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Definition of "monolithic microwave integrated circuit (MMIC)" |
integrated circuits made of gallium arsenide (GaAs), silicon, or other semiconducting materials where all of the components needed to make a circuit (resistors, inductors, capacitors, transistors, diodes, transmission lines) are formed onto a single wafer of material using a series of process steps. Attractive features of MMICs over competing hybrid (combination of two or more technologies) circuits are that a multitude of nearly identical circuits can be processed simultaneously with no assembly (soldering) using batch processing manufacturing techniques. A disadvantage is that circuit adjustment after manufacture is difficult or impossible. As a consequence, significantly more effort is required to use accurate computeraided- design (CAD) techniques to design MMICs that will perform as desired without adjustment. Of course, eventually assembly and packaging of MMICs is performed in order to connect them into a system such as a DBS receiver. MMICs are only cost effective for very high volume costs, because the cost of the initial design is very high, as is the cost of wafer manufacture. These costs can only be recovered through high volume manufacture. (The word “monolith” refers to a single block of stone that does not (in general) permit individual variations). |
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