Apparatus and method for eliminating outband interference signal

An apparatus for eliminating an interference signal, comprising:

• a balun transformer dividing a received signal containing an outband interference signal into a first signal and a second signal that are identical to each other;
• a first mixer downconverting the first signal and the second signal;
• a filter unit extracting the downconverted outband interference signals from the downconverted first signal and the downconverted second signal;
• a second mixer upconverting the extracted outband interference signals to restore the outband interference signals to the original frequency band;
• and
• an operation unit subtracting the restored outband interference signals from the first signal and the second signal.

An apparatus for eliminating an interference signal, comprising:

• a first mixer downconverting a received signal containing an outband interference signal;
• a filter unit extracting the downconverted outband interference signal from the downconverted received signal;
• a second mixer upconverting the downconverted outband interference signal to restore the outband interference signal to the original frequency band;
• an operation unit subtracting and eliminating the restored outband interference signal from the received signal;
• a variable attenuator controlling the amplitude of the outband interference signal before the restored outband interference signal is provided to the operation unit;
• a delay unit delaying the received signal by a predetermined time in consideration of the process times of the first mixer, the filter unit and the second mixer and providing the resulting signal to the operation unit;
• and
• a low-noise amplifier low-noise-amplifying the received signal without the outband interference signal.

A method for eliminating an interference signal, comprising:

• downconverting a received signal containing an outband interference signal;
• extracting the downconverted outband interference signal from the downconverted received signal;
• upconverting the downconverted outband interference signal to restore the outband interference signal to the original frequency band;
• and
• eliminating the restored outband interference signal from the received signal.