Re: Amplifone Design... Wonders me

I have been searching on the 'net to find information on Transductance
amplifiers (voltage to current) such as our favorite examples are :)

It seems very hard to find a full and detailed description going into the
more complex matters such as PSRRR.

One thing seems to be a clear fact: when Rs (Shunt Resistor, in our
deflection bords being the big 1.5 ohm 10W N.I. resistor) become smaller,
the stability of the amplifier decreases.

When Rs increases in value, the stability gets better but the bandwith goes
down.

Since the bandwith that is given for the average current feedback amp is
above 100 Mhz (ours probably less due to the fact it is a hi-current amp),
maybe increasing the Rs may get rid of this very bad PSRRR.

What do you think, guys?

----- Original Message -----
From: Zonn <zonn@zonn.com>
To: <vectorlist@vectorlist.org>
Sent: Wednesday, March 10, 2004 8:09 PM
Subject: Re: VECTOR: Amplifone Design... Wonders me

> On Wed, 10 Mar 2004 03:08:11 -0600, Rodger Boots
<rlboots@cedar-rapids.net>
> wrote:
>
> >>
> >>Since the Yoke and Resistor act like a voltage divider, and the voltage
at FB is
> >>held constant, then when V is at 25v, there is 1v across FB and 24v
across the
> >>yoke. Now when V jumps up to 30v, FB is still held to 1v, but now there
is 29v
> >>across the yoke.
> >>
> >>
> >
> >No, the yoke voltage doesn't change, the drop across the output
> >transistors changes.
> >
> Thanks Rodger, that makes perfect sense!
>
> So would low gain, or a slow slew rate in the amplifier, allow ripple in
the
> power supply to make it through to the yoke?
>
> Power supply regulation does stabilize the display, and I'm just wondering
why
> that would be the case.
>
> -Zonn
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Received on Wed Mar 10 16:23:38 2004