User's Manual

- 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 up-converted to the 2.4GHz ISM. Linear on chip power amplifier are
included, which are capable of delivering high output powers while IEEE802. /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) modulation function, 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
The MT7603UN 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. 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.
- Adaptive Frequency Hopping
The
WDN220M gathers link quality statistics on a channel by basis to facilitate channel assessment and
Channel map selection. The link quality is determined using both RF and baseband signal processing to
Provide a more accurate frequency-hop map.
- Product Details
> Data Modulation
DSSS: CCK, BPSK, QPSK for 802.11b
OFDM: BPSK, QPSK, 16QAM, 64QAM for 802.11 g/n,
> Frequency Range
2400-2483.5MHz
Version 1.0 Xuguang Tech. page 7 of 9