Telecommunications – Transmitter – Measuring – testing – or monitoring of transmitter
Patent
1996-01-31
2000-11-14
Faile, Andrew I.
Telecommunications
Transmitter
Measuring, testing, or monitoring of transmitter
455304, 330 52, 330151, H04B 1700
Patent
active
061481858
ABSTRACT:
The present invention relates to a feed-forward amplifying device suitable for radio communication systems such as digital automobile telephone. In the feed-forward amplifying device which includes a distortion extracting loop circuit unit including a main amplifier which amplifies a main signal in a main signal system, the distortion extracting loop circuit unit creating a distortion extracting signal by controlling the phase of the main signal the distortion extracting signal obtained by canceling the main signal component of an output from the main amplifier; and a distortion removing loop circuit unit arranged at the rear stage of the main amplifier, the distortion removing loop circuit unit producing only the main signal component from a signal in the main signal system at the rear stage of the main amplifier using the distortion extracting signal obtained by canceling the main signal component, the distortion extracting loop circuit unit executes phase control by shifting a phase control point where the main signal can be most canceled, thus creating the distortion extracting signal. This device can improve the power efficiency with a small back-up of the amplifier and stably produce a low-distortion amplified signal.
REFERENCES:
patent: 5166634 (1992-11-01), Narahahi et al.
patent: 5230082 (1993-07-01), Ghisler et al.
patent: 5355519 (1994-10-01), Hasegawa
patent: 5493252 (1996-02-01), Takai
patent: 5515000 (1996-05-01), Maruyama et al.
patent: 5532642 (1996-07-01), Takai
patent: 5565814 (1996-10-01), Fukuchi
patent: 5610554 (1997-03-01), Anvari
Furukawa Tatsuo
Kobayashi Fumihiko
Maruyama Satoshi
Miyo Tokihiro
Seino Yasushi
Boccio Vincent F.
Faile Andrew I.
Fujitsu Limited
LandOfFree
Feed-forward amplifying device and method of controlling the sam does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Feed-forward amplifying device and method of controlling the sam, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Feed-forward amplifying device and method of controlling the sam will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2074250