| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a pulse wave measuring device capable of reducing errors in detecting pulse waves by preventing the output characteristics from becoming non-linear. <P>SOLUTION: The pulse wave measuring device 100 comprises: a pressure detecting capacitor CX whose electrostatic capacity varies according to the pressure in the arteries; an operation amplifier G1 with a reverse input terminal connected to one end of the pressure detecting capacitor CX and with a non-reverse input terminal connected to the reference voltage; a charge transfer capacitor CF whose one end is connected to the reverse input terminal of the operation amplifier G1 and the other end is connected to the output of the operation amplifier G1; a switch SW1 whose one end is connected to the reverse input terminal of the operation amplifier G1; and a voltage setting part 54 whose one end is connected to the other end of the switch SW1 and the other end is connected to the output of the operation amplifier G1. The voltage setting part 54 applies a prescribed voltage to the other end of the switch SW1 by connecting the other end of the switch SW1 to the output of the operation amplifier G1, or by disconnecting the other end of the switch SW1 from the output of the operation amplifier G1. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
