Pulse or digital communications – Pulse position – frequency – or spacing modulation
Reexamination Certificate
2005-09-29
2009-11-03
Ghayour, Mohammad H (Department: 2611)
Pulse or digital communications
Pulse position, frequency, or spacing modulation
C375S130000, C375S135000, C375S146000, C375S295000, C375S296000, C375S309000, C375S312000, C375S377000
Reexamination Certificate
active
07613239
ABSTRACT:
A digital signal offset adjusting apparatus has a capacitor causing an output terminal to pass a high frequency band of an input digital signal. A first coil has one end connected to an input terminal and a second coil has one end connected to an output. An operational amplifier has an input connected to another end of the first coil, a second input connected to a direct current voltage generator and an output connected to another end of the second coil. The operational amplifier outputs a signal obtained by subtracting and combining the low frequency band, the direct current component and a direct current bias voltage. A frequency characteristic compensating circuit is connected between a reference point and the second input of the operational amplifier. The gain of the operational amplifier increases with a component having a higher frequency from among low frequency bands of the input digital signal.
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International Preliminary Report on Patentability, Chapter I of the Patent Cooperation Treaty, and Written Opinion of the International Searching Authority, dated Apr. 12, 2007, for PCT/JP2005/018006, 5 sheets.
Fujinuma Kazuhiro
Saito Sumio
Shiratsuchi Satoru
Anritsu Corporation
Frishauf Holtz Goodman & Chick P.C.
Ghayour Mohammad H
Vlahos Sophia
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