Dual-Band 802.11a/g/n/ac Wireless LAN Front End

The SKY85809-11 is a complete 802.11a/b/g/n/ac wireless local area network (WLAN), RF front-end module (FEM) that provides all the functionality of a power amplifier (PA), filtering, power detector, transmit/receive (T/R) switch, diplexer, and associated matching. The SKY85809-11 provides a complete 2.4 GHz and 5 GHz WLAN RF solution, from the output of the transceiver to the antenna in an ultra-compact form factor. Designed to meet the stringent linearity conditions of the 802.11ac standard, the SKY85809-11 delivers less than 2% error vector magnitude (EVM) at the rated alternating current (AC) power.

Designed for ease of use, all RF ports are matched to 50  to simplify the layout of the printed circuit board (PCB) and the interface to the transceiver. The SKY85809-11 also includes a transmitter power detector with +20 dB of dynamic range for each transmit chain. Each power amplifier has a separate digital enable control for transmitter on/off control. The power ramp rise/fall time is less than 0.5 µs.

The SKY85809-11 provides local oscillator (LO) filters for the 2 GHz and 5 GHz transmit paths.

The SKY85809-11 is packaged in a small 4.0 x 3.0 x 0.6 mm, Quad Flat No-Lead (QFN) package.

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Frequency (GHz) Min.2.4
Frequency (GHz) Max.5.15
802.11 WLAN Standarda/b/g/n/ac
Antenna Ports1
ArchitectureDual Band 802.11a/b/g/n/ac WLAN FEM
Typ. POUT @ 2.5% EVM (dBm)
Typ. POUT @ 3.0% EVM (dBm)
Typ. Tx Gain (dB)
VCC (V)3.95-5.5
PackageQFN, 28-pin
Package (mm)4 x 4 x 0.6


  • All RF ports matched to 50 
  • Integrated 2.4 GHz PA, 5 GHz PA, transmit filter, diplexers, and T/R switches
  • Integrated logarithmic power detector for each transmit chain
  • +25 dBm power, 802.11b, 11 Mbps, ACPR = +35 dBc
  • +22 dBm @ 3% (-30 dB) EVM, MCS7, HT40, 2G
  • +19.5 dBm @ 3% (-30 dB) EVM, MCS7, HT40, 5G
  • +20 dBm @ 1.8% (-35 dB) EVM, MCS9, HT40, 2G
  • +18.5 dBm @ 1.8% (-35 dB) EVM, MCS9, HT80, 5G
  • Single supply voltage: 5.0 V ± 10%
  • Sleep mode: < 1 A
  • Bluetooth® functional when VCC = 0 V or 5.0 V
  • Bluetooth and 5 GHz WiFi concurrent operation
  • Multiple receive bypass step attenuation
  • Small QFN (28-pin, 4.0 x 3.0 x 0.6 mm) package (MSL3, 260 °C per JEDEC J-STD-020)

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