2000; in final form, May 10, 2000

Abstract—A charge amplifier with active in-phase interference suppression is intended for investigations at
impact loads accompanied by high-level noises. To suppress low-frequency in-phase interfering signals, a com-
pensation circuit with a differential amplifier is used, and, to suppress high-frequency ones, an input longitudi-
nal transformer is used. The sensitivity of the amplifier is 0.25 mV/pC, in-phase interference suppression factor
is 40 dB at an input cable length of ~100 m.

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.