DocumentCode
1014802
Title
A Lower Power Up-conversion Frequency Synthesizer for AM/FM/WB/SW Applications
Author
Mills, Tom ; Rasmussen, Rick
Author_Institution
National Semiconductor Corporation
Issue
3
fYear
1985
Firstpage
576
Lastpage
582
Abstract
The conventional superhetrodyne AM receiver utilizing a 260 to 450 KHz Intermediate Frequency has been with us since its invention in the 1920´s. The block diagram shown in fig. 1 has typified automobile radio design: an RF amplifier drives two tuned circuits which are necessary to protect the mixer from cross-modulation from nearby strong signals, and a local oscillator to produce the desired IF. Although widely implemented, this approach is expensive because of the severe requirements placed on the varactor tuning diodes, and the excessive number of adjustments.
Keywords
Automobiles; Frequency synthesizers; Local oscillators; Protection; RF signals; RLC circuits; Radiofrequency amplifiers; Receivers; Signal design; Varactors;
fLanguage
English
Journal_Title
Consumer Electronics, IEEE Transactions on
Publisher
ieee
ISSN
0098-3063
Type
jour
DOI
10.1109/TCE.1985.289973
Filename
4071280
Link To Document