LOW IMPEDANCE TRANSMISSION LINE

摘要

A system (100) has a transmission line (104) coupled to a balun (102) at its center tap (120). Typically, transmission line (104) carries signals in the frequency range of about 160GHz (for example) and can have a length of about 20µm. To adjust the impedance applied at the center tap (120), the transmission line units (112-1 to 112-9) of transmission line (104) are varied around the center tap (120). Transmission line units near (i.e., 112-1 to 112-3) the center tap 120 cascade in decreasing height. Each of these transmission line units (112-1 to 112-9) generally comprises a MOS capacitor, a metal capacitor, and a coplanar waveguide.