A method for improved transducer performance from 20 MHz to 100 MHz considering the effects of output impedance of a high frequency pulser

A major assumption frequently made by transducer engineer is that the output impedance of the pulse drive waveform is below 50 /spl Omega/ across the entire frequency spectrum. However, this is not the case and the output impedance has a reactive component that may considerable affect transducer center frequency and bandwidth. The pulse echo response of a 80 MHz LiNO/sub 3/ transducer was measured with and without an auto-transformer attached to the pulser. Improved transducer performance was shown.