Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2007-04-26
2008-10-21
Young, Brian (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S123000
Reexamination Certificate
active
07439897
ABSTRACT:
Staggered interleaved Nyquist regions associated with differing ADC clock rates (FCLK) avoids spectrum lost through disjoint guard bands at the end of or between adjacent Nyquist regions. The staggered interleaved Nyquist regions overlap by an amount at least as much as is consumed by the guard bands. Selectable anti-aliasing filters associated with each Nyquist region and its ADC clock rate are used to enforce the staggered Nyquist regions and their various guard bands. For example, and neglecting guard bands, an initial raw band of operation RB1may be the First Nyquist region for a basic sampling frequency Fs. An adjacent raw band of operation RB2that overlaps RB1may be the Second Nyquist region for an alternate sampling frequency 2Fs/3. An adjacent raw band of operation RB3that overlaps RB2may be the Second Nyquist region for the basic sampling frequency Fs. These raw bands interleave and overlap:RB1:DCtoFs/21stNyq. for FCLK= FsRB2:(2/3)Fs−to2(2Fs/3)/2 =2ndNyq. for FCLK= 2Fs/3(1/2)(2/3Fs) = Fs/32Fs/3RB3:Fs− (1/2)Fs= Fs/2to2(Fs/2) = Fs2ndNyq. for FCLK= FsIn this example the smallest overlap is Fs/6. We then select widths for guard bands that do not exceed Fs/6. Additional ADC clock rates and anti-aliasing filters may be used to operate in still higher Nyquist regions.
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Gorin Joseph M.
Poulton Kenneth D.
Agilent Technologie,s Inc.
Young Brian
LandOfFree
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