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It is very difficult to give you any specific advises as you do not
give out any details on the specifications of your intended design.
There exists numerous ways of designing a radio, some with good
points in some aspects, vice versa for others. The way I would
start in designing a radio having a particular chip in mind intended
for the purpose, would be to look for any application notes that the
manufacturers might have. Such often contain useful information,
circuit examples, formulaes etc.
Do not forget to check whether the chip may have alternative
manufacturers (they may have additional application notes) and
also whether there might exist any close equivalents (functionally).
Sometimes different manufacturers make chips that are not exact
equivalents but quite close. Locating such (if they exist) may give
you still more sources for application notes that in turn could give
you more good ideas and examples of useful design approaches.
The url you mentioned is in different language. There is no circuit for that design available. Would you please suggest alternatives if any. I am looking for a stand alone radio, not a PC based.