vol voh hysteresis schmitt trigger
Let begin from start.
Trip point for inverter are set to 0.9V.
"i need hysteresis in between 0.7 to 1.1v" is wrong answer, usually for 5V and 3,3V I/O it have value of 300mV. If it isn't constraint, let assume than Vhys=100mV. So Vih=0.95V and Vil=0.85V for typical corner. Turn the schmitt ckt for this values of Vih, Vil.
Because Vhys is small, the result sizes of MOSFET in inverter will be more than ones of positive feedback MOSFETs (10 time for e.g.).
Check corners that trip points of schmitt ckt are in the range of 0,7..1,1V.