Out put swing of differential amplifier

[manissri]

differential swing and differential peak

i am desinging the folded cascode differential opamp. for sample and hold amplifier.
my supply is 0 - 5v. my input range is 2Vpp.
my output range is also 2Vpp(peak to peak)
my question is how to measure the output swing ( which should be 2Vpp)
meand in which configuration i put my opamp.and what the input signal should apply at the input, so that i can calculate the output swiing.
regards
manish

 

[moisiad]

output swing of differential amplifier

Try to make a DC sweep analysis, where one input will vary from GND to VDD and the other grounded. Then get the Vin - Vout characteristic.

 

[manissri]

hi moisaid..
will the both input and output will be in unity gain configuration
by putting the resistor of same value from both output to the input .
or what will be the value of resistors if they r used.
reply me
manish'

 

[moisiad]

If the OPAMP is differential then connect the positive output to the negative intput and apply the DC sweep voltage in the positive input. The positive output will remain floating.

 

[manissri]

hi moisaid..
my opamp has differential output.
so as u said that connect the negative output by postive input.
i want to know that will there be any resistor between the negative input and positive input. or i just connect the out put and input.

 

[moisiad]

No resistor. It will operate as a unity gain buffer