An NMOS dual-mode digital low-pass filter for color TV

A low-pass filter for separation of the luminance and chroma spectra is dealt with. The function of the filter and the implementation of the filter on a chip are briefly described and the circuit design is discussed in some detail. The chip, which runs at frequencies up to 40 MHz, has been designed with two-phase race-compensated MOS logic in a 4 /spl mu/m E/D NMOS technology with implanted undercrossings.