Operation Description

Version 1.0
XuGuang Tech
page 2 of 14
3. Operational Description
WCA732M is the 802.11a/b/g/n /ac +Bluetooth 5.0 Combo Module that acts as a communication controller for
users of a wireless device to connect to SMART TV
- Features
>IEEE 802.11ac Draft compliant.
>Dual-band 2.4GHz /5 GHz
>Dual-stream spatial multiplexing up to 600Mbps data rate
>Support 20, 40, 80MHz channel with optional SGI(256QAM modulation)
>On-chip power amplifiers and low –noise amplifiers for both bands
>Complies with Bluetooth Core Specification Version 5.0
>Supports BT/Wi-Fi coexistence.
>Adaptive frequency hopping (AFH) for reducing radio frequency interference
- Time base of the RF frequency
For IF and RF frequency, 40MHz crystal 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
- Wi-Fi Transmission
Baseband data is modulated and up converted to the 2.4GHz ISM and 5-GHz U-NII bands, respectively.
Linear on chip power amplifier are included, which are capable of delivering high output powers while
Meeting IEEE802.11ac and IEEE802.a/b/g/n specifications without the need for external PAs. When using the
internal PAs, closed-loop output power control is completely integrated. Base-band Processing (BBP) IC has DSSS
(BPSK/QPSK/CCK) and OFDM (BPSK/QPSK/16QAM/64QAM/25QAM) 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.
- Wi-Fi Receiver
The MT7668AUN has a wide dynamic range, direct conversion receiver that employs high-order on-chip
channel filtering to ensure reliable operation in the noisy 2.4GHz ISM band or the entire 5GHz U-NII band
.Control signals are available that can support the use of optional LNAs for each band,which can increase the receive
sensitivity by several decibels. 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.