| 摘要 |
PROBLEM TO BE SOLVED: To provide signal detecting circuit which never causes mismatching of impedance due to a connection of a detecting circuit. SOLUTION: This circuit is equipped with a 1st circuit 1, a 2nd circuit 3, a low-pass filter 2 connected between the 1st circuit 1 and 2nd circuit 3, and a detecting circuit 15 which detects the signal outputted from the 1st circuit 1. The low-pass filter 2 has at least an inductance element 2a connected in series between the 1st circuit 1 and 2nd circuit 3 and a 1st shunt capacitor 2b which has its one end connected to one end of the inductance element 2a; and the other end of the 1st shunt capacitor 2b is connected to the detecting circuit 5 and a signal is inputted to the detecting circuit 5 through the 1st shunt capacitor 2b. |
