Problem in SOC integration




Single chip WLAN chip SOC have analog, digital , RF blocks in a single chip, So
single-chip integration can affect the system performance in several
ways. The coupling of switching noise on the supply and bias voltages can
reduce the receive sensitivity, elevate the phase noise and degrade the Error
Vector Magnitude (EVM) of the transmitted signal. Several techniques to
prevent the corruption of sensitive analog and RF signals.
They include the use of fully differential circuits to obtain first-order rejection of
common-mode digital switching noise, the use of separate or star-connected
power supplies to reduce supply crosstalk, the use of on-chip voltage regulators
for sensitive circuits, and the use of a deep N-well trench to reduce substrate
coupling.




IEEE PAPER UNITED STATES