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US 8,618,887 B2Granted
Configurable spread spectrum oscillator
AssigneeHamilton Sundstrand Corporation
InventorJohn A. Dickey
Life of this patent
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Abstract
A spread spectrum oscillator includes a high frequency oscillator circuit configured to oscillate at a first frequency, and a low frequency oscillator circuit configured to oscillate at a second frequency and resistively coupled to a current summing node of the high frequency oscillator circuit. The first frequency is higher than the second frequency.
Claims12
A spread spectrum oscillator, comprising:
- a first frequency oscillator circuit configured to oscillate at a first frequency, the first frequency oscillator including:
- a first resistance;
- a first Schmitt trigger inverter in parallel communication with the first resistance;
- and
- a first capacitor actively coupling the first resistance and first Schmitt trigger inverter to ground;
- a second frequency oscillator circuit configured to oscillate at a second frequency and resistively coupled to a current summing node of the first frequency oscillator circuit, wherein the first frequency is higher than the second frequency;
- and
- a capacitive voltage division network arranged in communication with the high frequency oscillator circuit, wherein the capacitive voltage division network is configured to stabilize hysteresis in the first Schmitt trigger inverter.
5 more elements
A spread spectrum oscillator, comprising:
- a first frequency oscillator circuit configured to oscillate at a first frequency, the first frequency oscillator including:
- a first resistance;
- a first Schmitt trigger inverter in parallel communication with the first resistance;
- and
- a first capacitor actively coupling the first resistance and first Schmitt trigger inverter to ground;
- a second frequency oscillator circuit configured to oscillate at a second frequency and resistively coupled to a current summing node of the first frequency oscillator circuit, wherein the first frequency is higher than the second frequency, wherein the low frequency oscillator circuit comprises:
- a second resistance;
- a second Schmitt trigger inverter in parallel communication with the second resistance;
- and
- a second capacitor actively coupling the second resistance and second Schmitt trigger inverter to ground;
- and
- a capacitive voltage division network arranged in communication with the second frequency oscillator circuit, wherein the capacitive voltage division network is configured to stabilize hysteresis in the second Schmitt trigger inverter.
9 more elements
A spread spectrum oscillator, comprising:
- a first frequency oscillator circuit configured to oscillate at a first frequency;
- a second frequency oscillator circuit configured to oscillate at a second frequency and resistively coupled to a current summing node of the first frequency oscillator circuit, wherein the first frequency is higher than the second frequency;
- wherein the first frequency oscillator circuit comprises:
- a first resistance, a first Schmitt trigger inverter in parallel communication with the first resistance, and a first capacitor actively coupling the first resistance and first Schmitt trigger inverter to ground;
- wherein the second frequency oscillator circuit comprises:
- a second resistance, a second Schmitt trigger inverter in parallel communication with the second resistance, and a second capacitor actively coupling the second resistance and second Schmitt trigger inverter to ground;
- and
- a first capacitive voltage division network arranged in communication with the first frequency oscillator circuit, wherein the first capacitive voltage division network is configured to stabilize hysteresis in the first Schmitt trigger inverter;
- and
- a second capacitive voltage division network arranged in communication with the second frequency oscillator circuit, wherein the second capacitive voltage division network is configured to stabilize hysteresis in the second Schmitt trigger inverter.
7 more elements
Dependencies are inferred from the claim text.