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Unformatted text preview: ) ∓ fIF /2 = fc +
3/2fIF or fc + 1/2fIF . The 1/2-IF interference frequency refers to the interference frequency fi = fc + fIF /2
which is separated from the desired carrier frequency by 1/2 of fIF . In this case fi = 1935 + 70/2 = 1970
MHz. 2-16 Solution
a. The ﬁrst IF ﬁlter plays the role of the pre-selector for the second mixer/LO. The secondary image response
will be at fIF 1 ± 2fIF 2 . Suppose that the secondary image is at fIF 1 + 2fIF 2 . Then the ﬁrst IF ﬁlter must
cut-oﬀ no higher than fIF 1 + 2f...
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This homework help was uploaded on 03/13/2014 for the course ECE 453 taught by Professor Staff during the Spring '08 term at University of Illinois, Urbana Champaign.
- Spring '08