Design of the Passive Transmission Lines for Different Stripline Widths and Impedances

In this paper, a practical method for designing of passive transmission lines (PTLs) in different widths ranging from 5 to 20 μm with their respective driver and receiver circuits is demonstrated. The striplines were simulated with a microwave analyzing tool and their equivalent circuit models were extracted. Then, this model is used to design the driver and receiver circuits by analytical calculations. Circuits were fabricated at the AIST STP2 process and bias margins and bit error rates were measured in a closed cycle cryocooler system. In order to compensate the critical current's global shift in the fabrication, the tests were carried out in two different temperatures of 4.2 and 4.7 K. We have achieved 10% and 30% margins for receiver and driver circuits, respectively, for 20-μm width striplines.