A 30-mW 10.7-MHz pseudo-N-path sigma-delta band-pass modulator

This paper presents a sigma-delta modulator designed to convert band-pass signals for digital radio and cellular telephony. The proposed architecture employs only one operational amplifier, thus allowing a reduction of power consumption. A prototype implemented in a 1.2-/spl mu/m double-poly double-metal BiCMOS technology exhibits an SNR equivalent to 8 bits of resolution over a 200-kHz band, and dissipates only 30 mW with a 5-V supply.