Pulse or digital communications – Pulse width modulation
Patent
1997-11-03
2000-10-10
Chin, Stephen
Pulse or digital communications
Pulse width modulation
375297, 455127, 330 10, 330127, H03K 708, H03K 908, H03F 338, H03G 300
Patent
active
061309109
ABSTRACT:
A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an interleaved class S modulator (270), and a power amplifier (260). The interleaved class S modulator (270) amplifies includes multiple channels (272) which each include a portion of a class S modulator. Each class S modulator has a duty cycle and time offset associated therewith. The duty cycles of the channels (272) can be the same with the time offsets different, or the duty cycles can also be different. For an interleaved class S modulator with N channels (272), the slew rate increases by as much as N, and the output ripple decreases by as much as N.sup.2.
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An article entitled "High-Efficiency Single-Sideband HF/VHF Transmitter Based Upon Envelope Elimination And Restoration" by F.H. Raab and D.J. Rupp, Green Mountain Radio Research Company, USA from IEEE CP392, UK pp. 21-25, Jul. 4-7, 1994.
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Anderson Dale
Midya Pallab
Myers Ronald Gene
Bogacz Frank J.
Chin Stephen
Deppe Betsy L.
LeMoine Dana B.
Lorenz Timothy J.
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