Abstract: Devices and methods for layout-dependent voltage handling improvement in switch stacks. In some embodiments, a switching device can include a first terminal and a second terminal, a radio-frequency signal path implemented between the first terminal and the second terminal, and a plurality of switching elements connected in series to form a stack between the second terminal and ground. The stack can have an orientation relative to the radio-frequency signal path, and the switching elements can have a non-uniform distribution of a first parameter based in part on the orientation of the stack.

Abstract: The invention relates to a cell culture apparatus for cultivating cell spheroids, comprising at least one compartment having n compartment walls which define a compartment base area and a volume VK above the compartment base area and a multiplicity of microwells having p top edges and a volume VM, wherein the microwells are arranged in the compartment base area such that the compartment base area outside the microwells merely has inclined surfaces, the number of microwells is chosen such that the entire compartment base area is covered with microwells, all the microwells have the same volume VM and the microwells have the shape of a pyramid or a cone having a rounded tip for accommodation of cells and additionally rounded edges between the tip and the base of the pyramid or the cone.