PRELIMINARY
CYW43438
6.1 Receive Path
The CYW43438 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.
6.2 Transmit Path
Baseband data is modulated and upconverted to the 2.4 GHz ISM band. A linear on-chip power amplifier is included, which is capable
of delivering high output powers while meeting IEEE 802.11b/g/n specifications without the need for an external PA. This PAis supplied
by an internal LDO that is directly supplied by VBAT, thereby eliminating the need for a separate PALDO. Closed-loop output power
control is integrated.
6.3 Calibration
The CYW43438 features dynamic on-chip calibration, eliminating process variation across components. This enables the CYW43438
to be used in high-volume applications because calibration routines are not required during manufacturing testing. These calibration
routines are performed periodically during normal radio operation. Automatic calibration examples include baseband filter calibration
for optimum transmit and receive performance and LOFT calibration for leakage reduction. In addition, I/Q calibration, R calibration,
and VCO calibration are performed on-chip.
Document Number: 002-14796 Rev. *K
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