US 6,982,538 B2
Methods and apparatus for generating a sinusoidal motor drive signal for a MEMS gyroscope
Stanley A. White, San Clemente, Calif. (US)
Assigned to Honeywell International Inc., Morristown, N.J. (US)
Filed on Sep. 06, 2002, as Appl. No. 10/236,418.
Prior Publication US 2004/0046520 A1, Mar. 11, 2004
Int. Cl. H02P 1/46 (2006.01)
U.S. Cl. 318—702 26 Claims
OG exemplary drawing
 
1. An apparatus to reduce a time delay and a resultant phase shift in a gyroscope motor drive signal, the motor drive signal originating from a numerically controlled oscillator having an output, the oscillator output being sampled at a predetermined rate, said apparatus comprising:
a first element which upsamples the oscillator output samples;
a band pass filter configured to receive an output from said first element and remove spectral components of the output of said first element;
a third element which generates a tuning parameter, β′o, to tune said band pass filter, and
a scaling multiplier configured to normalize an output of said filter.