Method for designing de-emphasis circuit for video signal processing integrated circuit and integrated circuit made by the same

A video signal processing integrated circuit (IC) incorporating a determining circuit for determining a level of a reproduced video signal of a de-emphasis circuit, said determining circuit including a reproduced video level setting unit, wherein the reproduced video level setting unit comprises:

• an amplification unit for amplifying a demodulated luminance signal output from the de-emphasis circuit;
• a plurality of resistance elements connected to the amplification unit;
• and
• a gain-controlled switching unit connected to the plurality of resistance elements for switching electrical connections of the plurality of resistance elements according to the level of the reproduced video signal, thereby determining a gain of the amplification unit.

A method of designing a video signal processing integrated circuit (IC), comprising the steps of:

• providing said video signal processing IC with a luminance signal processing block having a de-emphasis circuit;
• incorporating a determining circuit for determining a level of a reproduced video signal of the de-emphasis circuit into the video signal processing IC;
• and
• connecting the determining circuit between an output of the de-emphasis circuit and a ground exclusively used for the luminance signal processing block.