| 摘要 |
An input transducer launches acoustic surface waves along a piezoelectric propagating medium to an output transducer. An iterative series of solid-state amplifiers is disposed alongside the propagating medium. Associated with each amplifier is a signal delay device. A corresponding iterative series of electrodes, also spaced successively along the propagating medium, individually couple successive portions of that medium to respective ones of the amplifiers. Each electrode responds to wave energy in the medium for feeding an input signal to its associated amplifier and an adjacent electrode responds to the delayed output of that amplifier for producing a field in the medium that re-enforces the wave energy. The principle of operation extends at higher frequencies to the use of an electrical delay line with the electrodes, or simply conductors, individually tapped to respective different portions of that line. In any case, all of the different elements are deposited in solid-state form over the surface of a substrate, resulting in a completely integrated amplification system.
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