A 900 MHz integrated Discrete-Time Filtering RF RF Front-End

caroline11

Power, size, and cost are primary design considerations in radio receivers used for portable communications. Unfortunately, superheterodyne IC receivers require discrete tuned-circuits that consume valuable board space and dissipate significant amounts
of power. Direct conversion receivers are an alternative to the superheterodyne receiver architecture [l]. However, in such receivers severe LO to RF leakage limits the achievable dynamic range [2]. Front-end A/D conversion is rarely a viable option because of its limited resolution and excessive power dissipation at high conversion rates