about psrr of PTAT reference

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i designed a PTAT reference in 0.18mm process, but i find the psrr is only 48dB (0~1KHz),and above 1KHz, psrr decreased gradually. is that ok? and how to improve it?pls tell me.
 

The simplest option or one very feasible option is put on the output net a capacitor that moving the dominant pole. Other possible effective option is decreasing the nominal value of resistor(s).

Also u can read the following paper available in IEEE:


title={A curvature-compensated bandgap reference with improved PSRR},
author={Xiao Du and Li Wei-min and Zhu Xiao-fei and Fu Xiao-dong},
journal={ASIC, 2005. ASICON 2005. 6th International Conference On},
year={2005},
month={Oct.},
volume={2},
number={},
pages={ 529-533},
 

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