Communication unit

A communication unit comprising:

• a first low-noise amplifier that receives and amplifies a sixth signal and that outputs a fifth amplified signal, wherein the fifth amplified signal is amplified according to a third generation (3G) or a fourth generation (4G) communication standard;
• a second low-noise amplifier that receives and amplifies a seventh signal and that outputs a sixth amplified signal, wherein the sixth amplified signal is amplified according to a fifth generation (5G) communication standard, the 5G communication standard including at least one frequency band that is higher than all frequency bands of the 3G and 4G communication standards;
• a second signal generating circuit that generates an eighth signal, wherein the eighth signal has a frequency lower than a frequency of the sixth amplified signal, and is based on the sixth amplified signal and a third reference signal;
• a third filter circuit that receives the eighth signal and outputs a filtered eighth signal by passing one of and attenuating the other of a frequency component representing a sum of the frequency of the sixth amplified signal and a frequency of the third reference signal, and a frequency component representing a difference between the frequency of the sixth amplified signal and the frequency of the third reference signal;
• and
• a first receive circuit that outputs a first output signal based on the fifth amplified signal or the filtered eighth signal output from the third filter circuit,
• wherein the first receive circuit receives the fifth amplified signal, and selectively receives the filtered eighth signal, from a common terminal of the first receive circuit.