Samsung WIDT30Q User Manual

User manual of WiDT30Q

Item

Vender

Part number

MAC/BBP/Radio Transceiver/PA

Qualcomm

AR1021X

1. Introduction

WiDT30Q is a USB embedded module compliant with IEEE802.11n standard. The
core chipset is from Qualcomm, part number is AR1021X.

2. Hardware Architecture:

2.1 Main Chipset Information

3.3 Antennas Information

Two SMD antennas supporting both TX & RX.

4. Operational Description

WiDT30Q is the 802.11a/b/g/n RF Module, that acts as a communication hub for users of a
wireless device to connect to a wired LAN.

MIMO type

Product type: WLAN (11b mode: 1TX, 1RX, 11g mode: 1TX, 1RX, Draft n mode: 2TX, 2RX)

Time base of the transmission frequency

For IF and RF frequency, 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.

Transmission

Base-band Processing (BBP) IC has DSSS (BPSK/QPSK/CCK) and OFDM
(BPSK/QPSK/16QAM/64QAM) modulation function, it provides transmission data rate are 1, 2,

5.5, 11 Mbps 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.

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.

Base band Processing

1. Channel selection is controlled by BBP IC to support data modulation:

- DSSS (BPSK/QPSK/CCK)

- OFDM (BPSK/QPSK/16QAM/64QAM)

Power Control Level

It uses closed-loop power control function to limit RF output power level.

Transmit/Receive Switch

EUT has Transmit/Receive Switch and Antenna switch. End user can’t select any power setting.

Channel Selection Restriction

For product available in the USA/Canada/Taiwan market, only channel 1~11 can be operated.
Selection of other channels is not possible. But product also could be available in the
Europe/Japan market, channel 1~13 can be operated under the manufacturer change the different
driver.

Data Rate Control

The operation date rate is changing during data transfer base on the optimization of driver.

Discontinue Transmitting with absence of Data or operational failure states

“The device shall automatically discontinue transmission in case of either absence of information

to transmit or operational failure. These provisions are not intended to preclude the transmission
of control or signaling information or the use of repetitive codes used by certain digital
technologies to complete frame or burst intervals. Applicants shall include in their application for
equipment authorization a description of how this requirement is met.” Data transmission is
always initiated by software, which is then passed down through the MAC, through the digital
and analog baseband, and finally to the RF chip.
Several special packets (ACKs, CTS, PSPoll, etc...) are initiated by the MAC. These are the only
ways the digital baseband portion will turn on the RF transmitter, which it then turns off at the
end of the packet. Therefore, the transmitter will be on only while one of the aforementioned
packets is being transmitted.

Product Details

> Modulation see the below table for draft n
> Data Modulation OFDM (BPSK / QPSK / 16QAM / 64QAM)
> Frequency : 2.4GHz and 5GHz
> Data Rate (Mbps) see the below table for Draft n
> Channel Number 4 for 20MHz bandwidth ; 2 for 40MHz bandwidth
> Channel Band Width (99%) MCS8 (20MHz): 18.08 MHz ; MCS8 (40MHz): 36.48 MHz