Power-Aware Multiband-Multistandard CMOS Receiver System-Level Budgeting

A systematic system-level design methodology for multiband–multistandard (MB–MS) wideband/reconfigurable CMOS receivers is presented. The methodology determines the specifications (noise figure (NF) and linearity) for each building block to minimize the overall power consumption. System-level simulations show that the gain variation of the LNA for various bands/standards is an important factor in minimizing the power consumption for any MB–MS receiver. Analytical expressions for the optimum gain variation of the LNA, NF, and input-referred third-order intercept point of each building block are presented. The design methodology is applied to a wideband receiver covering global systems for mobile communications (GSM) 900and 1900-MHz bands, global positioning systems (GPS), and wideband code-division multiple-access (WCDMA) standards. As an example, the estimated power consumption is reduced by 40% when compared with the approach where the gain of the LNA is constant.