Doepfer

> the analog shift register module is some sort of
> a sample&hold module, but with more than one stage.
> like a s&h module, it has a signal input and a clock
> input, but a separate output for each stage.
> on the first clock pulse, the first stage (or cell)
> is filled with the value present at the signal input.
> on the next clock pulse the second stage is filled,
> then the third and so on ...  when all stages are filled
> and the next clock pulse arrives, the module starts
> filling the first stage again and so on.
>
> best wishes
>
> ingo

But that's exactly the function of the T&H section of the A-152 ...

I think it's a bit more complicated and I'd agree to Florian's description
with some corrections:

If I'm not mistaken 8 S&H's and switches are required for a 4 stage analog
shift register (similar to the BBDs) as you need a n additional slave S&H
for each stage. This is required to have the analogue value available to
forward it to the following stage as the preceeding S&H already is
"reloaded" from the stage before. A bit confusing but I think I'm right.

The principle of the analog shift register would be this:


MSH1 -> SW11 -> SSH1 -> SW12 -> MSH2 -> SW21 -> SSH2 -> SW22 -> MSH3 ... and
so on

with
MSH = main S&H of the stage
SSH = slave S&H of the stage
SWxy = switch

The switches SWx1 and SWx2 have to be triggered with opposite phase: all
switches SWx1 are triggered simultaneously at the falling edge of the clock
signal to pass on the voltage of the main S&H (MSH) to the slave S&H (SSH).
All switches SWx2 are triggered simultaneously at the rising edge of the
clock signal to pass on the voltage of the preceeding slave S&H to the next
main S&H.

How about a poll for such a module. Sounds interesting.

Best wishes
Dieter Doepfer