BCM89359 Advance Data Sheet
WLAN Radio Subsystem
Section 11:WLAN Radio Subsystem
The BCM89359 includes an integrated dual-band WLAN RF transceiver that has been optimized for use in
2.4 GHz and 5 GHz Wireless LAN systems. It has been designed to provide low-power, low-cost, and robust
communications for applications operating in the globally available 2.4 GHz unlicensed ISM or 5 GHz U-NII
bands. The transmit and receive sections include all on-chip filtering, mixing, and gain control functions.
Twenty RF control signals are available (10 per core) to drive external RF switches and support optional external
power amplifiers and low-noise amplifiers for each band. See the reference board schematics for further details.
The BCM89359 includes an integrated dual-band WLAN RF radio that follows an RSDB architecture, using two
RFPLLs, where each core can operate independently. The same radio can be configured in MIMO mode,
whereas one RFPLL is used to drive both of the cores and MIMO operation is achieved.
Receiver Path
The BCM89359 has a wide dynamic range, direct conversion receiver that employs high order on-chip channel
filtering to ensure reliable operation in the noisy 2.4 GHz ISM band or the entire 5 GHz U-NII band. An on-chip
low noise amplifier (LNA) in the 2.4 GHz path in CORE0 (can be optional) is shared between the Bluetooth and
WLAN receivers, whereas the 5 GHz receive path and the CORE1 2.4 GHz receive path have dedicated on-
chip LNAs. Control signals are available that can support the use of external LNAs for each band, which can
increase the receive sensitivity by several dB.
Transmit Path
Baseband data is modulated and upconverted to the 2.4 GHz ISM or 5 GHz U-NII bands, respectively. Linear
on-chip power amplifiers are included, which are capable of delivering high output power while meeting IEEE
802.11ac and IEEE 802.11a/b/g/n specifications, and without the need for external PAs. When using the internal
PAs, closed-loop output power control is completely integrated.
Calibration
The BCM89359 features dynamic and automatic on-chip calibration to continually compensate for temperature
and process variations across components. These calibration routines are performed periodically in the course
of normal radio operation. Examples of some of the automatic calibration algorithms are baseband filter
calibration for optimum transmit and receive performance, and LOFT calibration for carrier leakage reduction.
In addition, I/Q Calibration, R Calibration, and VCO Calibration are performed on-chip. No per-board calibration
is required in manufacturing test, which helps to minimize the test time and cost in large volume production.
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 70
BROADCOM CONFIDENTIAL
CYPRESS [ CYPRESS ]
