| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission/reception circuit without power loss accompanying the detection of transmission power. SOLUTION: This transmission/reception circuit has a transmission/reception changeover switch 13, a transmission power detection changeover switch 18 connected to the received side of the transmission/reception changeover switch 13, a transmission power detection circuit 17 connected to one output terminal of a transmission power detection changeover switch 18, and a reception low noise amplifier 16 connected to the other output terminal of the transmission power detection changeover switch 18. Since power leaking from the transmission reception changeover switch is detected as a transmission power, the transmission power is detected on a reception path and the advantageous effect of not causing power loss accompanying the detection of the transmission power is obtained. |
