Patent ID: 6111965
Filing Date: 2000-08-29
Classification: H03F,H03G

Abstract:
An electric signal processing circuit in whose signal path a circuit configuration with offset is located wherein the following are provided for offset compensation:a) a switch device for switching the circuit configuration with offset temporarily into a compensation operating state in which it is decoupled from the signal path of the signal processing circuit and held strictly in a dc mode;b) an adding device for adding an offset compensating voltage to the output voltage of the circuit configuration with offset;c) a zero voltage detector for monitoring the output voltage of the adding device for the occurrence of a zero voltage;d) a compensating voltage source which is switched at the beginning of an offset compensating process first into a first operating state in which it gives out a rising or falling compensating direct voltage, and then into a second operating state in which it constantly supplies the compensating direct voltage reached at the time it left the first operating state;e) and a compensating control circuit for controlling the switching state of the switch device and switching the compensating voltage source into its first operating state at the beginning of an offset compensating process;f) the compensating voltage source being switched into its second operating state upon detection of a zero voltage at the output of the adding device by the zero voltage detector, wherein a first controllable switch is disposed in the signal path of the signal processing circuit before the circuit configuration with offset, and a second controllable switch after the circuit configuration with offset.