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公开(公告)号：US20170163271A1
公开(公告)日：2017-06-08
申请号：US15325855
申请日：2015-06-30
发明人： Huagang WU
IPC分类号： H03L7/16
CPC分类号： G06F1/0321 , G06F1/022 , H03L7/16
摘要： A direct digital frequency synthesis method comprises the following steps: calculating, by a phase accumulation module, a first phase according to a frequency synthesis word (S101); finding an amplitude value by a preset sinusoidal lookup table according to the first phase (S102); finding a second phase by a preset phase lookup table according to the amplitude value (S103); if the second phase is less than the first phase, adjusting and outputting the amplitude value (S105); or else, outputting the original amplitude value (S106); and performing, by a digital-to-analog converter, a digital-to-analog conversion according to the output amplitude value to obtain a sinusoidal wave (S107); wherein, for a N-bit phase accumulation module and a D-bit digital-to-analog converter, the preset phase lookup table has 2D−1-1 phase boundary value records corresponding to 0˜2D−1-2 amplitudes, each phase boundary value is stored in N-2 bits. A direct digital frequency synthesizer applying the above method is also disclosed.
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公开(公告)号：US20170131116A1
公开(公告)日：2017-05-11
申请号：US15321958
申请日：2015-06-26
发明人： Huagang WU
CPC分类号： G01C25/00 , G01C19/56 , G01C19/5776
摘要： A method for correcting the driving amplitude of a gyro sensor, mainly comprises adjusting the size of a driving signal (a preset amplitude value) through feedback of a sensor response amplitude signal (an average amplitude value) in a resonance maintaining time period, so that the response amplitude of the resonance maintaining time period tends to be equal, and a stable resonance amplitude is maintained. Also provided is a system for correcting the driving amplitude of a gyro sensor.
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