DocumentCode
910191
Title
Linearization of direct FM frequency modulators
Author
Lipoff, Stuart J.
Author_Institution
Arthur D. Little, Inc., Cambridge, MA
Volume
27
Issue
1
fYear
1978
fDate
2/1/1978 12:00:00 AM
Firstpage
7
Lastpage
17
Abstract
Voltage controlled crystal oscillator (VCXO) frequency modulators have found increasing use in recent years in portable frequency modulation (FM) equipment as an alternative to a standard crystal oscillator followed by a phase modulator. The advantages of using a direct FM VCXO over an indirect FM phase modulator are considered. A model for the crystal and frequency control element will be developed and basic circuit design considerations will be presented. Conditions necessary to minimize audio distortion generated by the VCXO modulator will be dealt with in detail.
Keywords
Chirp modulation; Circuit synthesis; Crystals; Frequency control; Frequency modulation; Frequency response; Oscillators; Phase modulation; Resonance; Speech;
fLanguage
English
Journal_Title
Vehicular Technology, IEEE Transactions on
Publisher
ieee
ISSN
0018-9545
Type
jour
DOI
10.1109/T-VT.1978.23715
Filename
1622456
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