Programmable surface acoustic wave devices utilizing hybrid microelectronic techniques

Programmable matched filters can be realized using surface acoustic wave propagation in conjunction with external microelectronic circuitry. Here two devices, a programmable analogue matched filter and a diode convolver, are discussed, highlighting the similarities in constructional technique. Specific device requirements include an r.f. circuit which for 10 MHz signal bandwidth must possess a 310 ¿m pitch. Factors influencing the choice of the thin film hybrid microelectronic technique are outlined and the design, fabrication and performance details are described.