ABSTRACT

The main purpose of this design is to provide a stable reference voltage for a switch magnetism-sensing circuit. Because of the inherent characteristics of the circuit, the reference voltage is set to 3.3 V. In this paper, the reference voltage source is designed to have a wide input range, a stable output and a good temperature characteristic. The simulation results of the reference voltage and the complete design layout are described. The simulation results based on a 4 μm 25 V bipolar process verify the correctness of the theoretical analysis and the feasibility of the proposed methods.