Bucket-Brigade Transversal Filters

The bucket-brigade delay line (BBDL) is a sampled data circuit in which signal samples are stored and manipulated as packets of charge under the control of a digitally generated clock. The clock-controllable time delay function that is realized by the BBDL may be used to implement a number of signal processing functions. The tapped delay line or transversal filter structure is of particular interest, however, since it has wide application in the field of signal processing. The implementation of transversal filters via BBDL's is examined. The impact of nonideal delay line parameters on filter performance is considered and the results of computer simulations are presented. The practicability of monolithic transversal filters is demonstrated and the performance of experimental filters is described.