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US 6,617,895 B2Granted
Method and device for symmetrical slew rate calibration
AssigneeIntel Corporation
InventorsJohn F. Zumkehr, James E. Chandler
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Abstract
A device and method for calibrating a slew rate is disclosed. The slew rate may be for a driver of a bi-directional buffer. A driver outputs a signal having a frequency. A receiver is coupled to the driver. A frequency counter measures the frequency of the signal. A calibrated slew rate is determined by the frequency of a waveform of the signal. Different waveforms may be determined for the pull-up and pull-down calibrations.
Claims9
A slew rate calibration device, comprising:
- a driver that acts as an oscillator having a frequency;
- a receiver coupled to said driver;
- a frequency counter to measure said frequency;
- and
- a slew rate calibration control coupled to said driver and said frequency counter, said slew rate calibration control to calibrate slew rate in a signal output by said driver in low-to-high and high-to-low transition phases.
2 more elements
A calibration device for push-pull drivers on a processor, comprising:
- a driver responsive to a slew rate calibration control;
- a receiver coupled to said driver, said receiver having a delay;
- a frequency counter to measure a frequency of a signal through said driver;
- and
- the slew rate calibration control coupled to said driver and said frequency counter, said slew rate calibration control to determine a slew rate calibration for an output signal by said driver in low-to-high and high-to-low transition phases in accordance with said delays and a look up table that to store calibrated slew rates correlate to said frequency.
2 more elements
Dependencies are inferred from the claim text.