| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for adjusting an atomic clock reception IC, capable of widely using the level of a local frequency signal and allowing a DDS output to be a dynamic range where whole amplitude including a spurious falls.SOLUTION: A method for adjusting a reception IC that generates a digital frequency signal, outputs the signal as an analog local frequency signal, and includes a local oscillation circuit 10 having a PLL circuit and a DDS circuit 1 includes: a process for measuring the characteristics of an intermediate frequency signal after the performance of amplification processing; and a process for adjusting the signal level of a local frequency signal on the basis of the measurement result. The DDS circuit 1 includes a D/A converter 6 for the analog-conversion of a digital frequency signal. The process for adjusting the signal level of a local frequency signal is a process for changing the reference voltage of the D/A converter 6. |
