30-11-2012, 05:19 PM
Presentation on monolithic microwave integrated circuits passive components
monolithic.ppt (Size: 774.5 KB / Downloads: 29)
MICROWAVE INTEGRATED CIRCUITS
MIC’s are designed for operation at frequencies of approximately 1GHz or more.
Such components are physically small, in some cases having less than 1sq.mm of surface area.
An MIC can contain an entire electronic device on a single semiconductor.
Types of MIC:-
-Hybrid Microwave Integrated Circuits.
-Monolithic Microwave Integrated Circuits.
Monolithic Microwave Integrated Circuits
They are a most recent development, where all active and passive circuits are grown or implemented in the substrate.
MMIC’s can be made at lower cost because manual labor required for HMIC is eliminated.
A single wafer contain can contain a large number of circuits, which can be processed and fabricated simultaneously.
A MMIC is a integrated circuit device that operates at microwave frequencies(300MHz to 300GHz).
These devices can perform functions such as:-
-microwave mixing
-power amplification
-low noise amplification
-high frequency switching
• Inputs and outputs on MMIC devices are frequently matched to a characteristic impedance of 50 ohms.
MATERIALS USED IN MMIC’s:
MIC’s originally were fabricated using III-V group compound semiconductors(for substrate only) such as GaAs.
GaAs has two advantages over Si, the traditional material for IC realization: device speed and a semi insulating substrate.
InP offer superior performance to GaAs.
GaN is an option because GaN transistors can operate at higher temperature and voltages than GaAs.
Origin software
Proprietary computer for interactive scientifec graphing and data analysis.
Produced by Origin Lab Corporation,and runs on Microsoft Windows.
Data analysis involves:-
curve fitting and peak analysis.
curve fitting performed by non linear square filters.
Files are imported in various formats which are to be analyzed.