A new, high efficiency, digital, modulation technique for AM or SSB sound broadcasting applications

Author

Weaver, Bryan A.

Author_Institution

Continental Electron. Corp., Dallas, TX, USA

Volume

38

Issue

1

fYear

1992

fDate

3/1/1992 12:00:00 AM

Firstpage

38

Lastpage

42

Abstract

Saturated pulse-width modulation (SPWM), a form of modulator control signal that uses a flash converter for analog-to-digital conversion, is discussed. SPWM is used to modulate high-power RF amplifiers. The operations of a flash converter, formed from a plurality of comparators, and a ring modulator, an address rotation circuit that performs a controlled sequence defining which comparator commands a particular power switch, are described

Keywords

amplitude modulation; analogue-digital conversion; modulators; power amplifiers; pulse width modulation; radio broadcasting; radiofrequency amplifiers; switched mode power supplies; AM; SSB; address rotation circuit; analog-to-digital conversion; comparators; digital modulation; flash converter; high-power RF amplifiers; modulator control signal; power switch; radio broadcasting; ring modulator; saturated pulse width modulation; sound broadcasting; Amplitude modulation; Bipolar transistors; Digital modulation; Electron tubes; FETs; Insulated gate bipolar transistors; Pulse amplifiers; Pulse width modulation; Thyristors; Voltage;

fLanguage

English

Journal_Title

Broadcasting, IEEE Transactions on

Publisher

ieee

ISSN

0018-9316

Type

jour

DOI

10.1109/11.127425

Filename

127425