| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high frequency transmission reception circuit in which an output of a local oscillator is effectively used. SOLUTION: A transmission signal IF1 with a frequency f1 received from an input terminal 11 is given to an up-converter 12 to which a local oscillation signal with a local oscillating frequency f2 is applied. A high frequency transmission signal HF1 with a frequency f1+f2 and a local oscillation signal component with a frequency f2 are outputted from the up-converter 12. The high frequency transmission signal HF1 and the local oscillation signal component are separated by a frequency separate circuit 14, the former is outputted externally via a high frequency output terminal 15 and the latter is outputted to a frequency mixer circuit 17. A high frequency reception signal HF2 with a frequency f3+f2 received from a high frequency reception terminal 16 is mixed with the local oscillation signal component from the frequency separate circuit 14 at a frequency mixer circuit 17 and the mixed signal is given to a down-converter 18. The down-converter 18 generates the reception signal IF2 with a frequency f3 and the signal is outputted externally via an output terminal 19.</p> |
