Telecommunications – Transmitter – With feedback of modulated output signal
Reexamination Certificate
2011-06-28
2011-06-28
Nguyen, Lee (Department: 2618)
Telecommunications
Transmitter
With feedback of modulated output signal
C455S127100, C330S280000, C330S296000
Reexamination Certificate
active
07970362
ABSTRACT:
A transmitter has a power amplifier (40) to amplify an input signal having amplitude modulation, a supply voltage controller (10) to control a supply voltage of the power amplifier (40) according to the envelope, a sensor (R1) for sensing a modulation of a current drawn by the power amplifier (40), a delay detector (20) for detecting a delay of the controlled supply voltage relative to the sensed current, and a delay adjuster (30) for compensating the relative delay according to the detected delay. By sensing a current drawn, the delay detected can include any delay contributed by the power amplifier (40) up to that point, and yet avoid the more complex circuitry needed to derive the delay from an output of the power amplifier. Thus the distortion and out of band emissions caused by differential delays can be reduced more effectively.
REFERENCES:
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 6025754 (2000-02-01), Czora
patent: 6049703 (2000-04-01), Staudinger et al.
patent: 2004/0219891 (2004-11-01), Hadjichristos
patent: 2005/0079835 (2005-04-01), Takabayashi et al.
patent: 2004356835 (2004-12-01), None
patent: 2006017202 (2006-02-01), None
Minnis Brian
Moore Paul A.
Nguyen Lee
NXP B.V.
LandOfFree
RF transmitter with compensation of differential path delay does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RF transmitter with compensation of differential path delay, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF transmitter with compensation of differential path delay will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2690008