| 摘要 |
An input circuit of a tuner is provided to prevent a circuit element from being damaged due to an instant high voltage by static electricity with a high pass filter and a static electricity preventing unit. An input circuit of a tuner includes a high pass filter(21) and a static electricity preventing unit(22). The high pass filter filters a high-frequency signal inputted from an antenna into a desired band signal. The static electricity preventing unit discharges an instant high voltage due to static electricity passing the high pass filter and bypasses a high-frequency signal of a strong electric field. The static electricity preventing unit includes coils(L21,L22), condensers(C21,C22), and a reverse diode(D21). The condenser passes the high-frequency signal. The reverse diode discharges an instant negative high voltage and blocks the high-frequency signal. The static electricity preventing unit is connected to the high pass filter in parallel to each other. |
