Version 1.0
Samsung Electronics
page 2 of 13
3. Operational Description
WCA720M
is the 802.11a/b/g/n/ac WIFI Module that acts as a communication controller for users of a
wireless device to connect to SMART DEVICE
- Features
>
IEEE 802.11 a/b/g/n/ac
> Dual-band 2T2R Mode(2.4GHz/5GHz)
> 2X2 MIMO, 600MHz
> Support 20MHz, 40MHz, 80MHz bandwidth in 2.4GHz band 5GHz band¦
> Security support for WFA WPA/WPA2 personal, WPS2.0, WAPIP
> QoS support of WFA WMM, WMM PST
> Integrated LNA, PA, and T/R switch
> Optional external LNA and PA support.
- Time base of the RF frequency
For IF and RF frequency, a crystal(40MHz) is a clock reference.
- Synthesizer
Synthesizer inside Transceiver. Internal voltage controlled oscillator (VCO) provides the desired LO
signal base on the phase-locked loop (PLL) with a relatively wide tuning range for this application.
Internal fractional nPLL allows support for a wide range of reference clock frequencies
- WIFI Transmission
Baseband data is modulated and upconverted to the 2.4GHz ISM band, respectively.
Base-band Processing (BBP) IC has DSSS and OFDM modulation function, it provides transmission data
rate are 1, 2, 5.5, 11Mbps on DSSS and 6, 12, 18, 24, 36, 48, 54 Mbps on OFDM. Digital data signal will
be converted to analog (TX IQ) signals through DAC in
BBP
IC, TX IQ pass through to low pass filter. TX
I/Q signal
use direct conversion (zero-IF) architecture converter to generate carrier frequency signal.
Transceiver
IC and internal PA magnify output power.
- WIFI Receiver
Reverse direction isolation of LNA inside Transceiver IC suppresses unwanted radiation. Then RF
signal will be directly down to IF signal (RX IQ) and high frequency spurious emissions are suppressed by
LPF. At last RX IQ signal will be demodulated digital data.