| 摘要 |
PROBLEM TO BE SOLVED: To provide an AFC circuit which makes a base station or a calling terminal follow a frequency even in the case that a frequency deviation Δf from the base station or the calling terminal meets relation 1/8<=|Δf.T|<1/4 (T: symbol period) in a terminal reception device using a delay detection system. SOLUTION: The AFC circuit is provided with a level comparison part which compares and discriminates a reception power before VCXO control and that after VCXO control, an AFC correction part which takes phase error information of an AFC part output and discrimination information of the level comparison part output as inputs to calculate and output phase information, and a switch SW which takes the AFC part output and the AFC correction part output as inputs and switches output information by a radio control part, and the VCXO is controlled by phase error information of the AFC part output, and the VCXO is controlled by phase information of the AFC correction part output. |
