A monolithic analog video comb filter in 1.2- mu m CMOS

A fully integrated comb filter for luminance/chrominance (Y/C) separation of NTSC video signals is fabricated using a standard 1.2- mu m double-poly CMOS technology. This paper demonstrates its use of analog RAM structures in the realization of video line delays. Information is stored and retrieved using switched-capacitor techniques optimized for operation in a parasitic dominated environment. Fixed pattern noise is avoided through the use of serial data paths whenever possible, necessitating the use of a G/sub m/-enhanced amplifier and techniques to improve the feedback factor. The 11.7 mm/sup 2/ adjustment-free circuit, which requires a single clock and reference current, dissipates 170 mW at 5 V and yields an SNR of 51 dB and frequency response flat within 1.1 dB to 4.2 MHz.>