| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a transmission and reception circuit, capable of keeping and improving the reception performance of a reception circuit by removing noise, in a receiving band included in a transmission wave from the reception circuit. SOLUTION: A part of the transmission wave is extracted from a transmission analog circuit 40 by a extraction part 34. Noise in the receiving band is taken out by a filter 61 from a part of the extracted transmission wave and the level and the phase of the noise are adjusted by respective adjusters 62 and 63. Then, the noise is inputted to a reception analog circuit 50, to allow an adder 64 to offset and remove the noise in the reception band, included in a leaked wave (transmission wave) mixed into the reception signal of the circuit 50.</p> |
