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Post subject: Question: difference between RFIC and RF/Microwave circuits Posted: Tue Feb 07, 2006 12:18 pm

What is the difference between RFIC and just plain RF/Microwave circuits? I know one is integrated circuit and one is just more traditional using surface mount(microstrip) etc. But my main question is in what applications do you need RFICs and when do you design just RF circuits.




Post subject: RFPosted: Wed Feb 08, 2006 12:07 pm

RFIC -- active and passive devices integrated on chip -- hence the name integrated circuit.

RF/Microwave -- USUALLY discrete using transmission lines, discrete transistors.



Post subject: Posted: Thu Feb 09, 2006 2:34 am


Joined: Tue Dec 13, 2005 2:42 am

Posts: 5

Location: Czech Rep.

I feel no difference.



Post subject: Difference between RFIC and Microwave CircuitsPosted: Thu Feb 23, 2006 8:15 am


Joined: Fri Feb 17, 2006 12:07 pm

Posts: 218

Location: London UK

Obviously the size, but that comes about because of the high dielectric constant used for RFICs. It means a wavelength in the material is physically very short, so elements that should resonate can be tightly packed together in an RFIC. The dielectric constant for typical microwave substrates is 2.2 compared with 10 or 20 for RFICs.

The electric fields are physically constrained by high e materials in RFICs, so circuit element interaction is less of a problem, compared with Microwave stripline circuits, in which layout is crucial to successful design.


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