You can estimate ON resistance of Analog Switch by Vout/Iout, but it depends on the structure of Analog Switch.
For example, if Analog Switch is composed of Transmission Gate, the ON resistance is :
[Vds(pmos)/Ids(pmos)]//[Vds(nmos)/Ids(nmos)] , or
Vab/Iab, where Vab is the ON Voltage of TG, Iab is the ON current of TG.
hi,
The switch comprises of two TG , an inverter for control and a pulldown transistor. The setup provided to us is, a bias voltage connected to input pin, input voltage source which need to be varied. So is that we should measure current at out and vout at outpin to calculate RON.
You can't calculate Ron only by Vout/Iout,
but you can calculate Ron by (Vin-Vout)/Iout,
you can simulate by HSPICE, and you should find the difference.
hi i am uploading the setup of on resistnace measurement, in which Vbias=xuvolts and vin is swept between 0 to VDD, So can you tell me how to measure Ron in this case.
put a amperometer in serie.
the ron is different if vin>vout or vout>vin, and decreas if cmos analog switch is alimentated from 15v instead 5v. make experience doing tests measurements