Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1973-10-19
1976-03-02
Tubbesing, T. H.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
330 28, 330 86, 330145, 330, G01S 922, H03F 134
Patent
active
039421813
ABSTRACT:
A variable-gain amplifier comprises a transistor with an emitter connected in a degenerative emitter-follower circuit which includes a PIN diode traversed by a current injector in the form of an operational amplifier, the PIN diode forming part of a negative-feedback path extending from the output to the inverting input of the operational amplifier. To achieve a gain characteristic whose logarithm varies linearly with a control voltage, this control voltage is fed to the same inverting input through an amplifier circuit with an exponential characteristic, including another operational amplifier provided with an input transistor. A temperature-compensating circuit, preceding that input transistor, comprises still another operational amplifier having a further transistor inserted in its negative-feedback path. The variable-gain amplifier may be included in one of two conjugate (sum and difference) channels of a monopulse radar.
REFERENCES:
patent: 3550028 (1970-12-01), Dilley, Jr. et al.
patent: 3582807 (1971-06-01), Addis
patent: 3624561 (1971-11-01), Tongue
patent: 3708699 (1973-01-01), Frei et al.
patent: 3708754 (1973-01-01), Diehl
patent: 3710270 (1973-01-01), Addis et al.
patent: 3723894 (1973-03-01), Benenati
patent: 3743770 (1973-07-01), Vidovic
patent: 3774118 (1973-11-01), Doorn
Berrod Francois
Puverel Fernand
"Thomson-CSF"
Dubno Herbert
Montone G. E.
Ross Karl F.
Tubbesing T. H.
LandOfFree
Variable-gain amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Variable-gain amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Variable-gain amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1281909