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fully differential OP-AMP question??

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wael_wael

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hi every body,

for the FDA(fully differential OP-AMP) how to measure the gain and the phase, is it between for example the +vout and ground or +vout and -vout
regards
 

wael_wael said:
hi every body,

for the FDA(fully differential OP-AMP) how to measure the gain and the phase, is it between for example the +vout and ground or +vout and -vout
regards
Click to expand...


differential gain = (Vout2-Vout1)/ (Vin2 Vin1)

You can use calculator function from Spectre to plot that graph.
 

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    wael_wael

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you can example the +vout and ground , but gain must increase +6dB
 

Gain is measured with difference of the positive and negative output terminal with referred to the input terminal.
 

use calculator to plot the wave of (Vout2-Vout1)/ (Vin2 Vin1)
 

db((Vo1-vo2)/(vi1-vi2)) gives u gain
phase ((Vo1-vo2)/(vi1-vi2))
 

simply apply an ac source with unit amplitude between the in+ and in- terminals . then plot the gain and phase of the difference between out+ and out- .
 

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