A floating voltage regulator with output level sensor for applications with variable high voltage supply in the range of 8.5 V to 35 V

In this paper we present the design and implementation of a linear voltage regulator using a 0.6μm CMOS high voltage process. The circuit provides a “floating ground” of 5 V below a supply voltage that can vary between 8.5 V and 35V. An additional feature of a voltage level sensor, generating a low voltage signal that advise the state of the regulator is provided by the circuit. The proposed topology, calculations, simulations and measurements of the implemented circuit are exposed in this work. The area of the floating regulator circuit is 599μm × 329μm, the measured output voltage presents a 2.5% standard deviation from the designed voltage.