PRELIMINARY
CYW43438
6. WLAN Radio Subsystem
The CYW43438 includes an integrated WLAN RF transceiver that has been optimized for use in 2.4 GHz Wireless LAN systems. It
is designed to provide low power, low cost, and robust communications for applications operating in the globally available 2.4 GHz
unlicensed ISM band. The transmit and receive sections include all on-chip filtering, mixing, and gain control functions. Improvements
to the radio design include shared TX/RX baseband filters and high immunity to supply noise.
Figure 18 shows the radio functional block diagram.
Figure 18. Radio Functional Block Diagram
WL DAC
WL TXLPF
WL DAC
WL PA
WL PGA
WL TX G‐Mixer WL TXLPF
Voltage
Regulators
WLAN BB
WLRF_2G_RF
4~6nH
Recommend
Q=40
WL ADC
WL ADC
10 pF
WL RXLPF
WLRF_2G_eLG
SLNA
WL G‐LNA12
WL RXLPF
WL RX G‐Mixer
WL ATX
WL ARX
WL GTX
WL GRX
Gm
BT LNA GM
CLB
WL LOGEN
WL PLL
BT PLL
Shared XO
BT RX
BT TX
BT LOGEN
LPO/Ext LPO/RCAL
BT ADC
BT ADC
BT RXLPF
BT LNA Load
BT PA
BT RX Mixer
BT TX Mixer
BT RXLPF
BT BB
BT FM
BT DAC
BT DAC
BT TXLPF
Document Number: 002-14796 Rev. *K
Page 29 of 101
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