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US 3,943,455 AGranted
Analog feedback amplifier employing a four-quadrant integrated circuit multiplier as the active control element
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorThomas H. Bladen
Life of this patent
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Abstract
An analog feedback circuit for producing a null or zero output for two eir in-phase or 180.degree. out-of-phase input signals applied to the circuit. The dc control voltage is applied along with the first input signal to a multiplier whose output is summed with the second input signal in an operational amplifier to provide the amplitude and phase of the control voltage.
Claims3
An analog feedback circuit comprising:
- a four quadrant multiplier for receiving a first ac analog voltage input signal and a dc control voltage input signal and supplying an output signal;
- a first summing resistor for receiving said multiplier output signal and providing an analog output therefrom;
- a second summing resistor for receiving a second analog voltage input signal of either in-phase or 180.degree. out-of-phase relationship with said first analog voltage input signal and for providing an analog output therefrom;
- means for summing said outputs from said first and second summing resistors;
- and
- feedback circuit means coupled between said summing means and said dc control input for continously providing a nulled or zero output from said summing means by controlling said dc control voltage input signal.
3 more elements
Dependencies are inferred from the claim text.