Patent ID: 9618958
Date: 2017-04-11
CPC Classifications: G05F

Claim:
1. A current generator comprising: a first current generation circuit configured to generate a first current having a first current noise which depends on a change in a supply voltage; a second current generation circuit configured to generate a second current having a second current noise which depends on the change in the supply voltage; and a current subtracting circuit configured to generate a third current with the first current noise and the second current noise removed by subtracting the second current from the first current, wherein the first current is a result of scaling a first reference current generated from the supply voltage at a first ratio, and the second current is a result of scaling a second reference current generated from the supply voltage at a second ratio, and the third current has a rate of change with respect to the supply voltage, which is determined according to the first ratio, the second ratio, a third ratio, and a fourth ratio, wherein the third ratio is a rate of change in the first reference current with respect to the supply voltage, and wherein the fourth ratio is a rate of change in the second reference current with respect to the supply voltage.