Patent ID: 8872578

Claim:
A self adjusting reference for an input buffer, comprising: an input node that receives an input voltage; an adjustable voltage shifter that provides a plurality of adjustable reference voltages based on a primary reference voltage, wherein said plurality of adjustable reference voltages includes a midway reference voltage, an upper reference voltage which is greater than said midway reference voltage, and a lower reference voltage which is less than said midway reference voltage; a comparator that compares said midway reference voltage with said input voltage to provide an input sense signal indicative of a voltage state of said input voltage; and a comparator and adjust circuit that increases said voltage levels of said plurality of adjustable reference voltages when said input voltage is in a low voltage state and has a voltage level that is greater than said lower reference voltage, and that decreases said voltage levels of said plurality of adjustable reference voltages when said input voltage is in a high voltage state and has a voltage level that is less than said upper reference voltage.