| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a radio clock reception circuit capable of improving sensitivity in a radio clock by improving wave detection processing by a digital circuit. <P>SOLUTION: A radio clock reception circuit generates and outputs time information which is binarized from a long-wave standard radio wave and includes time information to be received with an external antenna 1. The reception circuit includes: an AGC 9 for converting an intermediate reception signal including the time information into a digital signal, performing absolute value wave detection by an absolute value detection circuit 6, removing a spurious by a comb-shaped filter 7, and outputting a signal for controlling the gain of the long-wave standard radio wave to be received to a feedback loop for feeding the digital signal with the spurious removed therefrom back to a VGA 3; a D/A conversion circuit 10 for converting an AGC output signal into an analog signal; and also a binarization circuit 11 capable of changing a slice level for the binarization of the digital signal with the spurious removed therefrom. <P>COPYRIGHT: (C)2013,JPO&INPIT |
