Linear Power Amplifier for 802.11b
The MAX2242 PA integrates a 3-stage power amplifier, power detector, and power management circuitry. The power detector provides more than 15 dB of dynamic range with ±1 dB accuracy at the highest output power level, allowing an accurate automatic level control (ALC) function to be easily implemented. The PA also features an external bias control pin. Through the use of an external DAC, the current can be throttled back at lower output power levels while maintaining sufficient ACPR performance. As a result, highest possible efficiency is maintained at all power levels.
The device operates on a single +2.7 V to +3.6 V supply. An on-chip shutdown feature reduces operating current to 0.5 mA, eliminating the need for an external supply switch. A fully assembled evaluation kit (MAX2242EVKIT) is available to help reduce design time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086; www.maxim-ic.com