Method and apparatus for measuring the rotational speed of a...

Details Method and apparatus for measuring the rotational speed of a... Method and apparatus for measuring the rotational speed of a...

2006-08-22

2006-08-22

Raymond, Edward (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C700S001000

Reexamination Certificate

active

07096134

ABSTRACT:
A system may include a PWM (Pulse Width Modulator) configured to generate a PWM signal, a signal modifier configured to generate a modified PWM signal that includes a sampling activation signal having a different frequency than the PWM signal, fan drive circuitry configured to provide power to a fan in response to the modified PWM signal; and a sampling unit configured to sample a fan tachometer signal in response to an indication that the fan is currently powered.

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Marando et al., U.S. Appl. No. 10/459,169 entitled “Programmable PWM Stretching for Tachometer Measurement”, filed on Jun. 11, 2003.
Analog Devices, Publication ADM1027, “dBCOOL™ Remote Thermal Controller and Voltage Monitor,” 2003, 56 pages.
National Semiconductor Corporation, Publication LM63, “±1° C Accurate Remote Diode Digital Temperature Sensor with Integrated Fan Control,” Feb. 2003, 28 pages.
Stephen Ohr, “Analog IC vendors fing ‘Intel Inside’ a safe bet,” Sep. 12, 2002, online at http://www.eetimes.com/story/OEG20020912S0026.

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