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Old 19th October 2007, 09:48 PM   #1
Jeb-D. is offline Jeb-D.  United States
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Default Desired Beta for regulator pass transistor.

In a low current, low noise, series voltage regulator. Is it better to use a low or high beta pass transistor? I can see it two different ways.
-Low beta will be more resistant to noise generated by the voltage reference.
-High beta transistors will pass less supply ripple through, since they tend to have a higher dynamic impedance.

So which one ultimatly gives you a quieter output without using a feedback servo circuit?
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Old 20th October 2007, 06:15 AM   #2
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I can't see any advantage at all to use a low beta transistor but what did you have in mind really and which noise levels?
/Per-Anders (my first name) or P-A as my friends call me
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