Current modulation filter
OwnerHarry Oliverinventor
Life of this patent
Estimating the term…
Abstract
A current modulation filter for mitigating fluctuations in current on a power supply line due to time dependent current demands of a load circuit includes a biasing circuit for providing a source voltage reference and a quiescent current reference and a load voltage sensing circuit for providing a voltage measurement of the operating voltage of the load circuit. A current sensing circuit is electrically interposed between the power source and the load circuit. A voltage drop across the current sensing circuit is transmitted as a voltage difference to a current controller which subsequently supplies or sinks current to the power supply line so as to maintain a constant current level thereon.
Claims18
A current modulation filter electrically interposed between a power source and a load circuit, comprising:
- a biasing circuit having a first voltage reference node and a current reference node, said biasing circuit electrically coupled in parallel connection to the power source;
- a load voltage measurement circuit having a second voltage reference node, said load voltage measurement circuit electrically coupled in parallel connection to the load circuit;
- a current sensing circuit series connected between the power source and the load circuit;
- and
- a current control circuit electrically coupled at a first input terminal thereof to said first voltage reference node, at a second input terminal thereof to said second voltage reference node, at a first output terminal thereof to the load circuit and at a second output terminal thereof to said current reference node, said current control circuit supplying electrical current to, or sinking electrical current from, the load circuit responsive to a voltage difference between said first input terminal thereof and said second input terminal thereof such that current through said current sensing circuit remains constant to within a predetermined value over a predetermined range of load current demand level.
A current modulation filter for compensating for fluctuations in current from a power source due to time-dependent current demands of a load circuit, the current modulation filter being electrically interposed between the power source and the load circuit, the power source having a supply terminal for supplying power thereon and a ground terminal and the load circuit having a delivery terminal for receiving power thereon and a ground terminal, the current modulation filter comprising:
- a reference voltage node electrically coupled to the ground terminal of the power source and to the ground terminal of the load circuit;
- a current sensing circuit electrically coupled at a first terminal thereof to the supply terminal of the power source and at a second terminal thereof to the delivery terminal of the load circuit;
- a first resistor circuit including a first plurality of resistors respectively connected in series at a corresponding first set of interposing nodes, said first resistor circuit electrically coupled at a first terminal thereof to the supply terminal of the power source and a second terminal thereof to said reference voltage node;
- a second resistor circuit including a second plurality of resistors respectively connected in series at a corresponding second set of interposing nodes, said second resistor circuit electrically coupled at a first terminal thereof to the delivery terminal of the load circuit and at a second terminal thereof to said reference voltage node;
- and
- a current control circuit electrically coupled at a first input terminal thereof to a first node of said first set of interposing nodes, at a second input terminal thereof to a first node of said second set of interposing nodes, at a first output terminal thereof to the delivery terminal of the load circuit and at a second output terminal thereof to a second node of said first set of interposing nodes, said current control circuit supplying electrical current to, or sinking electrical current from, the delivery terminal of the load circuit responsive to a voltage difference between said first input terminal and said second input terminal thereof such that current through said current sensing circuit remains constant to within a predetermined value over a predetermined range of load current demand level.
Dependencies are inferred from the claim text.