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Bipolar transistors.

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There is a difference between BJT (little) and BJT (power). Most people do not know how to make a Power BJT work so they have moved to IGBT which is a BJT with a MOS-Gate, also, people use MOSFETs for power because they are fast and easy to use.
 
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Lightium said:
Good cause I was concerned. I seems like most amps and inverters have strictly moved to MOSFETs.
Click to expand...

As far as I'm aware most amps still use bipolar, unless you're talking Class-D amps? - there was a short term 'fad' for FET amplifiers, but it didn't last long, too expensive, too unreliable, and their supposed 'benefits' weren't true.
 
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Hopefully the linear IC designers chime in on this.

Some thoughts :

www.prosoundweb.com

Amped Up: Inside MOSFET And Bipolar Amplifier Designs - Page 3 of 3 - ProSoundWeb

Is one amplifier technology better than the other? Why?
www.prosoundweb.com www.prosoundweb.com


www.elprocus.com

Difference between BJT and MOSFET : Advantages & Disadvantages

This Article Discusses the Main Difference between BJT and MOSFET, Key Differences, Temperature Coefficient, Advantages and Disadvantages
www.elprocus.com www.elprocus.com

Comparison of Power MOS and Bipolar Power Transistors

This MOS vs. Bipolar Transistor Comparison chart outlines the main differences between these transistor types used for amplification and switching applications
www.allegromicro.com www.allegromicro.com

Excluding RF, other considerations......


Regards, Dana.
 
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Depends upon the application.
BJTs often work better for small signal linear circuits.
MOSFETs or IBTs often work better for switching or power circuits.
 
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Nigel Goodwin said:
As far as I'm aware most amps still use bipolar, unless you're talking Class-D amps? - there was a short term 'fad' for FET amplifiers, but it didn't last long, too expensive, too unreliable, and their supposed 'benefits' weren't true.
Click to expand...
Would there be a benefit to using a fet (or a derivative them) on an receivers front-end?
 
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Lightium said:
Would there be a benefit to using a fet (or a derivative them) on an receivers front-end?
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They have been popular at times, and less so at others, again, cost and reliability are issues - and FET's die much more easily.

For a while the standard front end in radio ham gear was a dual gate MOSFET - who's number I've long since forgotten.
 
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Nigel Goodwin said:
it was the 40673
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I remember that one, but the 3N204 is (or was) lower noise and higher frequency rated, a better 2m & 70cm front-end device.
The 40673 has worst case noise 6db @ 200 MHz, while the 3N204 is max 3.5db @200 MHz and 5db @ 450MHz.

All pretty abysmal now, compared to the later stuff like HEMT devices!
 
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