Hello everyone , Can i get a guide on creating a test bench for the following opamp. I'm trying to recreate the gain and phase plots.

You can use any testbench for normal single-ended output opamps. You can find some here: https://github.com/lhrodovalho/sky130_rodovalho_ip__lpopamp/ I've designed a bulk driven opamp for sky130. You should run some DC sweep sims to measure the parasitic input current, as it can be significative when the input pair is the forward-body-bias region. https://github.com/lhrodovalho/AICSP2022RAIL

thanks for the reply @Luis Henrique Rodovalho, can i use the testbenches for fully differential (double ended) opamps, since the op amp in the paper has two outputs

You must adapt them to fully differential. I have other testbenches for full-differential opamps, but they don't have schematics, only spice netlists. https://github.com/lhrodovalho/hybridCHIPS2022/ https://doi.org/10.3390/chips2010001

thanks @Luis Henrique Rodovalho , will have a look at them