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Richard Lee's Ultra low Noise MC Head Amp
Richard Lee's Ultra low Noise MC Head Amp
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Old Today, 07:43 AM   #671
as_audio is online now as_audio
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Perhaps Syn should explain where "breaking the loop" took place (post 662).
Maybe I do not understand what is going on.
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Old Today, 08:21 AM   #672
aboos is online now aboos  Germany
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Location: Bondorf
R4 in this case is both the load resistor and the feedback resistor . Open loop in this case means to open the connection of R4 at the input node and connect it to ground instead.
So open loop gain is 2*gm*R4.

As the open loop gain is not very high (approx. x560 at 10 mA Ic), gain of the amp with closed feedback loop will be a liitle bit smaller than R4/R3
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Old Today, 08:37 AM   #673
as_audio is online now as_audio
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Open loop is without R4.
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