| 摘要 |
an amplifier(AMP3) for amplifying after comparing an input voltage from an I/V converter with a reference voltage(Vref1) inputted from a reference voltage input terminal(IN1); resistors(R6,R7) for determining the extent of amplification of the amplifier(AMP3); a sample end hold circuit(10) connected to the output of the amplifier(AMP3); another amplifier(AMP4) amplifying after comparing the output of the sample end hold circuit(10) with the reference voltage(Vref2) from a reference voltage input terminal(IN2); a resistor(R8) and a variable resistor(VR1) for determining the extent of amplification of the amplifier(AMP4); and a comparator(COM1) for generating an output of determining infinite distance by comparing the outputs of the amplifiers(AMP3,AMP4).
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