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1 System Overview
Functional Block Diagram
MT7976CN is an IEEE WiFi 6 MIMO RF chip which contains 2.4 GHz WI-Fi transceiver front-ends and 5 GHz Wi-
Fi transceiver front-ends in a DRQFN package. Simplified block diagram and how MT7976CN is used are shown
in Figure 1-1. The top control logics control each subsystem independently. Each subsystem also has dedicated
LDOs. A thermal sensor and a low-speed ADC (Analog-to-Digital Converter) are provided to monitor
MT7976CN’s temperature variation. MT7976CN have its dedicated crystal oscillator (XO) circuit. Besides, XO
circuit provides an external clock source to other chips in the platform.
The transceiver front-ends are on MT7976CN while the ADC/DAC (Analog-to-Digital Converter/Digital-to-
Analog Converter) is in the companion modem chip. The interface drivers/receiver buffers are designed to
drive PCB trace loading.
Figure 1-1. MT7976CN block diagram
XO IN
MT7976CN
WiFi_2G
Tx/ Rx IQ
5 G RF
TRx
5 G WiFi RF
2G RFIO
LNA
5 G RF
TRx
5 G WiFi RF
LNA
5 G RF
TRx
5 G WiFi RF
LNA
WIFI
2G WiFi RF
LNA
PA
WiFi_5G
Tx/ Rx IQ
5 G RF
TRx
5 G WiFi RF
5G RFIO
LNA
5 G RF
TRx
5 G WiFi RF
LNA
5 G RF
TRx
5 G WiFi RF
LNA
WIFI
5G WiFi RF
LNA
PA
3- wire
Ctrl
3- wire
Ctrl
3- wire
Ctrl
3- wire
Ctrl
TRSW
TRSW