Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2011-06-28
2011-06-28
LeDynh, Bot L (Department: 2858)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C324S105000
Reexamination Certificate
active
07969151
ABSTRACT:
A pre-amplifier circuit for connection to an antenna of a human-portable locator includes a differential amplifier/mixer pair and means for allowing a common-mode “phantom” signal to modulate a transfer function of the differential amplifier/mixer pair. The common-mode phantom signal modulates the transfer function of the differential pre-amplifier “onboard” the antenna without the usual requirement for onboard power supply and signal oscillator. This technique uses the same electronic components to provide both pre-amplification and mixing functions, thereby improving circuit performance-to-cost ratio, reducing mixer power consumption, situating the necessary signal oscillator remotely from the mixer, and greatly improving the available system bandwidth by limiting spectral transmission demands to the mixed signal bandwidth alone.
REFERENCES:
patent: 4786862 (1988-11-01), Sieron
patent: 5757181 (1998-05-01), Wolf et al.
patent: 6531860 (2003-03-01), Zhou et al.
Ledynh Bot L
SeekTech, Inc.
Tietsworth, Esq. Steven C.
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