ESP8684 datasheet(40/60 Pages) ESPRESSIF

40 / 60 page

4 Functional Description

4.3

Wireless Communication

This section describes the chip’s wireless communication capabilities, spanning radio technology, Wi-Fi and

Bluetooth.

4.3.1 Radio

This subsection describes the fundamental radio technology embedded in the chip that facilitates wireless

communication and data exchange.

4.3.1.1 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, the ESP8684 series integrates RF filters, Automatic Gain Control (AGC), DC offset cancelation

circuits, and baseband filters.

4.3.1.2 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.

Additional calibrations are integrated to cancel any radio imperfections, such as:

• carrier leakage

• I/Q amplitude/phase matching

• baseband nonlinearities

• RF nonlinearities

• antenna matching

These built-in calibration routines reduce the cost, time, and specialized equipment required for product

testing.

4.3.1.3 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.

4.3.2 Wi-Fi

This subsection describes the chip’s Wi-Fi capabilities, which facilitate wireless communication at a high data

rate.

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ESP8684 Series Datasheet v2.0

ESP8684 Datasheet(PDF) 40 Page - ESPRESSIF SYSTEMS (SHANGHAI) CO., LTD.