Back to results
US 2008/0303601 A1Published application
Reference oscillator and its use
AssigneeNemerix SA
InventorPhil YOUNG
Life of this patent
Estimating the term…
Abstract
A reference clock circuit (170), has a low-power mode, in which the frequency consumption is reduced, and including an internal counter, accumulating time spent in low-power mode. The circuit includes a crystal resonator (60), an oscillator circuit (70), and a temperature compensation circuit (80), providing a stable clock output (85). During low-power mode temperature compensation can be switched off. The circuit further provides a wakeup signal (107) after a preset time in low-power mode.
Claims16
A reference oscillator circuit, including:
- a crystal resonator, having a resonance frequency;
- an oscillator arranged to maintain the resonator in oscillation at the resonance frequency, and generate an oscillating signal at the resonance frequency,
- a temperature compensation circuit, providing a temperature-compensated clock output signal,
- wherein the reference circuit has at least one normal operational state and a low-power state, wherein the power consumption of the reference circuit in the low-power state is lower than the power consumption of the reference circuit in the normal state, and a command input, arranged to change the state of the reference circuit according to the value present at the command input,
- characterized by:
- a counter, externally accessible by a counter output interface, arranged to count a signal derived from said oscillator, while the reference circuit is in low-power state.
3 more elements
Dependencies are inferred from the claim text.