Patent ID: 7429888
Filing Date: 2008-09-30
Classification: G05F

Abstract:
1. In a dual floating gate voltage reference circuit having two floating gates for storing charge thereon, one or more capacitors coupled to one of said floating gates, and one or more other capacitors coupled to the other of said floating gates, wherein a voltage reference output (Vref) is generated as a function of the difference in charge on said floating gates and wherein the temperature coefficient, Tc, of said voltage refrrence output is substantially a function of the temperature coefficient of said capacitors, a method for improving the accuracy of Vref as a function of temperature, comprising: causing each of said floating gates to change voltage substantially the same amount as a function of temperature by causing the voltages on said capacitors coupled to each of said floating gates to change different amounts with temperature to substantially reduce the temperature coefficient, Tc, of said voltage reference output.