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 50Ω 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 Amp, this Transmit Upconverter, a Receive LNA/Mixer, and a Receive IF AGC Amp.

Features

• Supports Dual Mode Operation

• +8dBm Output Intercept Point

• Single 3.6V Power Supply

• Internally Matched Inputs and Outputs

• Buffered Output

• Double-Balanced Mixer

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