question about a circuit ( multiplier )

[Zara Zara]

Hello

I found this circuit in an old book , I've drawn the circuit ( attachement) .

With :
- F : clock signal 100 Hz
- M is a DC signal from -5 to +5

The author said that the result is M*F.

Please let me know

thanks in advance
Zara

 

[FvM]

I guess you omitted an important detail. There should be an analog switch connected to node F. The circuit is operating as a sign multiplier then.

 

[Zara Zara]

Hello

I guess you omitted an important detail. There should be an analog switch connected to node F. The circuit is operating as a sign multiplier then.

Sorry FvM, but i didn't understand what's the importance of an analog switch if F does the job in the circuit by switching between -1 and +1 per example.

Please can you help me to conclude a equation of Vout in function of Vin to understand more.

thanks FvM

 

[FvM]

If you are asking about a specific circuit, you should show it completely. The circuit shown in post #1 is a linear OP circuit that can't work as a multiplier.

In case you mean a +/- 1 switchable gain ("sign multiplier") circuit, see this previous thread.
https://www.edaboard.com/threads/289173/

 

[Zara Zara]

Hello FvM

Thanks for your help , i understand the idea now.

Zara