Apparatus and a method for handling a received signal, and a mixer unit

An apparatus for handling a received signal, comprising:

• a reception device configured to receive a received signal, wherein the received signal has at least one signal component at a first frequency;
• a mixer unit configured to combine the received signal and a compensating signal using at least one active element in order to obtain a compensated received signal, and to produce a mixer output signal on the basis of the compensated received signal and a local oscillator signal,
• wherein the mixer output signal has a signal component, corresponding to the at least one signal component of the received signal, at a second frequency, the first frequency being higher than the second frequency;
• a compensating unit configured to produce the compensating signal on the basis of an analysis of the mixer output signal, as a result of which noise components in the mixer output signal can be reduced based on the compensating signal,
• wherein the mixer unit comprises a mixer to mix the compensated received signal with the local oscillator signal to produce the mixer output signal, and
• wherein the compensating unit is configured to calculate an absolute value for a complex number during the analysis of the mixer output signal, wherein the complex number has a real portion based on a first phase shift for the local oscillator signal, and an imaginary portion based on a second phase shift for the local oscillator signal, wherein the compensating unit is configured to produce the compensating signal, as a result of which the absolute value of the complex number can be reduced.

An apparatus for handling a received signal, comprising:

• a reception device configured to receive a received signal, wherein the received signal has at least one signal component at a first frequency;
• a mixer unit configured to combine the received signal and a compensating signal using at least one active element in order to obtain a compensated received signal, and to produce a mixer output signal on the basis of the compensated received signal and a local oscillator signal,
• wherein the mixer output signal has a signal component, corresponding to the at least one signal component of the received signal, at a second frequency, the first frequency being higher than the second frequency;
• and
• a compensating unit configured to produce the compensating signal on the basis of an analysis of the mixer output signal, as a result of which noise components in the mixer output signal can be reduced based on the compensating signal,
• wherein the received signal and the compensating signal are voltage signals,
• wherein the mixer unit comprises a mixer, a first transconductance stage and a second transconductance stage,
• wherein the first transconductance stage is configured to convert the received signal into a first current signal,
• wherein the second transconductance stage is configured to convert the compensating signal into a second current signal,
• wherein the mixer unit is configured to sum the first current signal and the second current signal to obtain a summed current signal, and
• wherein the mixer is configured to mix the summed current signal with the local oscillator signal to obtain the mixer output signal.