SWITCHED-CAPACITORS VERSUS SWITCHED-CURRENTS: A THEORETICAL COMPARISON
John B. Hughes, C. Toumazou · 2000
A comparative study betw een switc hed-capacitors (SC) and switc hed-currerts (SI), using speed, pow er and signal-to-noise-ratio as performance vectors, is presen tea. T o no one’s surprise, the analysis suggests that SC outperforms SI considerably for the past and present technologies. Ho wever, as processing heads tav ards lo w er PO w er supplylb. ages the performance of SC falls steadily while that of SI remains almost constant. Ultimately, there is a fundamental tendency for the performance gap between SC and SI to steadily reduce and SI performance is expected to match and surpass that of SC during the course of the next decade.