Dell Wireless 1500 Draft N uses BCM2055 Chipset.
Here are some notes from the chipset maker:
BCM2055
Intensi-fi™ 2.4/5 GHz Radio
The BCM2055 is Broadcom's fifth-generation Wi-Fi® radio and the first RF solution in the Intensi-fi family of draft 802.11n solutions. It integrates multiple 2.4 and 5 GHz radios to support simultaneous spatial streams, enabling Intensi-fi products to deliver extreme performance and more reliable coverage. Built on an all-CMOS architecture, the BCM2055 also provides manufacturers with a highly-integrated solution that offers smaller die size, lower power consumption, and lower phase noise and error vector magnitude (EVM) than competing products.
>Broadcom's best-performing 802.11 radio
>Supports draft 802.11n designs with 2x2, 3x3 and 4x4 configurations
>All-CMOS architecture provides superior RF performance, smaller footprint and lower power consumption
>Supports OneDriver™ software to provide manufacturers with a stable image and >Broadcom's industry-leading performance and ease-of-use features
Link: http://broadcom.com/products/Wireless-LAN/802.11-Wireless-LAN-Solutions/BCM2055