Pulse or digital communications – Transmitters
Reexamination Certificate
2006-06-06
2006-06-06
Chin, Stephen (Department: 2634)
Pulse or digital communications
Transmitters
C375S222000, C375S242000, C375S260000, C370S442000, C370S225000
Reexamination Certificate
active
07058136
ABSTRACT:
To generate a high-power modulated radio frequency signal SOUTfrom an input low or medium frequency information signal SIN, the information signal is pulse-shaped in a quantifier to form a digital signal SDhaving discrete signal values. The digital signal is processed in a switching unit comprising switches for each signal value, in radio frequency wave generators for each switch generating carrier waves of radio frequency, and in control circuits for each switch to control the opening and closing thereof. When a switch is closed, its associated generator is connected to the output line of the switching unit, and when it is opened, the generator is disconnected therefrom. In the switching unit, a switched radio frequency signal SSWcarrying the information of the input signal is formed by opening and closing the switches when the digital signal adopts or does not adopt, respectively, the signal value associated with the respective switch. The switching is thus controlled by the signal values of the digital signal. The switched signal on the output line of the switching unit is filtered by a filter for achieving the high-power, modulated, radio frequency signal SOUT.
REFERENCES:
patent: 4087751 (1978-05-01), Kato et al.
patent: 5450444 (1995-09-01), Miki et al.
patent: 6094458 (2000-07-01), Hellberg
patent: 0 426 560 (1991-05-01), None
patent: 98/11683 (1998-03-01), None
Dalipi Spendim
Fondén Tony
Hellberg Richard
Chin Stephen
Nixon & Vanderhye P.C.
Telefonakitiebolaget L M Ericsson (publ)
Zheng Eva
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