I am looking for a proper drive for the Zen amplifier, so the question popped up: What if I use my preamplifier to drive the virtual ground of the Zen amplifier directly?
So, can I have separated pre- and power-amplifier with this concept, or will I run into stability problems?
So, can I have separated pre- and power-amplifier with this concept, or will I run into stability problems?
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gain of Zen itself is dominated mostly by R12/R11 ratio ;
stage itself not having enough OLG , so CLG will not be close to ratio of resistors , so I wrote "dominate" , not dictate
if you set R11 value to zero , preceding stage output impedance will take R11 role ...... bringing every bit of phase and frequency misbehaving in place
though , build it and try it
edit : does enclosing overall feedback around entire circuit suit your goals ?
stage itself not having enough OLG , so CLG will not be close to ratio of resistors , so I wrote "dominate" , not dictate
if you set R11 value to zero , preceding stage output impedance will take R11 role ...... bringing every bit of phase and frequency misbehaving in place
though , build it and try it
edit : does enclosing overall feedback around entire circuit suit your goals ?
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That would work to some degree, but it's never a good idea to spread out a virtual ground. In fact, such a node
should be as compact as possible, through good pcb design, to minimize parasitics and noise coupling.
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The nice thing by doing this way, is that the voltage swing on the JFET drain is low, so the distortion in this stage is low. However, if the Zen amp input should be an input to a high gain amp instead (as with an op.amp.), I would fear for the stability.
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