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Power amp targets next-gen WiFi apps

20 Dec 2012

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Microsemi Corp. has unveiled a 5GHz LX5509 power amplifier (PA) for IEEE 802.11ac—also known as fifth generation WiFi—wireless access points and media devices. According to the company, the LX5509 is the first commercially available PA that can transmit at similar power levels in both IEEE 802.11n and IEEE 802.11ac networks, allowing optimum system performance by extending the high data rate range.

In addition to its power capabilities, the LX5509 features a standardised pin out. This enables customers to, without layout changes, later upgrade the performance level in their systems with higher power 5GHz PAs that are currently in development at Microsemi.

The company's 802.11ac solution offerings include the LX5586, said to be the world's first monolithic silicon germanium (SiGe) RF front-end (FE) device.�The company added that the solution works in conjunction with Broadcom's BCM4335 combo chip for mobile platforms.

The LX5509 features linear output power of 19dBm for IEEE 802.11ac 256-QAM 80MHz, EVM < 1.8 per cent @3.3V, and linear output power of 20dBm for IEEE 802.11n 64-QAM 20MHz, EVM < 3 per cent @3.3V. In addition, it touts 28dB OFDM power gain, 50Ω input and output match, eliminating the need to optimise output matching on PCB. Microsemi added that the device boasts an integrated harmonic filter and output detector, and temperature-compensated on-chip output power detector with wide dynamic range.

The LX5509 is packaged in a 4 x 4mm quad flat no-lead (QFN) package and is available for sampling.

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