What's this circuit is used for?

DickCappels

Joined Aug 21, 2008
6,580
It looks a little bit like a sample-and-hold circuit. The voltage across the 2.2 nf capacitor as long as the current sources are powered by the + and - drive signals and when those signals are removed the capacitor (tends to) maintain the same voltage until the next time to take a sample.
 

DickCappels

Joined Aug 21, 2008
6,580
Because by limiting the charging current to a constant value the output changes linearly with time, in other at a rate of some number of volts per second, a opposed to the logarithmic curve of an RC circuit. I think this is common in industrial controls.
 

Thread Starter

evandro bubiak

Joined Aug 4, 2015
12
Because by limiting the charging current to a constant value the output changes linearly with time, in other at a rate of some number of volts per second, a opposed to the logarithmic curve of an RC circuit. I think this is common in industrial controls.
Thank you!!! You opened my eyes!
 

Ramussons

Joined May 3, 2013
871
My memory tells me It is an Analog Switch that uses a Diode Bridge Network.
When the diodes are Forward biased (conducting state), signals from the Left are transmitted to the Right.
When the Diodes are Reverse Biased, the transmission is blocked.
The 2 BJT's form a Constant Current Source.
 
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