| 摘要 |
The invention relates to a multi-phase inverter ring oscillator generating multiple output signals arranged in groups of four. In an example embodiment, an even number of inverters (210, 220, 230, 240) are coupled together in a cascaded series, each inverter has an input and an output, the output of one inverter is coupled to the input of a next sequential one of the inverters. There are a corresponding number (215, 225, 235, 245) of cross-coupled transistors. Each cross-coupled transistor couples the input of one inverter to the output of the next sequential one of the inverters. In a particular example embodiment, a four-phase inverter ring oscillator generates four output signals that are shifted 90 DEG in phase and may be used to generate 50% duty cycle clocks. |
