Patent ID: 7079194

Claim:
A RF modulator formed in a single board, comprising: a C/L delay compensation unit receiving a video signal having a luminance signal and a chrominance signal, delaying the luminance signal by 170 nsec with respect to the chrominance signal in the video signal by performing a C/L delay function, and outputting the video signal having the delayed luminance signal; and a modulating unit modulating the video signal outputted from the C/L delay compensation unit to a high frequency signal of a broadcasting channel signal, wherein the video signal inputted to the C/L delay compensation unit comprises: a composite image signal having the combined luminance and chrominance signals, wherein the C/L delay compensation unit comprises: an input amplifier receiving the composite image signal as the video signal and amplifying the received composite image signal by a predetermined level; a C/L delay filter receiving the amplified composite image signal from the input amplifier, delaying the luminance signal by the 170 nsec with respect to the chrominance signal of the amplified composite image signal, and outputting the composite image signal having the delayed luminance signal and the chrominance signal; and an output amplifier amplifying the output composite image signal by a second predetermined level and outputting the amplified output composite image signal, wherein the C/L delay compensation unit comprises an input signal terminal, and the C/L delay filter comprises: a group equalization circuit including a first operational amplifier having a negative input terminal coupled to the input signal terminal through a first resistor and coupled to ground through a second resistor, a positive input terminal coupled to the input signal terminal through a first capacitor, and a first output terminal coupled to the negative input terminal through a third resistor coupled between ground and a junction between the first capacitor and the positive input terminal.