| 摘要 |
A control circuit (7) sets switches (13, 21) in an off-state so that mixers (23i, 23q) mix signals leaking from the mixers (23i, 23q) to a low noise amplifier (22) side and reflected by the low noise amplifier (22). Low-pass filters (24i, 24q) reduce double frequency components of output signals of the mixers (23i, 23q) and input the signals to digital signal processing circuits (27i, 27q), respectively. The digital signal processing circuits (27i, 27q) calculate DC offset components of an I component SI and a Q component SQ, respectively. |
