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Because at baseband you don't have the image problem. When you convert to IF you need to filter the image signal using an external SAW filter (very big and very expensive). Working with a ZIFarchitecture there is not problem (but others present, for istance LO leakage). From my point of view if you have to design a receiver very stable (car radio for istance) you have to convert to IF. If you have to design a receiver for cellular it is better to use the ZIF architecture.
I am new to communication engineering. Is there any good link or reference, that can explain to me what r term like RF, IF, Baseband, really mean? I hope to learn more. Thanks.
Try "RF Microelectronics" By Behzad Razavi. or "Microwave and RF Design of Wireless Systems" by David M Pozar.
A quick answer to Question: The trend in digital domain is to digitize the RF signal as soon as possible. We are seeing more multiple bit (>8bits) High speed ADC (>2GHz) in the market. Ideally, you just need to include a LNA before the ADC, and after digitization, process the data in digital domain.
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Try "RF Microelectronics" By Behzad Razavi. or "Microwave and RF Design of Wireless Systems" by David M Pozar.
A quick answer to Question: The trend in digital domain is to digitize the RF signal as soon as possible. We are seeing more multiple bit (>8bits) High speed ADC (>2GHz) in the market. Ideally, you just need to include a LNA before the ADC, and after digitization, process the data in digital domain.
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