Saw filter for a tuner of a digital satellite receiver

Details Saw filter for a tuner of a digital satellite receiver Saw filter for a tuner of a digital satellite receiver

1997-02-11

1999-04-27

Flynn, Nathan

Telecommunications

Wireless distribution system

348731, H04N 544

Patent

active

058989005

ABSTRACT:
A tuner of for a digital satellite television receiver comprises a single conversion stage which produces an IF signal at a low enough frequency to permit a SAW filter to be used to perform symbol shaping as well as the normal IF filtering function. The local oscillator is controlled by a phase locked loop tuning control IC normally used to control the local oscillator of a tuner of a conventional broadcast or cable television receiver. In an exemplary embodiment for tuning RF signals provided by a block converter in the 950 to 1450 mHz frequency range, the IF has a center frequency of 140 mHz. A lithium tantalate SAW filter is used in order to minimize shift of the IF center frequency with temperature and to provide the required relative IF bandwidth (i.e., the width of the IF passband divided by the IF center frequency).

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