US Patent 7646235 Programmable current generator, current generation method and transmitter arrangement

A programmable current generator includes a decoder unit to generate a first and a second set of control signals as a function of a current control word. The current generator further includes a first and a second array of current sources, wherein the current sources of the first array generate a first current and an auxiliary current, each depending on the first set of control signals and on a reference current. The second array of current sources generates a second current depending on a second set of control signals and on the auxiliary current. An output current is generated depending on the first and the second current.