RF2948B is a direct sequence spread spectrum transceiver which works in 2.4 GHz ISM band. It is designed for IEEE 802.1lb WLAN, high-speed digital links , wireless home gateway, secure communications links , wireless security systems and the application of digital cordless phones.
The main technical features are as follows :* 45 ~ 500 MHz IF quadrature demodulator ; * chip has a programmable baseband filter; * provide QPSK modulator and upconverter ; * power supply voltage. In the transmitting side, a QPSK modulator and upconverter are inbuilt. In both transmitting and receiving side a single IF SAW filter is used, thereby reducing the number of SAW filters used.
To know more about this device and circuit, you can download its datasheet .