Patent ID: 9523994
Filing Date: 2016-12-20
CPC Classification: G05F

Claim Text:
1. A current source comprising: a first current path including a first current mirror transistor, a first cascode transistor and an input current source coupled in series; a second current path including a second current mirror transistor and a second cascode transistor coupled in series, wherein a control terminal of the first current mirror transistor is connected to a control terminal of the second current mirror transistor and wherein a control terminal of the first cascode transistor is connected to a control terminal of the second cascode transistor; a first circuit coupled to a main terminal of the second cascode transistor and configured to provide an auxiliary current in the second current path during a first time period but not during a second time period; and a second circuit coupled to the main terminal of the second cascode transistor and configured to disconnect the second current path from a output node coupled to a load during the first time period and connect the second current path to the output node and load during the second time period to provide an output current to discharge the load.