A CMOS CONTINUOUS-TIME NTSC-TO-COLOR-DIFFERENCE DECODER

A continuous-time NTSC-to-color-difference decoder has been fabricated in a 2-mu m CMOS process. The 9-mm(2) decoder includes the chrominanc e IF filter, automatic gain control, timing recovery, 90 degrees phase shift, demodulators, hue and saturation controls, The 90 degrees phas e-shift circuit is based on peak detection and is used for tuning the chrominance IF filter and demodulation of the R-Y signal, The total po wer dissipation is 45 mW on +/-2.5-V supplies, All circuits are fully differential, This allows the timing-recovery outputs to achieve a dif ferential phase of 0.1 degrees over a horizontal-line interval, For a standard NTSC 1-V-p-p color-bar input, the R-Y and B-Y outputs exhibit maximum phase and gain errors of 1.1 degrees and 1.5%, respectively.