Title :
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
fDate :
3/1/1992 12:00:00 AM
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;
Journal_Title :
Broadcasting, IEEE Transactions on
