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US 2003/0227571 A1Published application
High impedance digital full line video clamp
AssigneeBroadcom Corporation
InventorsAleksandr Movshovish, Meng Li, Sumant Ranganathan
Life of this patent
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Abstract
A circuit for clamping a TV signal includes an input capacitor coupled to the TV signal, an analog-to-digital converter that outputs a digital signal corresponding to TV signal, a comparator that compares the digital signal to a black level signal, and a high impedance driver that charges the input capacitor in response to an output of the comparator.
Claims30
A circuit for clamping a TV signal comprising:
- an input capacitor coupled to the TV signal;
- an analog-to-digital converter that outputs a digital signal corresponding to the TV signal;
- a comparator that compares the digital signal to a black level signal;
- and
- a high impedance driver that charges the input capacitor in response to an output of the comparator.
2 more elements
A method of clamping a TV signal comprising the steps of:
- coupling the TV signal to an input capacitor;
- converting the TV signal from analog to digital form to produce a digital signal corresponding to the TV signal;
- comparing the digital signal to a black level signal;
- and
- charging the input capacitor in response to an output of the comparator using a high impedance driver.
2 more elements
A circuit for clamping a TV signal comprising:
- capacitor means for coupling an analog TV signal;
- means for converting the analog TV signal to a digital TV signal;
- means for comparing the digital TV signal to a black level signal;
- and
- driver means having high output impedance for charging the capacitor means in response to an output of the means for comparing.
2 more elements
Dependencies are inferred from the claim text.