| 摘要 |
PROBLEM TO BE SOLVED: To provide a probe for biological monitoring capable of reducing noise and performing transmission of a high frequency signal appropriately.SOLUTION: A probe 1 for biological monitoring includes a feedback circuit K1 as well as a pad part 2, a cable part 3, and a connector part 4. The pad part 2 includes an FET 21, a photodiode 22 and a resistor 23. The connector part 4 includes an operational amplifier 41. The feedback circuit K1 includes the operational amplifier 41, the cable part 3, the resistor 23, which is a feedback resistor, and the FET 21, which is an impedance conversion element. A gate G, which is an input of the FET 21, is connected to a cathode C1 of the photodiode 22, and a drain D, which is an output of the FET 21, is connected to an input of the operational amplifier 41 through the cable part 3. The impedance of the cable part 3 on the input side of the operational amplifier 41 can be reduced. Since the impedance of the cable part 3 is low by this configuration, noise that is generated in the cable part 3 can be suppressed. |
