Saw device tapped delay line and equalizer

Details Saw device tapped delay line and equalizer Saw device tapped delay line and equalizer

1989-07-20

1991-09-24

LaRoche, Eugene R.

Wave transmission lines and networks

Coupling networks

Equalizers

333152, 333154, 333166, H04B 314, H03H 942

Patent

active

050517090

ABSTRACT:
A SAW device tapped delay line includes an apodized input IDT (inter-digital transducer) and a plurality of substantially identical unapodized output IDTs arranged to receive, after delays which successively increase by an amont T, a SAW propagated from the input IDT. Each output IDT is terminated with a low impedance which is constituted by the low input impedance of a buffer amplifier, to minimize acoustic regeneration by the output IDTs. Grounded dummy fingers with the same metallization ratio as the output IDTs are provided between adjacent output IDTs to provide a constant SAW velocity. The delay line is particularly suited to use in an equalizer of a microwave radio transmission system, in which the delay T is the inverse of the symbol rate of the system. Intermediate frequency automatic time domain equalizer (IF ATDE) arrangements using the SAW device tapped delay line are described.

REFERENCES:
patent: 3648081 (1972-03-01), Lean et al.
patent: 3727153 (1973-04-01), McAullife
patent: 4434481 (1984-02-01), Toda et al.
patent: 4814658 (1989-03-01), Suthers
Manes et al., "A Microprocessor Controlled Transversal Filter Based on a SAW Delay Line"; Alta Frequenza (Italy); vol. 51, No. 3; May/Jun. 1982; pp. 134-142.
Article by Carl M. Panasik et al., "A 32 Tap Digitally Controlled Programmable Transversal Filter", IEEE, 1988 Ultrasonics Symposium.

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