Patent ID: 9046910
Filing Date: 2015-06-02
Classification: G05F,H03K,H03L

Abstract:
1. A constant current generation circuit comprising: a temperature variable voltage generation unit generating a first variation voltage whose voltage value fluctuates with temperature; a reference voltage generation unit generating a reference variation voltage whose voltage value is smaller in an amount of variation with temperature than the first variation voltage; a variation gradient adjustment unit generating a second variation voltage based on the reference voltage and the first variation voltage; and a current generation unit including a current setting resistor whose resistance value fluctuates with temperature and generating a constant current determined by the second variation voltage and the current setting resistor, wherein the variation gradient adjustment unit sets the coefficient of variation with temperature of the second variation voltage so that the difference between the coefficient of variation with temperature thereof and the coefficient of variation with temperature of the resistance value of the current setting resistor is within a preset first stipulated range, and wherein the reference voltage generation unit generates the reference variation voltage independently of the variation gradient adjustment unit.