Patent ID: 7155186

Claim:
An AM receiver comprising: an RF input circuit that is configured to receive an RF AM signal, a demodulator that is configured to provide an audio signal carried by the RF AM signal, an automatic gain controller that is configured to stabilize an RF carrier dependent DC level at the output of the demodulator at a substantially fixed stabilization value for RF AM signals having an RF reception fieldstrength above a predetermined threshold value, wherein: the RF input circuit comprises at least one tuneable resonance amplifier that is tuned to the RF AM signal, the automatic gain controller controls the resonance amplifier to increase in both gain and selectivity at a decrease of the fieldstrength of the RF AM signal below the predetermined threshold value, and the automatic gain controller comprises a comparator, and an integrator that provides an integration of the difference between the RF carrier dependent DC level and a predetermined set level, and a time constant of the integrator is chosen to effectuate a high pass filter characteristic for the RF AM signals In the tuneable resonance amplifier.