| 摘要 |
PURPOSE:To reduce variations in amplitude of detected sine wave output by controlling the amplitude of an output signal obtained from an amplifier of the detected output of a magnetic sensor for every issuance of signal at every mechanical angle obtained from condition control signals to make the amplitude almost fixed. CONSTITUTION:A series circuit of an analog switch S1 and a resistor R1, a series circuit of an analog switch S2 and a resistor R2... and a series circuit of an analog switch Sn and a resistor Rn are connected in parallel with the feedback resistor R of an operation amplifier 5 which processes the detected output so of a magnetic sensor. Control signals c-e having phase differences of a mechanical angle 120 deg. from one another are added to a logic circuit 6 to transform into pulse signals 1-6 issued at every mechanical angle 60 deg., and analog switches S1-Sn are changed over arbitrary by these pulse signals l-6 so that the post-amplification amplitude of the detected output e0 may become almost fixed. |
