DocumentCode
1137640
Title
Digital AM transmitters
Author
Swanson, Hilmer
Author_Institution
Harris Corp., Quincy, IL, USA
Volume
35
Issue
2
fYear
1989
fDate
6/1/1989 12:00:00 AM
Firstpage
131
Lastpage
133
Abstract
Digital amplitude modulation (AM) generates a high-quality AM signal with an overall efficiency of greater than 80%. Digital AM was introduced in March 1987 with a 10-kW solid-state transmitter. Also completed are 25-kW and 50-kW transmitters, and plans exist for transmitters up to 2000 kW. The digital AM system utilizes a high-speed 12-bit analog-to-digital converter (A/D), a digital modulation encoder, and a power-multiplying digital-to-analog converter. The latter reconverts the digital information back to analog to form an AM signal. Use of this system results in an AM transmitter with outstanding efficiency, audio performance, and reliability
Keywords
amplitude modulation; radio transmitters; 12-bit analog-to-digital converter; 20 to 2000 kW; AM transmitters; audio performance; digital modulation encoder; efficiency; power-multiplying digital-to-analog converter; radio; reliability; Amplitude modulation; Digital modulation; Digital-analog conversion; Power amplifiers; Radio frequency; Radiofrequency amplifiers; Solid state circuits; Temperature; Testing; Transmitters;
fLanguage
English
Journal_Title
Broadcasting, IEEE Transactions on
Publisher
ieee
ISSN
0018-9316
Type
jour
DOI
10.1109/11.30824
Filename
30824
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