Crosstalk Between Finite Ground Coplanar Waveguides Over Polyimide Layers for 3-D MMICs on Si Substrates

Abstract

Abstract-Finite-ground coplanar (FGC) waveguide lines on top of polyimide layers are frequently used to construct three-dimensional Si-SiGe monolithic microwave/millimeter-wave integrated circuits on silicon substrates. Requirements for high-density, low-cost, and compact RF front ends on silicon can lead, however, to high crosstalk between FGC lines and overall circuit performance degradation. This paper presents theoretical and experimental results and associated design guidelines for FGC line coupling on both high-and low-resistivity silicon wafers with a polyimide overlay. It is shown that a gap as small as 6 m between two adjacent FGC lines can reduce crosstalk by at least 10 dB, that the nature of the coupling mechanism is not the same as with microstrip lines on polyimide layers, and that the coupling is not dependent on the Si resistivity. With careful layout design, isolation values of better than 30 dB can be achieved up to very high frequencies (50 GHz).Index Terms-Coplanar waveguide (CPW), coupling, crosstalk, finite difference time domain (FDTD), finite ground coplanar (FGC) waveguide, monolithic microwave integrated circuit (MMIC), polyimide.

Interface Algorithm for Electromechanical Transient Simulation of Power System Based on PSD-Psmodel

“…In general stability calculation, because the speed of the unit does not change much ( . When the electric angle  between the rotor q axis and the rotating reference axis x of the system is in radians, the derivative of  for time is the relative rotational speed between the rotor and the synchronous rotational speed, then Formula (2) can be rewritten into the following equation of state [5]:…”

120 Gb/s-level VCSEL array optical subassembly using passive alignment technique

“…The U-groove was etched to the same depth with the VCSEL thickness for the minimization of bonding-wire length. For high speed transmission lines, a high resistivity silicon substrate was used and the metal lines were designed as an arrayed coplanar waveguide with finite ground [9], [10].…”

Design and Modeling of Spoof Surface Plasmon Modes-Based Microwave Slow-Wave Transmission Line

“…Due to presence of the ground plane on both sides of the CPW, this type of TL has a much wider profile than that of a microstrip TL with the same impedance. Even for the finite ground CPW (FG-CPW), however, the width of the finite ground plane is one of the limiting factors determining the minimum separation of two TLs [25]. Microstrip TLs, on the other hand, with their narrow profile provide a better choice for compact circuit design; however, their noncoplanarity has restrained their adoption in many applications.…”