AC-only RF ID tags for barcode replacement

An RF ID concept using ac-powered circuits without DC conversion is demonstrated for barcode replacement. A 32b codeword ID tag including an RF front-end, voltage limiter, frequency divider, ROM and power modulator has a 0.02mm/sup 2/ area in a 0.13/spl mu/m CMOS process. A packaging technology uses a sidewall contact to facilitate the assembly process.