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Bootstrap Circuit


Godfather
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Hi to all,

My name is Alex,I'm Romanian and I am a student in third year on electronics(RTV).I have to make a project about Bootstrap circuit ,but since I haven't used it I don't know anything about it.I will sure learn about it on school but later on.So can you give me a general perspective on Bootstrap circuit?What does it do,on what it is used?Olso can you give me an electronic scheme?

Thx you..>!!

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This link shows how bootstrapping reduces distortion by 10 times:
http://www.dself.dsl.pipex.com/ampins/discrete/twoq.htm

The capacitor causes a constant current to flow during signal changes in the transistor's collector resistance. Constant current means the resistor has a higher impedance, so its voltage gain is higher allowing for more negative feedback that reduces distortion.
The capacitor also allows the collector's voltage to rise above the supply voltage on its positive swings, for max output voltage swing from the circuit.

post-1706-14279142691414_thumb.png

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  • 1 month later...

Okay...now from what I'v understand the amplifiers with high imputy resistance , the value of this resistance depends very much on the bias resistance Rb.But stability requires that Rb cannot be very high , therefore it is necessary to use the bootstrap circuit so that high value of input resistance can be obtain with

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Okay...now from what I'v understand the amplifiers with high imput resistance , the value of this resistance depends very much on the bias resistance Rb. But stability requires that Rb cannot be very high , therefore it is necessary to use the bootstrap circuit so that high value of input resistance can be obtain with

post-1706-14279142759485_thumb.png

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