InterDigital Inc (IDCC)

[mschere]

My comment..While you are in the Comic book hero quote mode..Do you have any Marvel comic hero phrases for this TDD input in regard to the same patents? Keep in mind that I received LEGAL input on this site..that Air Interface patents are enforcinble in non-licensed spectrum..

802.11b
There are many competitive IEEE 802.11b wireless-local-area-network (WLAN) cards available in the market today. These WLAN cards operating at 2.4GHz unlicensed band are becoming increasing popular in office or home environment, providing variable high data rate transfer up to 11Mbps. Perhaps, one very important parameter that distinguishes a product from its competition is the range performance, or simply put, the receiver sensitivity.

Superheterodyne receiver is predominantly the chosen architecture for WLAN cards available in the market today. Next generation of WLAN cards demands lower bill-of-material (BOM) cost. Direct conversion receivers are favored since expensive IF filters are eliminated and replaced by on-chip integrated lowpass filters for channel selectivity. Depending on the receiver architecture and fabrication processor chosen for the implementation, a low-noise amplifier (LNA) may be required to effectively lower the overall cascaded noise figure (NF) of the system, thus enhancing the range performance of the receiver.

The MAX2644, designed on a low-noise, advanced silicon-germanium (SiGe) technology, is an excellent choice for WLAN application at 2.4GHz. This low-cost, high third-order intercept point (IP3) LNA features a programmable bias, allowing the input IP3 and supply current to be optimized for specific applications. The LNA provides up to +1dBm input IP3 while maintaining a low-noise figure of 2.0dB and a typical gain of 16dB.

Since IEEE802.11b is a time-division duplexing (TDD) system, the LNA must have fast "Turn-ON and OFF" time in order to fulfill system requirement. Typically, 10ms is an acceptable limit. Lab measurement indicates that the Turn-ON time for the MAX2644 is approximately 8.6ms (power ramping up from less than -30dBm to -13dBm ±1dB). The Turn OFF time is 5ms for 30dB drop from nominal output power. Both timings meet the system requirement of 10ms.