Patent ID: 6549080
Filing Date: 2003-04-15
Classification: H03K,H03L

Abstract:
An electronic circuit, comprising:a digital circuit section outputting an activation signal, said digital circuit section having a selection device for generating selection signals; an analog circuit section connected to said digital circuit section and receiving control signals, including the activation signal and the selection signals, from said digital circuit section, said analog circuit section containing: a common output; at least two controlled current source circuits having inputs, current outputs connected to one another at said common output, logic elements connected to said inputs, and level converters connected to said logic elements, said selection device of said digital circuit section generating the selection signals for selecting at least one of said controlled current source circuit to be activated, the selection signals received at said inputs of said controlled current source circuits being transmitted to said logic elements followed by said level converters for generating switching signals for controlling said current outputs of respective ones of said controlled current source circuits; and a reference current generator connected to said controlled current source circuits, said reference current generator receiving and controlled by the activation signal received from said digital circuit section, said reference current generator having an input receiving the activation signal, a further level converter coupled to said input, and at least two reference current branches coupled to said further level converter, said reference current generator converts the activation signal using said further level converter and generates, by use of said at least two reference current branches, reference currents fed to said controlled current source circuits; a first voltage supply connected to said digital circuit section and supplying a first voltage; and a second voltage supply connected to said analog circuit section and supplying a second voltage being set to a higher potential level than said first voltage.