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Double-Split-Electrode Transversal Filter for Telecommunication Applications

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3 Author(s)
Ibrahim, A. ; Bell-Northern Res., Ottawa, Canada ; Hupe, G. ; Foxall, T.

A novel structure for on-chip tap weight implementation in CCD transversal filters is described. The new approach employs two splits in the CCD sensing electrodes to improve on the performance of the conventional single-split weighting technique. It is shown that the new approach greatly reduces the capacitance associated with the sensing nodes and consequently reduces the common-mode signal, gain sensitivity, coefficient error, and clock-noise pickup. Experimental results are presented which verify the improved performance of the double-split-electrode structure. The results achieved for a 3.4-kHz low-pass filter clocked at 32 kHz show a signal- signal-to-noise ratio of 86 dB with harmonic distortion of less than 0.3 percent.

Published in:

Communications, IEEE Transactions on  (Volume:27 ,  Issue: 2 )

Date of Publication:

Feb 1979

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