Switched-Capacitor circuits as discrete-time analog devices are especially suited for the signal processing tasks occurring when interfacing analog and digital systems. The major obstacle towards the use of standard CMOS technology for SC video filters is the limited speed of high-gain CMOS op-amps. This limitation however can be overcome with some design ingenuity, as in the application considered in this work. Recommendation CCIR-601 [1] prescribes to prefilter luminance and color-difference signals with filters characterized by tight group-delay specifications. In this work we consider the realization of the color difference prefilter Ha(s), which is currently available only in discrete-component (and therefore very expensive) implementations, with an equivalent system formed by the cascade of two integrated filters, namely a continuous-time filter H1(s) and a SC filter H(z). This type of implementation can be applied to the luminance prefilter as well. Since CCIR Recommendation 601 prefilters are at the front-end of every digital television system, there are opportunities for their large-scale production within which the economical advantages of the proposed integrated solution are apparent. © 1994 IEEE
Cortelazzo, G., Malavasi, E., Segato, M., Baschirotto, A., Biaggioni, G. (1994). SC realization of antialiasing CCIR-601 video filters. IEEE TRANSACTIONS ON CONSUMER ELECTRONICS, 40(3), 274-281 [10.1109/30.320806].
SC realization of antialiasing CCIR-601 video filters
BASCHIROTTO, ANDREA;
1994
Abstract
Switched-Capacitor circuits as discrete-time analog devices are especially suited for the signal processing tasks occurring when interfacing analog and digital systems. The major obstacle towards the use of standard CMOS technology for SC video filters is the limited speed of high-gain CMOS op-amps. This limitation however can be overcome with some design ingenuity, as in the application considered in this work. Recommendation CCIR-601 [1] prescribes to prefilter luminance and color-difference signals with filters characterized by tight group-delay specifications. In this work we consider the realization of the color difference prefilter Ha(s), which is currently available only in discrete-component (and therefore very expensive) implementations, with an equivalent system formed by the cascade of two integrated filters, namely a continuous-time filter H1(s) and a SC filter H(z). This type of implementation can be applied to the luminance prefilter as well. Since CCIR Recommendation 601 prefilters are at the front-end of every digital television system, there are opportunities for their large-scale production within which the economical advantages of the proposed integrated solution are apparent. © 1994 IEEE
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