Programmable Surface Wave Matched Filter.

A monolithic programmable surface wave matched filter was designed, fabricated and evaluated having a ROM controlled 31-bit Si-MOSFET biphase tap structure and a zinc oxide film layer transducer structure. Individual matched filter devices were capable of generating and correlating 31-bit PN sequences at a carrier frequency of 100 MHz with a 10 megabitsecond rate. Two of the devices were incorporated in an encoder system with controlling logic circuitray which permitted contiguous signal generation by random selection of codes from the 6 x 31-bit read only memory of the device. A single device was used to correlate coded signals produced by a similar matched filter and a digitally generated signal. The device provides a high degree of signal processing integration on a single silicon chip measuring 770 by 75 mils.