System-in-Package for WLAN/PAN Aids Coexistence with Digital Cellular
Michael P. Gaynor, Douglas Mathews · 2003
The common use of This article looks at the cellular phones, problem of interference, laptop computers, and options for its reduc- cameras, PDAs and varition, between short-range ous other consumer and wireless systems and the commercial products re-digital cellular equipment quires the interference-that share both physical free coexistence of differ-and spectrum space. ent wireless interconnectivity systems—wireless local area networks (WLAN), personal area networks (PAN) and Digital Cellular—in compact, integrated environments. To facilitate the growth of these markets, these products must concurrently decrease in physical size and weight while continuing to reduce cost, in order meet the end users demands for low cost, high functionality system solutions. System in Package (SiP) technology is emerging as a strong contender for the module solution that can meet the needs of these market applications. This article examines interference suppression between systems and presents solutions that meet the cost, size, and weight requirements while maximizing system performance. A Bluetooth system is chosen as an example, though the techniques described are also applicable to most 2.4 GHz WLAN and PAN systems. System Considerations Digital Cellular systems operate near 900