Active filter with surface acoustic wave resonator filter having

Details Active filter with surface acoustic wave resonator filter having Active filter with surface acoustic wave resonator filter having

1997-06-06

1999-08-10

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333195, H03H 952, H03H 964

Patent

active

059364866

ABSTRACT:
An active filter includes a single resonator surface acoustic wave (SAW) filter with at least two ports, an amplifier, and a phase shifter. The SAW filter has at least two resonant modes which are combined to achieve characteristics of a multi-stage filter. The amplifier and the phase shifter are connected so as to compensate for insertion loss caused by the SAW filter.

REFERENCES:
patent: 3950713 (1976-04-01), Lewis
M.E. Field and C.L. Chen; "Surface Acoustic Wave Regenerative Active Resonator"; IEEE Ultrasonics Symposium Proceedings 1977; pp. 909-912; Phoenix, Arizona, USA Oct. 26-28, 1977.
M. A. Sharif et al.; "Coupled Resonator Filters With Differential Input And/Or Differential Output"; IEEE Ultrasonics Symposium 1995, vol. 1, pp. 67-70; Seattle, Washington, USA, Nov. 7-10, 1995.

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