Impedance Matching between Transducers and Amplifiers

The complex impedance of a piezoelectric transducer (a projector or a hydrophone) is non-linear and frequency-dependent. Its magnitude ranges from hundreds kΩ to several Ω, and its phase varies from -90° to +90°. The transducer is a capacitive, resistive or inductive load at different frequency ranges. An impedance matching & tuning unit is a necessary device to change the complex impedance of the transducer in a specific narrow frequency range (generally around resonance frequency fs of the transducer) to meet the load requirements of a power amplifier for maximum and efficient power transfer from the electric to the mechanical, or to match the input impedance of a preamplifier for maximum and efficient power transfer from the mechanical to the electric, or achieve optimum source resistance for minimum noise figure NF. Generally, -3dB bandwidth of a transducer with impedance matching and tuning is greater than that of original transducer. Besides, broadband voltage step-up transformers are suitable for Study of dielectric, ferroelectric and piezoelectric materials.

 

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Impedance Matching between Transducers and Amplifiers

Impedance Matching Unit

Refer to Datasheet. Bespoke small size and service temperature up to 200°C is available on request.

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