Pulse or digital communications – Pulse width modulation
Patent
1997-09-22
1999-07-06
Pham, Chi H.
Pulse or digital communications
Pulse width modulation
375239, 375353, 3647485, 330136, H03K 708, H03K 704, G06F 700, H03G 320
Patent
active
059205962
ABSTRACT:
An apparatus for amplifying a signal that includes a digital processor (12) producing a first digital signal (20) and a second digital signal (22), a pulse width modulator (32) receiving the first digital signal (20) and producing a pulse width modulated signal, an amplitude restoration module (37) responsive to the pulse width modulator (32), the amplitude restoration module (37) producing an amplitude envelope signal, a frequency upconverter (16) receiving the second digital signal (22) and producing a frequency modulated signal, and a power amplifier (18) responsive to the frequency upconverter and the amplitude restoration module (37). The power amplifier receives the frequency modulated signal and the amplitude envelope signal and produces an amplified output signal.
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Laird Kevin M.
Ma Stephen Chih-Hung
Pan Shao-Wei
Sigmon Bernard E.
Wang Shay-Ping T.
LeMoine Dana B.
Motorola Inc.
Pham Chi H.
Tran Khai
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