Kevin Weddle Posted January 27, 2010 Report Share Posted January 27, 2010 MOSFETS and biploar transistors are very similar. MOSFETS don't have base current, which seems easier for design purposes. And their transfer curve is much better.Why are MOSFETS only used in output power stages? Quote Link to comment Share on other sites More sharing options...
Hero999 Posted January 27, 2010 Report Share Posted January 27, 2010 BJTs have the following advantages over MOSFETS:The input is not capacitive. They're cheaper. The turn-on voltage is only 0.6V which means they can be used in very low voltage circuits <1V. They have a higher gain. BJTs are more resistant to ESD than MOSFETs.I've answered your question under the condition that you don't fill the rest of the thread with random comments which are often incorrect. If you want to ask more questions then you're free to do so but please make it clear what you're asking. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted January 27, 2010 Author Report Share Posted January 27, 2010 Turn-on voltage .6V. All designs are depenedent on voltage and curent. Voltage is a real consideration. But you can use any value of voltage for a circuit. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted January 27, 2010 Report Share Posted January 27, 2010 No you can't use any voltage you like.What if you're restricted to using a single AA cell? Then you're limited to 1.5V. Quote Link to comment Share on other sites More sharing options...
Kevin Weddle Posted February 11, 2010 Author Report Share Posted February 11, 2010 Most designs can't account for the linearity difference between bipolar transistors and MOSFETS. But very large designs suffer from linearity problems, component manufacturing, design etc. Quote Link to comment Share on other sites More sharing options...
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