Hello kris,
Thank you for your advice.
I was tried under the following conditions.
Vgpos=0.662V
Vgneg=0.75V
VGAgain=-0.088V
input signal=250mVpp sine wave
But output signal was square wave of 7Vpp.
I was further drop the level of Vgpos, but output signal remained of the square wave.
Please advise the contents to be checked in the other.
Thanks,