Hybrid microelectronic programmable surface acoustic wave matched filters

Programmable matched filters can be realised using surface acoustic wave (SAW) propagation in conjunction with external microelectronic circuitry. Here two devices, a programmable analogue matched filter (AMF) and a diode convolver are discussed highlighting the similarities in constructional technique. Detailed are specific device requirements, such as an RF circuit which for 10 MHz signal bandwidth must possess a 310 µm pitch. Factors influencing the choice of the thin film hybrid microelectronic technique are outlined and the design, fabrication and performance details are described.