Oscillators – Relaxation oscillators
Patent
1997-05-30
1999-11-23
Mis, David
Oscillators
Relaxation oscillators
331111, 331177R, 327175, 324160, 324166, H03B 524, H03K 302, H03K 33565, G01P 350
Patent
active
059907533
ABSTRACT:
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.
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Buchanan John
Danstrom Eric J.
Galanthay Theodore E.
Jorgenson Lisa K.
Mis David
Regan Christopher F.
STMicroelectronics Inc.
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