PIEZO ELECTRIC TRANSDUCER Russian patent published in 2010 - IPC H01L41/08 G01P15/09 

FIELD: electrical engineering.

SUBSTANCE: proposed transducer comprises piezo transducer and preamplifier. First part of preamplifier is arranged in transducer package and comprises amplification stage built around field transistor and three resistors. Second part of preamplifier is arranged outside said package and comprises decoupling capacitor and stabilitron. Cathode of the latter and first output of decoupling capacitor are connected to field transistor source. Second output of decoupling capacitor and stabilitron anode are connected with recorder and power supply, respectively, common point of both being connected with field transistor drain. Transducer comprises also first and second diode connected in series. Cathode of 1^st diode and anode of 2^nd diode are connected with source and drain of field transistor, respectively. Their midpoint is connected with field transistor gate, first electrode of piezo transducer via 1^st resistor first output. First resistor 2^nd output is connected with first outputs of 2^nd and 3^rd resistors. Second output of 2^nd resistor is connected with field transistor source. Second output of 3^rd resistor is connected with piezo transducer 2^nd electrode and field transistor drain.

EFFECT: simplified circuitry, reduce intrinsic noise and protection against field transistor breakdown.

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