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15th March 2019, 20:10 #1
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Power amplifier delta and K factor <1
Hello, iam design power amplifier, but my delta and K factor is less than 1 What should I do ?

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15th March 2019, 20:19 #2
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Re: Power amplifier delta and K factor <1
Can you please give us a circuit. Sometimes its hard to translate these questions in English.
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15th March 2019, 20:21 #3
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Re: Power amplifier delta and K factor <1
In general people give indication of what their are referring to.
We can assume that you are talking about the loopback gain of a control system.
Being the case, have a look at Barkhausen stability criterion.
Part of the world that you live in, You are the part that you're giving ( Renaissance )

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15th March 2019, 20:32 #4
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Re: Power amplifier delta and K factor <1
, i would to design the power amplifier with transistor CREE CGH40006S if i want to matching impedance is always not matching ,does it affect the stabilizing circuit? because I just give arbitrary resistive value at the input?
Thanks for your explain, but iam sorry i didnt understand

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15th March 2019, 20:41 #5
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Re: Power amplifier delta and K factor <1
iam sorry i didnt understand
Draw some sketch and/or spent more time to depict the "stabilizing circuit".
Part of the world that you live in, You are the part that you're giving ( Renaissance )

16th March 2019, 13:11 #6
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Re: Power amplifier delta and K factor <1
I did not completely understand your question but I am going to go out on a limb and try to guess it.
So you had a transistor, and you found that your Rollett stability factor is less than 1. And you want to know what to do?
K>1 means unconditionally stable but K<1 does not automatically imply your amplifier is going to be unstable. It depends on your load and source impedance. If your load impedance is fixed, you can draw the load stability circle and see if your amplifier is going to be unstable for the load impedance that you are targeting. If no, then you should be fine.
But if yes, then the only thing you can do it place a series resistor with the gate of your device to reduce the gain and see at what point your load lies outside your load (in)stability circle.

16th March 2019, 13:28 #7
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16th March 2019, 14:04 #8
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16th March 2019, 14:58 #9
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16th March 2019, 15:58 #10
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Re: Power amplifier delta and K factor <1
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