By Steve Marsh
Monolithic microwave built-in circuits (MMICs) are utilized in a bunch of electronics from mobile telephones and international positioning structures to missile platforms and radar. they're prized for his or her excessive functionality and reliability, yet they are often expensive and hugely tough to provide. right layout is the major to minimizing those difficulties. This useful source is stuffed with real-world layout suggestions and principles of thumb that engineers can use at the task daily to diminish bills and enhance creation caliber. Emphasizing perform over concept, this convenient reference is full of images of actual MMIC designs that express how layout recommendations were effectively applied within the box. as well as circuit layout, the booklet covers modeling, simulation, and checking out, in addition to collection of the proper construction expertise. This worthwhile quantity bargains pros a different inspect the daily practices of MMIC creation and the economics linked to it.
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Extra info for Practical MMIC Design
2 15–20 Poor Lower 4-in. 0) Less mature than Si; 3-, 4- and 6-in. 0 20–30 Poor Lower Less mature than GaAs; Vbr > 100V; 2-in. 9 dB) 1,600 InP 10,000– 12,000 Lower Less mature than GaAs; 2-in. wafers 14 Practical MMIC Design is Si, with much the same benefits and disadvantages as a purely Si process. In a similar way, InP is sometimes grown as an epitaxial layer on a gallium arsenide (GaAs) substrate to get the performance of InP transistors on a larger and better-established semiconductor wafer.
The range of practical track widths on an MMIC process is from around 6 µm to 120 µm, which corresponds to microstrip characteristic impedances of about 120Ω down to 40Ω. 19, and their characteristics are not easily derived from closed-form expressions. 21 shows that some interconnect metal tracks are etched slightly into the substrate material and may sit above or below multiple dielectric layers, which are far from planar around the edges of the metal track where the electric fields are most concentrated.
667 ln (w h + 1444 . 11) In an MMIC process, the substrate height is usually fixed at 100 µm or 200 µm, so the track impedance is set by the track width. The range of practical track widths on an MMIC process is from around 6 µm to 120 µm, which corresponds to microstrip characteristic impedances of about 120Ω down to 40Ω. 19, and their characteristics are not easily derived from closed-form expressions. 21 shows that some interconnect metal tracks are etched slightly into the substrate material and may sit above or below multiple dielectric layers, which are far from planar around the edges of the metal track where the electric fields are most concentrated.