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Programmable Voltage Reference Circuit Using an Analog Floating Gate Device

Voltage references are an integrated circuit component used to provide stable references. They provide a voltage that is generally independent of supply voltage and temperature and have a variety of applications in control systems and data converters where there is a need for a fixed voltage. Much research has occurred in developing reliable and low power reference circuits. We here discuss improvements to voltage reference circuit that employs an analog floating gate (AFG) device to generate programmable reference voltages. The approach taken here allows us to maintain accuracy of reference voltage over a very wide range of supply voltage and trim to any desired reference voltage from 0.4 to 3.1 volts.