| 摘要 |
PURPOSE:To eliminate an spurious harmonic component while minimizing the signal delay by providing a means inserting a varactor diode between a signal line and a power supply, or between a signal line and ground, or between the signal line and the power supply and also between the signal line and ground to the circuit. CONSTITUTION:When the output of an OSC is at a high level, the potential difference between the output of the OSC and a power supply Vcc is almost zero, a static capacitance of a diode 2 is maximum. When the output of the OSC is at a low level, the potential difference between the output of the OSC and ground is almost zero, a static capacitance off a diode 3 is maximum. When the output of the OSC is almost at a threshold voltage, a voltage of about Vcc/2 is applied to the diodes 2, 3 respectively. When the diodes whose static capacitance does not give any effect on a signal waveform from the OSC in this voltage state are selected, a spurious harmonic component is eliminated while minimizing the signal delay. |
