Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Phase shift by less than period of input
Reexamination Certificate
2011-03-29
2011-03-29
Luu, An T (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Phase shift by less than period of input
C327S233000, C327S236000
Reexamination Certificate
active
07915942
ABSTRACT:
A reference signal is split and input to first and second variable phase shifters 10, 20. The first and second variable phase shifters output to first and second inputs 31, 32 respectively of a phase comparator 30. Initially, the first and second variable phase shifters 10, 20 are preferably set to the same phase. The first and second phase shifters are then aligned, e.g. by adjusting the calibration of one or both of the phase shifters so that the phase comparator 30 indicates that they output the same phase. The phase of the first phase shifter 10 is then adjusted by one step and a phase delay section 60 is placed between the output of the second phase shifter 20 and the second input 32 of the phase comparator 30. The first and second phase shifters 10, 20 are then aligned again.
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Wan Kwun Chiu
Xue Quan
City University of Hong Kong
Jackson Douglas E.
Luu An T
Stites & Harbison PLLC
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