PULSE WAVE MEASURING DEVICE

摘要

A pulse-wave measurement apparatus includes a pressure detecting capacitor (CX) which changes its capacitance according to the pressure within an artery; an operational amplifier (G1) which is connected at its inverting input terminal to one end of the pressure detecting capacitor (CX) and also is connected at its non-inverting input terminal to a reference voltage; a charge transfer capacitor CF which is connected at its one end to the inverting input terminal of the operational amplifier (G1) and also is connected at the other end to the output of the operational amplifier (G1); a switch (SW1) which is connected at its one end to the inverting input terminal of the operational amplifier (G1); and a voltage setting portion (54) which is connected at its one end to the other end of the switch (SW1) and also is connected at the other end to the output of the operational amplifier (G1), the voltage setting portion (54) being adapted to connect the other end of the switch (SW1) to the output of the operational amplifier (G1) or to disconnect the other end of the switch (SW1) from the output of the operational amplifier (G1) and applies a predetermined voltage to the other end of the switch (SW1).