| 摘要 |
PURPOSE: An apparatus for diagnosing ingredients of blood using a PWM method is provided to perform accurately a diagnosis process by using a pre-amplifier for amplifying a weak detection signal and minimizing the influence due to the surrounding noise. CONSTITUTION: An apparatus for diagnosing ingredients of blood using a PWM method includes a first amplifier, a PWM generation unit, a low pass filter, a second amplifier, and a microprocessor. The first amplifier(102) is used for amplifying an analog detection signal of an optical sensor(100) to a predetermined level. The PWM generation unit(110) performs a PWM process for the amplified analog detection signal. The low pass filter(112) is used for filtering a PWM signal of the PWM generation unit. The second amplifier(104) is used for amplifying an output signal of the low pass filter and outputting the amplified signal to an analog/digital converter(106). The microprocessor(108) is used for analyzing a digital signal of the analog/digital converter in order to diagnose ingredients of blood.
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