RF9938RF9938 6 Typical Applications CDMA/TDMA/DCS1900 PCS Systems PHS 1500/ WLAN 2400 Systems General Purpose Upconverter BPSK Modulation Micro-Cell PCS Base Stations Portable Battery-Powered Equipment PCS UPCONVERTER/BPSK MODULATOR Product Description The RF9938 is a complete upconverter designed for PCS applications. The IC contains a double-balanced mixer stage and an output buffer amplifier stage. This device may also be used to directly BPSK modulate a carrier. The mixer is a Gilbert cell with emitter degeneration resistors to provide high IP3. The output stage is a class-B, push-pull configuration to reduce the overall current and still provide a good 50 output match. The unit operates at 3.6V and is designed as part of the RFMD PCS CDMA Chip Set, consisting of a Transmit IF AGC Am……