Receiving device for signal-sensitive reception of radio signals, in particular for use in radio astronomy, having a housing, having at least one input terminal which is provided on the housing and is coupled to a receiving antenna of the receiving device to receive radio signals or can be coupled to an external receiving antenna, having a plurality of similar receiver circuits (13, 14) which are connected within the housing such that they have signal trains which can be operated independently of one another, wherein the signal train of each receiver circuit (13, 14) each has an amplifier (22, 23) and a processing means (24, 25), including a digital processing means, which is connected downstream of this amplifier (22, 23), having a controllable switching apparatus which is designed to cyclically connect the plurality of signal trains of the receiver circuits (13, 14) to the input terminal by switching one after the other, having an output-side summation apparatus which is designed to sum the output signals (S2, S3) which are present on the output side of each of the receiver circuits due to cyclic switching, and having a single A/D converter which can be switched to each signal train between the amplifier (22, 23) and the processing means (24, 25) via the controllable switching apparatus and is intended to digitize an analog received signal which is amplified by each amplifier (22, 23) and to supply it to each downstream digital processing means (24, 25), wherein each signal train has a dominant noise source (34, 35) which is determined by the amplifier (22, 23) which is provided on the input side in each signal train, and wherein the dominant noise sources (34, 35) in the different signal trains are different and not correlated with one another. having a housing, having at least one input terminal which is provided on the housing and is coupled to a receiving antenna of the receiving device to receive radio signals or can be coupled to an external receiving antenna, having a plurality of similar receiver circuits (13, 14) which are connected within the housing such that they have signal trains which can be operated independently of one another, wherein the signal train of each receiver circuit (13, 14) each has an amplifier (22, 23) and a processing means (24, 25), including a digital processing means, which is connected downstream of this amplifier (22, 23), having a controllable switching apparatus which is designed to cyclically connect the plurality of signal trains of the receiver circuits (13, 14) to the input terminal by switching one after the other, having an output-side summation apparatus which is designed to sum the output signals (S2, S3) which are present on the output side of each of the receiver circuits due to cyclic switching, and having a single A/D converter which can be switched to each signal train between the amplifier (22, 23) and the processing means (24, 25) via the controllable switching apparatus and is intended to digitize an analog received signal which is amplified by each amplifier (22, 23) and to supply it to each downstream digital processing means (24, 25), wherein each signal train has a dominant noise source (34, 35) which is determined by the amplifier (22, 23) which is provided on the input side in each signal train, and wherein the dominant noise sources (34, 35) in the different signal trains are different and not correlated with one another.