Digital calibration device for rf system

A digital calibration device for an RF-system, the digital calibration device comprising:

• a first input configured to receive I-channel data;
• a second input configured to receive Q-channel data;
• a first filter coupled to the first input and configured to estimate a DC offset of the I-channel data and to subtract the estimated DC offset from the I-channel data to provide filtered I-channel data;
• a second filter coupled to the second input and configured to estimate a DC offset of the Q-channel data and to subtract the estimated DC offset from the Q-channel data to provide filtered Q-channel data;
• a combining element configured to receive the filtered I-channel data and the filtered Q-channel data and to provide a magnitude value based on the filtered I- and Q-channel data;
• and
• a level detector configured to receive the magnitude value of the filtered I-channel data and Q-channel data and to provide a filter coefficient both for the first filter and the second filter depending on the magnitude value.

A digital calibration device for an RF-system, the digital calibration device comprising:

• a first input configured to receive I-channel data and a second input configured to receive Q-channel data;
• a first filter coupled to the first input and configured to estimate a DC offset of the I-channel data and to subtract the estimated DC offset from the I-channel data to provide filtered I-channel data;
• a second filter coupled to the second input and configured to estimate a DC offset of the Q-channel data and to subtract the estimated DC offset from the Q-channel data to provide filtered Q-channel data;
• a combining element configured to receive the filtered I-channel data and the filtered Q-channel data and to provide a specified magnitude value based on the filtered I- and Q-channel data;
• and
• a level detector configured to receive the specified magnitude value of the filtered I-channel data and Q-channel data and to provide a filter coefficient both for the first filter and the second filter depending on the specified magnitude value;
• wherein the level detector is configured to deliver the filter coefficient depending on specified thresholds of the specified magnitude value.

A method for dynamically removing DC-offset of modulation data of an RF-system, the method comprising:

• receiving I-channel data at a first input and Q-channel data at a second input of a digital calibration device;
• estimating a DC-offset of the received I-channel data and Q-channel data, wherein a proximity of the I-channel-data and Q-channel data to an origin of an IQ-plane is determined;
• determining a specified magnitude value based on the proximity of the I-channel-data and Q-channel data to the origin of an IQ-plane is determined;
• determining a filter coefficient for a first filter and a second filter depending on the specified magnitude value;
• removing the DC-offset from the received I-channel data and Q-channel data depending on the filter coefficient;
• and
• providing filtered I-channel data and filtered Q-channel data.