[sdiy] OTA as Voltage Controlled Resistor

[Lanterman, Aaron]

On Apr 24, 2013, at 3:33 PM, Justin Owen <juzowen at gmail.com> wrote:

> The LM13700 data sheet shows a schem (Fig. 10) for a 'Floating Voltage Controlled Resistor' - this seems to be a double-ended circuit as opposed to the FET-based circuits (and the the LM13700 circuit in Fig. 9) which (from memory) are single-ended.
> 
> My questions...
> 
> 1) Can the double-ended circuit be used to replace a standard discrete resistor - i.e. is either 'end' replacing a leg/pin of a resistor?


I've had students off-and-on over the years experiment with the double-ended version. It never worked out quite the way they hoped.

- Aaron