Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2010-02-09
2011-10-11
Luu, An (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S116000, C327S159000
Reexamination Certificate
active
08035430
ABSTRACT:
Systems and methods for design and operation of signal generator circuitry with output frequencies greater than the oscillator frequency. Accordingly, in a first method embodiment, a method of producing an output periodic electronic signal comprises accessing four signals having a quadrature phase relationship. First and second pairs of these signals having a one half cycle phase relationship are averaged to produce two signals having an improved duty cycle and a one-quarter cycle phase relationship. The first and second averaged periodic electronic signals are combined in an exclusive OR circuit to produce the output periodic electronic signal at twice the oscillator frequency. Advantageously, the periodic signal may comprise a desirable duty cycle of 50 percent.
REFERENCES:
patent: 5864246 (1999-01-01), Anderson
patent: 6798299 (2004-09-01), Mar et al.
patent: 6885523 (2005-04-01), Summers et al.
patent: 7420870 (2008-09-01), Park et al.
patent: 2007/0001771 (2007-01-01), Hori et al.
Rozas Guillermo J.
Schnaitter William N.
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