[sdiy] SSM2164 to use as ring modulator...

[Mattias Rickardsson]

On 14 February 2014 12:13, Neil Johnson <neil.johnson71 at gmail.com> wrote:
>
>> I'm curious about how this could be achieved with just a linear VCA.
>> By adding a DC offset to the modulator so that it remains positive,
>> and then removing the corresponding fraction of the carrier from the
>> output?
>
> Yes, its a technique that's been known and used for at least 30 years.
>  Check the LM13700 datasheet, e.g. figure 27:
>
>     http://www.ti.com/lit/ds/symlink/lm13700.pdf
>
> Or this magazine article on page 8:
>
>     http://www.idea2ic.com/LM13600/UsingOTAs2.pdf

Wouldn't this connection mean that you keep the 2164 output at some
other voltages than the virtual ground they are specified for?

I've seen the output (mis?)used that way in some of the 2164 filter
schematics out there, but only connected them to virtual earths
myself. The datasheet says Output Compliance +/- 0.1 V. How does it
behave outside that range?

On 14 February 2014 04:00,  <rsdio at sounds.wa.com> wrote:
> If there are distortion characteristics in the SSM2164 that you like

Yesterday I found the input clipping distortion characteristics of the
2164, and it surely wasn't something to like! :-)
I also found how much more noise the Class A setting gives, pschhhhhh...

/mr