Data Sheet

22 | P a g e Espressif Systems Oct 12, 2013
ESP8266 802.11bgn Smart Device
12.3 2.4GHz Transmitter
The 2.4GHz transmitter upconverts the quadrature baseband signals to 2.4GHz, and drives the
antenna with a high powered CMOS power amplifier. The use of digital calibration further
improves the linearity of the power amplifier, enabling a state of art performance of delivering
+19dBm average power for 802.11b transmission and +16dBm for 802.11n transmission.
Additional calibrations are integrated to cancel any imperfections of the radio, such as:
 carrier leakage,
 I/Q phase matching, and
 baseband nonlinearities
This reduces the amount of time required and test equipment required for production testing.
12.4 Clock Generator
The clock generator generates quadrature 2.4GHz clock signals for the receiver and transmitter.
All components of the clock generator are integrated on-chip, including:
 inductor,
 varactor, and
 loop filter.
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
receiver and transmitter performance.