Active current cancellation for high performance video clamps
AssigneeLSI Corporation
InventorAra Bicakci
Life of this patent
Estimating the term…
Abstract
An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to generate a video input signal having a voltage. The second circuit may have a finite input resistance configured to generate a current in response to presenting the voltage across the finite input resistance. The third circuit may be configured to cancel the current by (i) generating the current in response to presenting the voltage across a replica resistor having a resistance similar to the finite input resistance and (ii) passing the current away from the apparatus.
Claims20
An apparatus comprising:
- a first circuit configured to generate a video input signal having a voltage;
- a second circuit having a finite input resistance configured to generate a first current in response to applying said voltage across said finite input resistance, and
- a third circuit to (a) receive said voltage and (b) cancel said current by generating a second current having a negative value when compared with said first current, wherein said second current is generated in response to applying said voltage across a replica resistor having a resistance similar to said finite input resistance.
An apparatus comprising:
- a first circuit configured to generate a video input signal having a voltage;
- a second circuit having a finite input resistance configured to generate a first current in response to applying said voltage across said finite input resistance, and
- a third circuit to (i) divide said voltage into a predetermined voltage level with a high impedance divider and (ii) cancel said current by generating a second current having a negative value when compared to said first current, in response to applying said predetermined voltage level across a replica resistor.
A method for actively canceling a current for high performance video clamps:
- (A) generating a video input signal having a voltage;
- (B) providing a finite input resistance to generate a first current in response to presenting said voltage across said finite input resistance;
- (C) generating a second current having a negative value when compared with said first current in response to presenting said voltage across a replica resistor having a resistance similar to said finite input resistance;
- and
- (D) canceling said current in response to performing steps (A)-(C).
Dependencies are inferred from the claim text.