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US 10,312,891 B1Granted
Variation tracking and compensating for small capacitor
AssigneeQUALCOMM Incorporated
InventorsChao Song, Zhengzheng Wu, Haitao Cheng, Ye Lu
Life of this patent
Estimating the term…
Abstract
In certain aspects, an integrated circuit comprises a signal path having a path delay from an input to an output, wherein the signal path comprises a path capacitor having a path capacitance. The integrated circuit also comprises a variation tracking circuit coupled to the signal path, wherein the variation tracking circuit comprises a tracking resistor have a tracking resistance, and wherein a product of the tracking resistance and the path capacitance is substantially constant over process variation.
Claims25
An integrated circuit, comprising:
- a signal path having a path delay from an input to an output, wherein the signal path comprises a path capacitor having a path capacitance;
- and
- a variation tracking circuit coupled to the signal path, wherein the variation tracking circuit comprises a tracking resistor having a tracking resistance, and wherein a product of the tracking resistance and the path capacitance is substantially constant over process variation.
A method, comprising:
- delaying a signal from an input to an output through one or more logic gates having a path delay, wherein at least one of the one or more logic gates is loaded with a path capacitor having a path capacitance;
- and
- coupling a variation tracking circuit to the one or more logic gates, wherein the variation tracking circuit comprises a tracking resistor having a tracking resistance, and wherein a product of the tracking resistance and the path capacitance is substantially constant over process variation, and wherein the path delay is substantially constant over process variation.
Dependencies are inferred from the claim text.