sine/cosine wave oscillator

  
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When adding an alternating current signal to the capacitor, the wave position (the phase) of the charging current of the capacitor and the voltage of the capacitor shifts by 90 degrees. When adding an alternating current signal to the coil, it changes contrary to the capacitor. The change of the voltage moves ahead by 90 degrees with the change of
sine/cosine wave oscillator - schematic

the current. When a signal is inputted to the positive input terminal(Noninverting input) of the operational amplifier, the operational amplifier tries to output an in-phase signal as the output. However, because there is a capacitor, the output of the operational amplifier becomes the charging current of the capacitor. The change of the voltage of the capacitor does the change to have been 90 degrees behind with the change of the charging current. Because it is, the output signal voltage of the operational amplifier becomes the signal to be 90 degrees behind from the input signal. When a signal is inputted to the negative input terminal(Inverting input) of the operational amplifier, the operational amplifier tries to output the signal of the antiphase( 180 ° shifted signal ) as the output. Because it is 90 degrees behind in the voltage of the capacitor from the charging current, the output voltage of the operational amplifier becomes the signal to delay 270 degrees ( 180 ° + 90 ° ) from the input signal. At the oscillation circuit which used an amplifier circuit, oscillation operation is done when the phase of the input signal of the amplifier and the phase of the signal which is fed back from the output are in-phase. The circuit which was made this time is using the two integration circuits of the negative terminal input. The phase difference of the input and the output of the two integration circuits shifts by the 540...



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