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how to vary resistance by varying voltage

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rameshdanas

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How to vary resistance by varying voltage . Please share your views regarding this
ramesh
 

JFET can be used for this purpose...... JFET is operated in the linear region and its GATE voltage is varied suitably to vary its resistance because the curve depends on the Vgs and so the resistance depends on the Vg.........


to get the idea clearly check out.....
**broken link removed**
 
here is one paper about variable resistor using MOS!

may it will be helpful.
 
MOSFET can be used as a voltage--controlled,when it operate in linear area,you can get detail information from the Design of Analog CMOS Integrated Circuits by Behzad Razavi\][/i][/quote]
 
rameshdanas said:
How to vary resistance by varying voltage . Please share your views regarding this
ramesh
Click to expand...

MOS RDS is the resistance varying with voltage
 
A transonductance Opamp (OTA) can be used as a voltage-controlled-resistor.
Take a look at pg. 11 of the National Semiconductor LM13700 data sheet.
 
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