Datasheet

3 Functional Description
3.6.1 2.4 GHz Receiver
The 2.4 GHz receiver demodulates the 2.4 GHz RF signal to quadrature baseband signals and converts them to
the digital domain with two high-resolution, high-speed ADCs. To adapt to varying signal channel conditions,
ESP32-S3 integrates RF filters, Automatic Gain Control (AGC), DC offset cancelation circuits, and baseband
filters.
3.6.2 2.4 GHz Transmitter
The 2.4 GHz transmitter modulates the quadrature baseband signals to the 2.4 GHz RF signal, and drives the
antenna with a high-powered CMOS power amplifier. The use of digital calibration further improves the linearity of
the power amplifier.
To compensate for receiver imperfections, additional calibration methods are built into the chip, including:
• Carrier leakage compensation
• I/Q amplitude/phase matching
• Baseband nonlinearities suppression
• RF nonlinearities suppression
• Antenna matching
These built-in calibration routines reduce the cost and time to the market for your product, and eliminate the need
for specialized testing equipment.
3.6.3 Clock Generator
The clock generator produces quadrature clock signals of 2.4 GHz for both the receiver and the transmitter. All
components of the clock generator are integrated into the chip, including inductors, varactors, filters, regulators,
and dividers.
The clock generator has built-in calibration and self-test circuits. Quadrature clock phases and phase noise are
optimized on chip with patented calibration algorithms which ensure the best performance of the receiver and the
transmitter.
3.6.4 WiFi Radio and Baseband
The ESP32-S3 Wi-Fi radio and baseband support the following features:
• 802.11b/g/n
• 802.11n MCS0-7 that supports 20 MHz and 40 MHz bandwidth
• 802.11n MCS32
• 802.11n 0.4 µs guard-interval
• Data rate up to 150 Mbps
• RX STBC (single spatial stream)
• Adjustable transmitting power
• Antenna diversity:
ESP32-S3 supports antenna diversity with an external RF switch. This switch is controlled by one or more
GPIOs, and used to select the best antenna to minimize the effects of channel imperfections.
Espressif Systems 39
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ESP32-S3 Series Datasheet v1.2