Analog-Digital Performance Comparison.pdf

Digitally Assisted Analog Circuits Bernhard E. Boser University of California, Berkeley Department of Electrical Engineering and Computer Sciences /~boser Digitally Assisted Analog Circuits ? 2004 B. Boser 2 Integrated Circuit Trends ? Moore?s Law ? Transistor count doubles every 2 years ? Rapidly improving circuit performance: ? E.g. microprocessors: ? Clock rate doubles in 2.3 years ? Performance doubles every 1.5 years ? Enables new functions, e.g. ? digital video, ? wireless LAN, WAN, 3G, ? ? Analog circuit performance trends? ? Present trends ? Challenges ? Opportunities Digitally Assisted Analog Circuits ? 2004 B. Boser 3 Analog Circuit Applications Digital Signal Processing Cellular telephony Cameras Disk drives Fiberoptics Optical communication Air bag sensors Networking Audio Video Digitally Assisted Analog Circuits ? 2004 B. Boser 4 Analog Circuit Performance (ADC) 1.0E+08 1.0E+09 1.0E+10 1.0E+11 1.0E+12 1.0E+13 1987 1992 1997 2002 F O M 1 [ H z - L S B ] All ADCs: 2x in 6.5 years Lead ADCs: 2x in 4.7 years R e s o l u t i o n X S a m p l i n g R a t e Year 80-MS/sec 12-Bits 5-GS/sec 6-Bits Digitally Assisted Analog Circuits ? 2004 B. Boser 5 ADC Performance Projection 2032 1.0E+08 1.0E+09 1.0E+10 1.0E+11 1.0E+12 1.0E+13 1987 1992 1997 2002 F O M 1 [ H z - L S B ] “Software Radio” 16-Bit 1GHz Digitally Assisted Analog Circuits ? 2004 B. Boser 6 Analog-Digital Performance Comparison 150x 15 years 1 10 100 1000 1987 1995 2003 R e l a t i v e P e r f o r m a n c e ADC (2x / 4.7 year s) μP MIP S ( 2x / 1.5 yea rs) 10000 Digitally Assisted Analog Circuits ? 2004 B. Boser 7 Analog-Digital Power Comparison 1987 1995 2003 ADC Power/Conversion (0.5x / 2.7years) Energy/Logic Transition (0.5x / 1.7years) Lead μP Power/MIPS (0.5x / 3.4years) 1 0.1 14x 2.5x B e t t e r 0.01 0.001 Digitally Assisted Analog Circuits ? 2004 B. Boser 8 Analog-Digital Power Comparison Digital C gate, wiring c