Constant-gain variable bandwidth amplifier system
阅读：659发布：2023-12-08
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4. A CONSTANT-GAIN VARIABLE BANDWIDTH SYSTEM FOR USE IN MEASURING A RECEIVED ELECTRICAL SIGNAL OF A PREDETERMINED FREQUENCY, COMPRISING A DIFFERENTIAL AMPLIFIER AND MIXING CIRCUIT HAVING TWO INPUT CIRCUIT TERMINALS AND AN OUTPUT CIRCUIT TERMINAL; SAID RECEIVED SIGNAL BEING SUPPLIED TO ONE OF SAID INPUT TERMINALS; A NORMALLY NARROWBAND TUNED AMPLIFIER CIRCUIT TUNED TO SAID PREDETERMINED FREQUENCY, AND HAVING ITS INPUT CONNECTED TO SAID MIXER CIRCUIT OUTPUT TERMINAL, AND ITS OUTPUT CONNECTED AS A NEGATIVE FEEDBACK CIRCUIT THROUGH A VARIABLE CONTROL ELEMENT FOR SUPPLYING A CONTROLLABLE PORTION OF THE FEEDBACK SIGNAL TO THE OTHER OF SAID TWO INPUT CIRCUIT TERMINALS OF SAID MIXING CIRCUIT; AN OUTPUT SIGNAL TERMINAL CONNECTED TO SAID OTHER MIXER INPUT CIRCUIT TERMINAL TO PROVIDE AN OUTPUT SIGNAL HAVING A SUBSTANTIALLY CONSTANT AMPLITUDE RELATIONSHIP TO SAID RECEIVED SIGNAL SUPPLIED TO THE MIXER INPUT TERMINAL, WHEREBY SAID VARIABLE CONTROL ELEMENT CONTROLS THE BANDWIDTH OF THE OUTPUT, SAID CONTROLLABLE PORTION OF THE FEEDBACK SIGNAL BEING AT LEAST FIVE TIMES GREATER THAN THE SIGNAL SUPPLIED TO THE FEEDBACK CIRCUIT, AND MEASURING MEANS CONNECTED TO THE SYSTEM OUTPUT.
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