RF Chip Selection for SDR Transceiver Design

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Discussion Overview

The discussion revolves around the selection of an RF chip or module for a software-defined radio (SDR) transceiver design. Participants are exploring options that include a power amplifier (PA), low-noise amplifier (LNA), and transmit/receive switch, specifically for handling 2.4GHz radio signals without integrated modulation or demodulation capabilities.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant is seeking an RF module that can interface with an antenna and perform signal conversion without modulation/demodulation capabilities.
  • Another participant suggests looking into chips made by Analog Devices, noting their variety in ISM band chips and building blocks.
  • A participant expresses concern about the bandwidth of the chips found, questioning whether higher bandwidth would introduce more noise and if it would cause any issues.
  • There is a request for clarification on what bandwidth is being referred to and whether there are filtering options available.
  • A participant is uncertain about the bandwidth after modulation and is seeking additional information that is not readily available online.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the ideal RF chip, and there are multiple competing views regarding the implications of bandwidth on performance and noise levels.

Contextual Notes

There are limitations in the information available regarding the specific bandwidth requirements and filtering options for the RF chips being discussed.

fidel
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Hi all. I'm designing an SDR transceiver. I need a RF chip/module that at least contains PA, LNA and Tx/Rx switch. It should perform conversion between analog or digital baseband/IF signal and 2.4GHz radio signal. Modulation/demodulation will not be done in this chip. The radio signal is sent/received to/from an antenna.

In short, I want the RF module in the figure below only. DAC/ADC can also be included inside:

Antenna <--> RF Module <--> DAC/ADC <--> Baseband processing <--> ...
-------------------------

I've searched a lot but only seen some wifi/bluetooth/zigbee chip sets that indlude modem also...

Do you have suggestion for such chips? Thank you.
 
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Have you looked at the various chips made by Analog Devices? They have a pretty good assortment of ISM band chips and building blocks:

http://www.analog.com/
 
3x. I just found some from adi. The bandwidth they support is larger than what I desire. Will it cause trouble except that higher bandwidth will let more noise in?
 
fidel said:
3x. I just found some from adi. The bandwidth they support is larger than what I desire. Will it cause trouble except that higher bandwidth will let more noise in?

Which bandwidth? Are there any filtering options?
 
I guess it's the signal BW after modulation, but not sure. I'm requesting more information which is not presented on the web pages.
 

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