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Can opamp work this way ? 
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#1
Aug3011, 01:01 PM

P: 50

can opamp work this way ..?
when i input 2volts the output is 4volts , when i input 5 volts the output is 25 volts in simple words can opamp takes the square of input signals ?? is it possible ? i know how it work as differentiator, integrator, Summing amp but what about squaring ? 


#2
Aug3011, 01:34 PM

P: 5,462

To obtain squares and square roots you need a four quadrant multiplier, such as the MC 1494.
There is an analog solution using the square law characteritic of diodes or FETs but they are tricky to set up. 


#3
Aug3011, 01:37 PM

P: 50

can you please help about using diodes for squaring and square rooting ? what technique we use for squaring ?
like if we Apply n volts the output must b n*n or simply sum of n times , like if we apply 5 volts the output must be 5+5+5+5+5 


#4
Aug3011, 03:48 PM

P: 4,663

Can opamp work this way ?
Review the circuit in
http://www.analog.com/library/analog...f/pdf/19_1.pdf The transistors are working in essentially the transdiode configuration, because they give superior diode lograrithmic performance than real diodes. Look at the equations Eq (1) thru (6). The (kT/q) log function is the ideal diode IV response. Bob S 


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