PRELIMINARY
CYW43340
11. WLAN Radio Subsystem
The CYW43340 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.
11.1 Receiver Path
The CYW43340 has a wide dynamic range, direct conversion receiver. It 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. Control signals are available that can support the use of
optional external low noise amplifiers (LNA), which can increase the receive sensitivity by several dB.
11.2 Transmit Path
Baseband data is modulated and upconverted to the 2.4 GHz ISM or 5-GHz U-NII bands, respectively. The CYW43340 includes an
on-chip regulator which regulates VBAT down to 3.3V for the CYW43340 on-chip linear Power Amplifiers. Closed-loop output power
control is provided by means of internal a-band and g-band power detectors.
11.3 Calibration
The CYW43340 features dynamic and automatic on-chip calibration to continually compensate for temperature and process variations
across components. This enables the CYW43340 to be used in high-volume applications, because calibration routines are not
required during manufacturing testing. 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 test time and cost during large volume
production.
Document Number: 002-14943 Rev. *L
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