| 摘要 |
<p>An ordinary LC oscillating circuit (202) generates oscillating waveforms. The waveforms are replenished with replenishing circuitry (219) which generates replenishing signals to the oscillating circuit (202) to maintain the sinusoidal oscillating waveforms in the oscillating circuit (202). The replenishing circuitry (219) includes circuitry which has been optimized to minimize any short circuit current which flows through the transistors of the replenishing circuit. The pull-up and pull-down devices of the replenishing circuit are gradually turned on and gradually turned off so as to minimize the introduction of glitches into the oscillating sinusoidal waveforms. A control circuit (217), such as a phase lock loop circuit, is included to match the frequency and phase of the oscillating waveforms to the external clock reference waveform (REFCLK). Control signals are generated by the phase lock loop circuit to control the pull-up and pull-down devices of the replenishing circuit (219) to adjust the frequency and phase of the oscillating waveforms.</p> |
