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2D video rate SC FIR filters based on analog RAMs

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4 Author(s)
Gerosa, A. ; Dipt. di Elettronica e Inf., Padova Univ., Italy ; Cortelazzo, G.M. ; Baschirotto, A. ; Malavasi, E.

Monolithic CMOS analog implementations of video systems are extremely attractive because of their low area and power requirements. Switched-capacitor circuits may advantageously replace many current digital solutions of video systems. However, special care must be used in order to handle, with standard CMOS technology, the problems related to the broadband characteristics of video systems. Moreover, two-dimensional (2D) filters require long delay lines, which are not easily implementable in the analog domain. Therefore, new design solutions must be developed, such as the architecture based on analog random-access memories for 2D video-rate switched-capacitor finite-impulse response (FIR) filters, proposed in this work. This structure can be optimized with respect to area requirements and precision requirements, because it allows the exploiting of impulse-response symmetries of linear-phase FIR fitters. The characteristics and the feasibility of the proposed design solution are demonstrated in the design of a 2D low-pass filter for picture-in-picture resizing

Published in:

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:46 ,  Issue: 11 )

Date of Publication:

Nov 1999

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