Patent ID: 7460841

Claim:
A circuit arrangement, comprising: first and second adjustable amplification devices, wherein a signal output of the first amplification device is coupled to a signal input of the second amplification device, and wherein the first amplification device comprises a digital control amplifier having a control input, and the second amplification device has a control input for controlling a gain thereof; a control unit coupled to the control inputs of the first and second amplification devices, and configured to provide control signals thereto such that a change in the gain of the second amplification device in one direction is effected by a change in gain in the first amplification device in the opposite direction; and a level detection device connected to the signal output of the first amplification device, and configured to perform a level comparison of the signal output with an upper and a lower limit value, and output a comparison signal at an output thereof, and provide the comparison signal to the control circuit.