Data Sheet

3.5 Wi-Fi 3 FUNCTIONAL DESCRIPTION
3.4.2 2.4 GHz Transmitter
The 2.4 GHz transmitter up-converts the quadrature baseband signals to the 2.4 GHz RF signal, and drives the
antenna with a high powered Complementary Metal Oxide Semiconductor (CMOS) power amplifier. The use of
digital calibration further improves the linearity of the power amplifier, enabling state-of-the-art performance of
delivering +20.5 dBm of average power for 802.11b transmission and +17 dBm for 802.11n transmission.
Additional calibrations are integrated to cancel any imperfections of the radio, such as:
• Carrier leakage
• I/Q phase matching
• Baseband nonlinearities
• RF nonlinearities
• Antenna matching
These built-in calibration routines reduce the amount of time and required for product test and make test equipment
unnecessary.
3.4.3 Clock Generator
The clock generator generates quadrature 2.4 GHz clock signals for the receiver and transmitter. All components
of the clock generator are integrated on the chip, including all 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 to ensure the best performance of the receiver and trans-
mitter.
3.5 Wi-Fi
ESP32 implements TCP/IP, full 802.11 b/g/n/e/i WLAN MAC protocol, and Wi-Fi Direct specification. It supports
Basic Service Set (BSS) STA and SoftAP operations under the Distributed Control Function (DCF) and P2P group
operation compliant with the latest Wi-Fi P2P protocol.
Passive or active scanning, as well as the P2P discovery procedure are performed autonomously when initiated
by appropriate commands. Power management is handled with minimum host interaction to minimize active duty
period.
3.5.1 Wi-Fi Radio and Baseband
The ESP32 Wi-Fi Radio and Baseband support the following features:
• 802.11b and 802.11g data-rates
• 802.11n MCS0-7 in both 20 MHz and 40 MHz bandwidth
• 802.11n MCS32
• 802.11n 0.4 µS guard-interval
• Data-rate up to 150 Mbps
• Receiving STBC 2x1
• Up to 21 dBm transmitting power
• Adjustable transmitting power
Espressif Systems 15 http://www.espressif.com