Method and apparatus for intermediate frequency selection in a h

Details Method and apparatus for intermediate frequency selection in a h Method and apparatus for intermediate frequency selection in a h

1992-05-07

1993-07-20

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551861, 455296, H04B 110

Patent

active

052300943

ABSTRACT:
In a heterodyne receiver having more than one selectable receive frequency and having at least one intermediate frequency circuit (102) capable of operation on at least two intermediate frequencies, a method for selecting one of the at least two intermediate frequencies is shown. The selection method includes selecting (402) one of the more than one selectable receive frequency, and then selecting (408, 410, 504, 506, 510, 512) at least one of the at least two intermediate frequencies for each of the at least one intermediate frequency circuit in response to the selected receive frequency. The selection of the intermediate frequency for each of the at least one intermediate frequency circuit is made such that the selected intermediate frequency does not cause the generation of one or more undesirable spurious frequencies as a result of mixing the selected receive frequency and the selected intermediate frequency.

REFERENCES:
patent: 4545072 (1985-10-01), Skutta et al.
patent: 4551856 (1985-11-01), Victor et al.
patent: 4661995 (1987-04-01), Kashiwagi
patent: 4879758 (1989-11-01), DeLuca et al.
patent: 5058204 (1991-10-01), Tahernia et al.
"Integrated Selectivity for Narrow-Band FM IF Systems", by F. Krummenacher & G. Van Ruymbeke, IEEE Journal of Solid-State Circuits, vol. 25, No. 3, Jun. 1990, pp. 757-760.

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