Circuit for improving the tuning behavior of a receiver frequency control loop

摘要

The invention relates to a receiver circuit comprising a loop in which the oscillator frequency is controlled by the useful signal. The loop gain in the useful tuning range is negative and greater than unity. An attenuator is provided which is controlled by a control circuit so that larger deviations of the intermediate frequency loop from a target value result in the loop gain being reduced, improving the receiver tuning behaviour.