MMIC Fabrication Techniques and Wireless Communication Comparisons
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Monolithic Microwave Integrated Circuits (MMICs) are integrated circuits where all active and passive elements, components, and connections are fabricated simultaneously on a single substrate. This is achieved through various deposition techniques, some of which are described below.
The primary MMIC fabrication techniques include:
- Diffusion
- Ion Implantation
- Epitaxial Growth
- Lithography
- Photo Etching
- Deposition
MMIC fabrication necessitates careful selection of the dielectric substrate material and the fabrication process itself. Substrate materials for MMICs are chosen based on their function:
- Substrate Materials: For mounting electronic devices (e.g., Alumina, Ferrite, GaAs, Sapphire).
- Conductor Materials: For printing patterns and creating ground planes (e.g., Aluminium, Copper, Gold, Silver).
- Dielectric Materials: For capacitors and blockers (e.g., SiO, Si3N4, Al2O3, Ta2O5, SiO2).
- Resistive Materials: For bias networks, attenuators, and terminations (e.g., Cr, NiCr, Ta, Ti).
Comparison Questions
- What is the difference between FDM and OFDM?
- What is the difference between SC-FDMA and OFDM?
- What is the difference between SISO and MIMO?
- What is the difference between TDD and FDD?
- What is the difference between 802.11 standards viz. 11-a, 11-b, 11-g, and 11-n?
- OFDM vs OFDMA
- CDMA vs GSM
- Bluetooth vs Zigbee
- Fixed WiMAX vs Mobile WiMAX