Oscillators – Automatic frequency stabilization using a phase or frequency... – Particular frequency control means
Reexamination Certificate
2005-06-28
2005-06-28
Choe, Henry (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
Particular frequency control means
C331S17700V
Reexamination Certificate
active
06911869
ABSTRACT:
There is disclosed a voltage controlled oscillator (VCO) that receives +V(IN) and −V(IN) control voltages and outputs a VCO output signal having an oscillation frequency determined by the +V(IN) and −V(IN) control voltages. The VCO comprises: 1) a storage capacitor charged linearly by a constant charge current and discharged linearly by a constant discharge current; 2) a comparator for comparing the storage capacitor voltage to an upper threshold voltage and a lower threshold voltage. The comparator output drops to a negative saturation voltage (−V(SAT)) when the storage capacitor voltage rises above the upper threshold voltage and rises to a positive saturation voltage (+V(SAT)) when the storage capacitor voltage drops below the lower threshold voltage. The VCO also comprises: 3) a constant charge current source for injecting the constant charge current into the storage capacitor when the comparator output rises to the positive saturation voltage; and 4) a constant discharge current source for draining the constant discharge current from the storage capacitor when the comparator output drops to the negative saturation voltage.
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Passeraub, Philippe A., et al., “A Differential Relaxation Oscillator As A Versatile Electronic Interface For Sensors,” Sensors and Actuators, Elsevier Sequoia S.A., Lausanne vol. 58 No. 2 Feb. 28, 1997 pp. 141-148 XP004122770.
Gregorian, R., et al.; “Analog MOS Integrated Circuits for Signal Processing”; Wiley-Interscience Publication, pp. 448-451.
Choe Henry
Munck William A.
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