INTEGRATED AMPLIFIER FOR DRIVING ACOUSTIC TRANSDUCERS

摘要

The invention relates to an electronic integrated amplifier (100; 200) for driving an acoustic transducer. The amplifier comprises two differential input terminals (10, 11; 20, 21) to receive an input signal (Vin) and a first (12; 22) and a second (GND; 23) output terminal to provide an output signal (Vout) to the transducer. In addition, the amplifier comprises an operational amplifier (OA; OA' ) having an input end (IN) including differential inputs and an output end (OUT) operatively associated with the first (12; 22) and second (GND; 23) output terminals. A pair of input resistors (R1) connect the two differential input terminals to two (14, 15; 24, 25) intermediate terminals, respectively. A pair of feedback resistors (R2) connect the first (12; 22) and second (GND; 23) output terminals to the two intermediate terminals, respectively. The integrated amplifier also comprises means (C1, C2, Csw1, Csw2) for high-pass filtering the input signal (Vin). Such filtering means is characterized in that it comprises an input element (C1, C2) interposed between said intermediate terminals and the input end (IN) of the operational amplifier (OA; OA'), and a feedback element (Csw1, Csw2) connected between the input end (IN) and the output end (OUT) of the same operational amplifier (OA; OA').