Switched-Current Filters
John B. Hughes · Institution of Engineering and Technology eBooks · 1993
In this chapter, the technique is fashioned to the needs of filtering although, like switched-capacitors, it may be applied to many other signal-processing functions. The chapter starts with a brief review of the switched-capacitor technique and then introduces the concepts of sampled-current signal-processing and current memory. Circuit modules are developed which are suitable for implementing filters and this is illustrated by the design of a 6th order low-pass filter. The causes of analogue error are outlined and circuit enhancements are given for improving performance and for rendering the modules amenable to design automation techniques.