The MAX9989/MAX9990 are +20 dBm LO buffers. These single ICs provide ۫ dB output power variance while replacing three discrete amplifiers, a coupler, and dozens of biasing components. They are ideal for cellular/GSM/DCS/PCS, and UMTS base station applications. The designer can set the output power levels from +14 dBm to +20 dBm.