Low voltage ACMOS reference with improved PSRR

摘要

A stable voltage reference (12) receives an unregulated voltage (V_dd) as input and provides a low voltage, stable output reference (V_REF). Voltage reference (12) utilizes a cascaded reference cell configuration where the first reference cell comprises a constant current source (18) and a diode (20) and the second reference cell comprises a constant current source (26) and a diode (28). A buffer (24) is configured as a source follower which allows cascading of the two reference cells with minimal voltage drop while providing improved PSRR performance.