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Old 5th January 2004, 06:52 PM   #1
Pedja is offline Pedja  Serbia
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Default Non global feedback regulated supply for GC

I uploaded some info about the non-feedback regulator for GC, some of you might be interested for reading.
http://www.users.verat.net/~pedjarog...ies.htm#non-fb

Pedja

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Old 5th January 2004, 07:06 PM   #2
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Have you tested the PSRR together with a LM3875? The IC itself has PSRR of 117 dB in the audioband, how much improvement do you really get? Isn't it better dynamics in no regulator at all (straight wire)? How about high current impedance?
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Old 5th January 2004, 07:39 PM   #3
Pedja is offline Pedja  Serbia
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The graphs you see are simulated. Real measurement of PSRR would take me some time (not the measurement itself, but making of set-up for this).

If you think about numbers, then I can agree you can’t gain anything sensible this way. But if you decide just to listen to the consequences, you can, for example, note that you can easily hear the change of the voltage reference (that anyway seats between the current source and low pass filter and that is not amplified). Yes, in the supply that anyway has 60dB PSRR and which feeds the circuit with 100dB+ PSRR.

Output impedance rapidly decreases when the drawn current increases. When it reaches 1A or going higher, the output impedance (its absolute value) of such regulator can compete to the majority of regulators with global feedback, but with that advantage of having smoother inductive raise. If you consider the simulation reliable, the output impedance of this regulator while it puts out 1A is attached.

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