| 摘要 |
<p>A precision oscillator includes a capacitor, a charging current source, a discharging current source, a switch for alternatingly connecting the capacitor to the charging current source and the discharging current source, and a hysteretic comparator connected to the capacitor for producing an oscillating signal responsive to charging and discharging the capacitor. The oscillator may also preferably include a duty cycle controller connected to at least one of the charging current source and the discharging current source for setting the charging current and/or the discharging current to thereby set a duty cycle of the oscillating signal by setting a ratio of the charging and discharging currents. The charging current source may have a current setting input for permitting setting of a charging current to the capacitor, and the discharging current source may have a current setting input for permitting setting of a discharging current from the capacitor. The current setting inputs are connected to the duty cycle controller which, in one embodiment, may be provided by a processor and respective digital-to-analog converters. <IMAGE></p> |
