ELECTRONIC AMPLIFIER WITH DUAL AUTOMATIC SLOPE CONTROL
First Claim
1. In combination in an amplifier exhibiting an amplification gain-frequency characteristic which is electronically variable at differing frequency ranges thereof, said amplifier adapted to operate on an incident signal ensemble which includes pilot signals spaced in frequency, said pilot signals being located in first and second portions of the amplifier gain-frequency passband characteristic, said amplifier comprising gain producing means, first electrically controlled means for varying the amplifier gain-frequency relationship about said first portion of said amplifier pass-band characteristic, second electrically controlled means for varying the amplifier gain-frequency relationship about said second portion of said amplifier passband characteristic, means connected to the output of said gain producing means for determining the amplitude of the first pilot signal at the output of said amplifier, first direct current amplifier means responsive to the output of said first pilot amplitude determining means for supplying a control signal to the control input port of said first amplifier characteristic varying means, additional means connected to the output of said gain producing means for determining the amplitude of said second pilot signal present at the output of said amplifier, and additional direct current amplifier means connected to said additional pilot amplitude determining means for supplying control signal to the input port of said second amplifier characteristic varying means, wherein said gain producing means and said first and second amplifier characteristic varying means comprise a transistor, a first diode, means for supplying a direct current bias to said first diode, means for coupling said diode to said transistor base terminal on a radio frequency current basis, a second diode, means for supplying direct current bias to said second diode, and means including said secOnd diode for providing negative feedback at radio frequency between said transistor collector and base terminals.
0 Assignments
0 Petitions
Accused Products
Abstract
An amplifier is characterized by electronically variable slopes ('"'"''"'"''"'"''"'"'tilt'"'"''"'"''"'"''"'"') at the bounds of its signal amplification gainfrequency passband characteristic. Separate feedback circuitry is responsive to an associated one of two frequency-spaced pilot signals for suitably adjusting the response properties of the amplifier. The pilot signals may be specially generated, or may comprise components of the signal operated upon by the amplifier - such as one high band and one low band video carrier for a CATV television signal distribution application.
28 Citations
1 Claim
-
1. In combination in an amplifier exhibiting an amplification gain-frequency characteristic which is electronically variable at differing frequency ranges thereof, said amplifier adapted to operate on an incident signal ensemble which includes pilot signals spaced in frequency, said pilot signals being located in first and second portions of the amplifier gain-frequency passband characteristic, said amplifier comprising gain producing means, first electrically controlled means for varying the amplifier gain-frequency relationship about said first portion of said amplifier pass-band characteristic, second electrically controlled means for varying the amplifier gain-frequency relationship about said second portion of said amplifier passband characteristic, means connected to the output of said gain producing means for determining the amplitude of the first pilot signal at the output of said amplifier, first direct current amplifier means responsive to the output of said first pilot amplitude determining means for supplying a control signal to the control input port of said first amplifier characteristic varying means, additional means connected to the output of said gain producing means for determining the amplitude of said second pilot signal present at the output of said amplifier, and additional direct current amplifier means connected to said additional pilot amplitude determining means for supplying control signal to the input port of said second amplifier characteristic varying means, wherein said gain producing means and said first and second amplifier characteristic varying means comprise a transistor, a first diode, means for supplying a direct current bias to said first diode, means for coupling said diode to said transistor base terminal on a radio frequency current basis, a second diode, means for supplying direct current bias to said second diode, and means including said secOnd diode for providing negative feedback at radio frequency between said transistor collector and base terminals.
Specification
-
- Resources
-
Current AssigneeGeorge Otto Duty
-
Original AssigneeGeorge Otto Duty
-
InventorsDuty, George Otto
-
Primary Examiner(s)Lake, Roy
-
Assistant Examiner(s)Mullins, James B.
-
Application NumberUS05/295,564Time in Patent Office445 DaysField of Search330/29,52,86,132,134,137,145 333/18US Class Current330/52CPC Class CodesH03G 5/16 Automatic controlH04B 3/36 Repeater circuits H04B3/58 ...
