| 摘要 |
PURPOSE:To obtain a frequency multiple output having an optional duty ratio by applying an output of a frequency multiplier to an inverting input of an operational amplifier having a negative feedback circuit via an integration circuit and changing a DC voltage fed to a non-inverting input. CONSTITUTION:An input signal A becomes a signal B while being delayed by a phase phi at a delay circuit 2 of a frequency multiplier and a frequency multiple single C after the signals A and B are ORed (3) exclusively. The signal C is applied to the inverting input of an operational amplifier 6 where negative feedback is applied through a resistor 7 as a signal D, and a voltage E is applied from a DC power supply 8 to the non-inverting input of the amplifier 6. Since negative feedback is applied to the amplifier 6, the voltage at the non- inverting input is going to be equal to the voltage E, and a frequency multiple signal F having a duty ratio corresponding to the ratio of the voltage E to a power supply voltage VCC of the amplifier 6 is outputted from the amplifier 6. |
