94-GHZ SiGe BiCMOS teknolojisinde faz evireci-değiştirilebilir kazançlı yükselteç

Phased array radar systems are capable of steering the beam of radio waves electronically by adjusting the gain and phase of each antenna element as desired. In order to achieve that, each element has to have gain/phase control and these parameters have to be controlled separately. In W-Band designs, constant gain-360 degree phase control is difficult to achieve due to parasitic effects of high frequencies which may quickly differ across different settings. Dividing the phase control task into different blocks in system eases the design difficulties. A well developed W-Band technology SiGe BiCMOS is also crucial to achieve high frequencies and system control. In this thesis, a 94-GHz SiGe BiCMOS phase inverter with variable gain amplifier is developed. Single bit-180 degree phase inversion enables to use multiple bit-180 degree phase shifter which is easier to design in W-Band. In addition to that, variable gain ampli er allows to use this circuit in phased array systems for amplitude tapering to achieve desired beam forming.