Component tolerances and mismatches due to process variations severely degrade the performance of bandgap reference (BGR) circuits. In this paper, the authors describe the design of a BGR considering the Pelgrom's mismatch model. The main purpose of our methodology is to convey the design to reach a good trade-off between area and mismatch. Implemented in standard 0.35mum CMOS technology, the circuit also includes a straightforward 4-bits trimming circuit to achieve more process variations independence. Its Monte Carlo temperature coefficient average is 40-ppm/degC and the reference output voltage average is 1.230V. The area of the BGR is 400x350mum2 due to our design matching requirements.