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Unformatted text preview: elector and LO design, the optimum conﬁguration
is up-conversion with high-LO (fLO tunes over the range 61-90 MHz). This conﬁguration has the smallest
tuning ratio (R = 1.475) and all image responses are located well above 30 MHz, which is the upper-cutoﬀ
frequency of the carrier-frequency band of interest. Hence, the preselector can consist of a ﬁx-tuned lowpass
ﬁlter with cutoﬀ frequency at 30 MHz. The preselector response should be as small as possible over the
range 121-150 MHz in order to provide maximum possible...
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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