Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2011-04-19
2011-04-19
Mai, Tan V (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
07930334
ABSTRACT:
Proportional, integral and derivative error gains within a proportional-integral-derivative filter are selected based on a magnitude of the error value and with successively higher gain values corresponding to larger ranges of error values. Coding of the error gains is selected based on one or more of: large code-dynamic-range to achieve good transient and quiescent responses; small code-step ratio to achieve smooth transitions between consecutive steps; large gain control range to satisfy the differing gain coverage requirements of the three proportional, integral and derivative error; positive and negative code symmetry with small step increment about zero; reservation of code space for dead band elimination; allocation of code space to prevent overflow/underflow during multiplying and bit-shifting; and minimum cost and power.
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Mai Tan V
National Semiconductor Corporation
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