Amplifiers – With control of power supply or bias voltage – With control of input electrode or gain control electrode bias
Reexamination Certificate
2000-06-14
2001-10-30
Pascal, Robert (Department: 2817)
Amplifiers
With control of power supply or bias voltage
With control of input electrode or gain control electrode bias
C330S149000
Reexamination Certificate
active
06310516
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an amplifier intended for a signal distribution network, for amplifying these signals in a predetermined frequency range, which amplifier comprises means for giving a positive slope to the curve that represents the amplifier gain as a function of frequency.
The invention further relates to a signals distribution network.
An amplifier intended for a signals distribution network according to the above opening paragraph is known from patent application EP-A-0 206 557. According to this document an equalizer corrects the slope in the signal, which slope is due to the attenuation characteristic of the cable as a function of frequency.
SUMMARY OF THE INVENTION
It is an object of the invention to attenuate the intermodulation signals (called “CSO” or “CTB”) created by the amplifier, or, which boils down to the same, to enhance the output power which the amplifier can deliver for a given distortion.
For this purpose, said means give the curve a slope which, compared with the slope called linear slope obtained in the case where the slope regularly increases with frequency, is smaller than the linear slope in the lower region of the frequency range, and larger in the upper region of this range.
As indicated in said document, it is known that cables bring in an attenuation that increases with frequency and it was only natural to look for a compensation of this attenuation, which led to the choice of a larger slope than the linear slope in the lower region of the frequency range, and after this a smaller slope in the upper region of this range; this form of curve exactly compensates the attenuation of the cable. The invention is based on the finding that in fact, for obtaining the best results, a different slope is to be chosen from that which compensates the attenuation of the cable. Advantageously, the curve presenting the gain of the amplifier plotted against frequency, produced by said means, satisfies the formula: L(dB&mgr;V)=K*(F)
3/2
in which “L” is the signal level, “F” is the frequency and “K” is a proportionality factor.
A signals distribution network advantageously comprises at least an amplifier that includes means as defined above.
REFERENCES:
patent: 4366446 (1982-12-01), Henderson et al.
patent: 4600847 (1986-07-01), Baum
patent: 5623228 (1997-04-01), Arbel
patent: 5798854 (1998-08-01), Blauvelt et al.
patent: 0206557A2 (1986-12-01), None
“Empfangsuntersystems im Ku-Band und Ka-Band fur Erdfunkstellen des DFS Kopernikus”, by Michael Alberty et al., Oct. 1990, No. 7 pp. 110-118 (XP000234676).
Choe Henry
Pascal Robert
U.S. Philips Corporation
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