Receive filter using frequency translation for or in cellular te

Details Receive filter using frequency translation for or in cellular te Receive filter using frequency translation for or in cellular te

1994-10-28

1997-03-18

Faile, Andrew

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

455289, 455303, 455307, 4552761, 455137, H04B 110

Patent

active

056132344

ABSTRACT:
A device for filtering wide-band signals at radio frequencies is usable either in a base station cellular telephony system or separately. The wide-band signal occupies a total frequency band comprising frequency bands allocated to that signal and a central frequency band extraneous to that wide-band signal. Within the device, the wide-band signal is mixed with a heterodyne wave to translate the signal from RF to IF. The signal at IF is then filtered by two surface acoustic wave (SAW) band-pass filters which have respective pass bands which correspond at IF to the allocated frequency bands of the wide-band signal, and which the SAW filters have the filtering effect of passing with low attenuation signals in those allocated bands while substantially attenuating signals and/or noise in the central extraneous frequency band between those allocated bands. The wide-band signal after being so filtered either remains at IF when supplied from the device or, in a subsequent stage of the device, is again mixed with the heterodyne wave to be restored back to RF. The heterodyne wave may be adjustable in frequency.

REFERENCES:
patent: 3605012 (1971-09-01), Kubanoff
patent: 4639786 (1987-01-01), Tamer et al.
patent: 4696055 (1987-09-01), Marshall
patent: 5223809 (1993-06-01), Myer
patent: 5274347 (1993-12-01), Bobadilla

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