Notes on Sanyo SAW Filters

There are two types of filters, depending on the piezoelectric substrate material.

TSF2xxx

loss is high. However, by using a coil, etc., to obtain proper matching on the SAW filter output side (which does increase

the number of external components), it is possible to suppress the insertion loss while at the same time making the level

of the characteristics variable, which provides additional design freedom. (Refer to Fig. 13.) In addition, because the SAW

(surface wave) reflection is small, ripple within the band can be kept low.

to the diagram below.) In addition, because the insertion loss is low (although the ripple within the band is somewhat

peripheral circuit components and the pattern layout, and make it possible to stabilize the trap characteristics outside of

the band.

(a) Picture wide BAND SAW Filter

Japan

TSF1137U

U.S.

TSF1241U(with IS-31 Trap)

(b) INTER Carrier SAW Filter

Japan

TSF1138P

U.S.

TSF1220P

LA7583

No.5177-14/15