Electricity: motive power systems – Positional servo systems – Digital or numerical systems
Reexamination Certificate
2011-01-04
2011-01-04
Benson, Walter (Department: 2837)
Electricity: motive power systems
Positional servo systems
Digital or numerical systems
C318S568150, C318S569000, C318S603000, C318S268000
Reexamination Certificate
active
07863849
ABSTRACT:
A fan driver circuit for powering a fan with a linear voltage may be designed using digital design techniques, resulting in a testable, accurate circuit on a smaller die size. The fan driver circuit may be configured to receive a digital control signal, which may be a sequence of numeric values, e.g. multiple-bit binary numbers, each indicative of a desired present rotational speed of the fan. The fan driver circuit may be implemented using a digital modulator, e.g. a delta-sigma modulator, with a simple low-pass filter, e.g. an RC-filter at the output, and may use oversampling based on a system clock, to shift in-band noise to out-of-band frequencies, and digital interpolation to filter out unwanted images from the upsampled digital control signal. The delta-sigma modulator may be constructed as a first-order delta-sigma modulator using an error-feedback structure to reduce die size.
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McLeod Scott C.
Tsai Chao-Ming
Benson Walter
Dinh Thai
Hood Jeffrey C.
Meyertons Hood Kivlin Kowert & Goetzel P.C.
Standard Microsystems Corporation
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