Patent ID: 6545620
Filing Date: 2003-04-08
Classification: H03M

Abstract:
Current to voltage converter (100) with controllable gain, comprising:an operational amplifier (110) with an inverting input (112) and an output (113); and a feedback resistor ladder network (120) coupled between the output (113) and the inverting input (112) of the operational amplifier (110); wherein the feedback resistor ladder network (120) comprises a main chain (121) exclusively consisting of a plurality of substantially identical unit resistor means (RU) connected in series, and a plurality of branches (124i), each branch (124i) for coupling a node (Xi) in the main chain (121) to the inverting input (112) of the operational amplifier (110); wherein each branch (124i) comprises a selectable feedback switch (123i); wherein the main chain (121) is free from non-unit resistor means (RNU) and wherein non-unit resistor means (RNU), if any, are incorporated in branches (124) only.