Method for the evaluation of a first analog signal and a second analog signal, and evaluation circuit corresponding therewith

An evaluation circuit for a first analog signal and a second analog signal, comprising:

• analog signals substantially sinusoidal and out of phase by about 90° relative to each other when an element moves in a temporally uniform manner relative to a stationary element, the first analog signal or the second analog signal are send to at least two AD converters;
• the AD converters digitize the analog signals that are send to them at a scanning frequency, wherein the scanning frequency of the AD converters is more than twice as large as a maximum frequency, to output digital signals of the AD converters correspond to the received analog signals;
• an evaluation block configured as a hardware circuit, calculates the arc tangent in real time and includes a computing block to which the digital signals are send;
• a connection between the AD converters and the evaluation block to send the digital signals from the output of the AD converters to the evaluation block, wherein the evaluation block is configured such that it determines from the digital signals fed to it in real time an arc tangent corresponding to the digital signals and correction values for the first and the second signal;
• and
• a correction-value add-on block that is configured as a hardware circuit is arranged between the AD converters and the evaluation block;
• wherein
• the correction values are send to the correction-value add-on block by the evaluation block and the digital signals by the AD converters, and wherein
• the correction-value add-on block corrects the digital signals by the correction values and
• the correction-value add-on block outputs the corrected digital signals to the evaluation block.