A demodulation arrangement for a radio signal is disclosed wherein an I/Q mixer converts the radio signal to a real and an imaginary component and supplies the components to a limiting circuit. The limiting circuit limits the amplitude of the signals applied to its inputs. A demodulator circuit receives the output of the limiting circuit and converts the signal components to a demodulated signal including a sequence of pulses. A pulse shaper circuit converts the pulses having pulse amplitudes that are greater than a first threshold value to output pulses having a predetermined first amplitude. This reduces fluctuations in the pulse amplitudes, thus leading to a reduction in low-frequency interference and jitter in the data signal.