Hybrid programmable transversal filter

Details Hybrid programmable transversal filter Hybrid programmable transversal filter

1986-05-30

1988-06-21

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Time domain filters

333193, 333196, H03H 964, H03H 1500

Patent

active

047527501

ABSTRACT:
A hybrid programmable transversal filter (HPTF) is described that employs a LiNbO.sub.3 SAW delay line and two monolithic dual-gate GaAs FET arrays to control magnitude and sign of the 16 tap weights. The HPTF is completely programmable and is constrained only by the bandwidth (100 MHz centered at 250 MHz) and the number of taps. Theoretical calculations of tap weight control range and dynamic range are presented, compared with experiment and used to justify the hybrid LiNbO.sub.3 SAW - GaAs FET combination. Dynamic range of 85 dB and a continuously variable tap weight control range of 70 dB are demonstrated.

REFERENCES:
patent: 4207546 (1980-06-01), Grudkowski
patent: 4328473 (1982-05-01), Montress et al.
patent: 4665374 (1987-05-01), Fathimulla

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