Practical Design and Applications of Current-mode Systems

In the previous chapters, the design of current-mode filters using transconductances, CCs, SI memory cells, and log-domain cells were studied in detail. While SI and log-domain designs yielded transistor-level implementations, the OTA and CC (which were treated as block boxes) need to be implemented using bipolar or MOS or BiCMOS technologies. Extensive work has been done on the design of transconductance elements in all these technologies, which will be covered in the first part of this chapter. The second part deals with the design of CCs in bipolar and MOS form. Some of the emerging areas of applications of current-mode filters and voltage-mode filters using OTAs are PLL loop filters, video filters, magnetic disk drive read channel ICs, DVD read channel ICs, ADSL analog front ends and RF circuits, e.g., for paging receivers. Anti-aliasing filters for digital audio are good candidates now for mixed-signal design. These will be considered in detail in this chapter.

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