Circuit arrangement and method for reproducing a current

#Various embodiments relate generally to a circuit arrangement and a method for reproducing a current.

#Some applications require the measurement of electric currents, for example for current control or for overcurrent protection. A large current to be measured may be tracked by a smaller current that is easier to handle. Tracking may for example be implemented by using a feedback loop with an operational amplifier. However, operational amplifiers usually have limited slew rates and limited bandwidths due to the capacitances required for stability. When tracking fast changing larger currents, this may lead to a systematic offset of the smaller current. In the worst case, the smaller current is unable to track the larger current.

#In various embodiments, a circuit arrangement is provided. The circuit arrangement may include a first branch, a second branch and a switching feedback structure. The switching feedback structure may be coupled to the first branch and to the second branch. The switching feedback structure may be configured to adjust a current in the second branch to track a current in the first branch.

#In the drawings, like reference characters generally refer to the same parts throughout the different views. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention. In the drawings, the left-most digit(s) of a reference number can identify the drawing in which the reference number first appears. The same numbers can be used throughout the drawings to reference like features and components. In the following description, various embodiments of the invention are described with reference to the following drawings, in which:

#FIG. 1 shows an embodiment of a circuit arrangement;

#FIG. 2 shows another embodiment of a circuit arrangement;

#The following detailed description refers to the accompanying drawings that show, by way of illustration, specific details and embodiments in which the invention may be practiced.

#The word “exemplary” is used herein to mean “serving as an example, instance, or illustration”. Any embodiment or design described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments or designs.

#FIG. 1 shows an embodiment of a circuit arrangement 100. The circuit arrangement 100 may include a first branch 102 and a second branch 104. Both branches 102, 104 may be connected to a common voltage Vin1, which may for example be a supply voltage for the load.