control word
3.It is implemented in SMIC 0.18μm, the layout of 4.8~6GHz I/Q LO buffer occupies a total die area of 650×550μm 2 . Post simulation shows that the phase shift of the I or Q LO buffer varies almost linearly from 0° to 8° with the action of 5bit control word, whereas the output power of the LO buffer varies within 0.2 dB.

