High-accuracy dual-mode free running oscillator
AssigneeNXP B.V.
InventorsXu Zhang, Siamak Delshadpour
Life of this patent
Estimating the term…
Abstract
A free running oscillator (FRO) includes a reference current generator, a current converter, and first and second oscillator cores. The reference current generator generates a first current. The current converter generates a second current based on the first current. The first oscillator core generates a clock signal at a first frequency based on a first value of the second current. The second oscillator core generates a clock signal at a second frequency based on a second value of the second current. The second frequency may be lower than the first frequency, and the second value of the second current lower than the first value of the second current.
Claims15
An oscillator, comprising:
- a reference current generator configured to generate a first current;
- a converter configured to generate a second current based on the first current;
- a first oscillator core configured to generate a clock signal at a first frequency;
- and
- a second oscillator core configured to generate a clock signal at a second frequency lower than the first frequency,
- wherein
- the first oscillator core is configured to generate the clock signal of the first frequency based on a first value of the second current and
- the second oscillator core is configured to generate the clock signal of the second frequency based on a second value of the second current,
- the second value lower than the first value.
An oscillator, comprising:
- a reference current generator configured to generate a first current;
- a converter configured to generate a second current based on the first current;
- a first oscillator core configured to generate a clock signal at a first frequency;
- a second oscillator core configured to generate a clock signal at a second frequency lower than the first frequency;
- wherein the first oscillator core is configured to generate the clock signal of the first frequency based on a first value of the second current;
- wherein the second oscillator core is configured to generate the clock signal of the second frequency based on a second value of the second current;
- wherein the second value lower than the first value;
- and
- wherein the reference current generator includes a first current mirror having a scalable mirroring ratio.
An oscillator, comprising:
- a reference current generator configured to generate a first current;
- a converter configured to generate a second current based on the first current;
- a first oscillator core configured to generate a clock signal at a first frequency;
- a second oscillator core configured to generate a clock signal at a second frequency lower than the first frequency;
- wherein the first oscillator core is configured to generate the clock signal of the first frequency based on a first value of the second current;
- wherein the second oscillator core is configured to generate the clock signal of the second frequency based on a second value of the second current;
- wherein the second value lower than the first value;
- wherein the first oscillator core includes a number of first inverters;
- wherein the second oscillator core includes a number of second inverters;
- and
- a width over length ratio of one or more transistors in the number of second inverters is less than a size of one or more transistors in the number of first inverters.
Dependencies are inferred from the claim text.