Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2011-03-08
2011-03-08
Le, Lana N (Department: 2614)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C455S126000, C455S127300
Reexamination Certificate
active
07904038
ABSTRACT:
An output monitor circuit of a radio-frequency circuit outputs a radio-frequency signal of wavelength λ. The circuit includes a directional coupler, a detection circuit, and a back flow blocking circuit. The directional coupler has a coupling line of a length less than λ/4 coupled with an output line of the radio-frequency circuit and a terminating resistor connected to one end on the radio-frequency circuit side of the coupling line. A radio-frequency signal is derived from the other end of the coupling line by means of coupling between the coupling line and the output line. The detection circuit detects a radio-frequency signal derived from the directional coupler to produce a monitor signal. The back flow blocking circuit blocks signal components back flowing from the output side toward the output line in a portion where there is no coupling between the output line and the coupling line.
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Kabushiki Kaisha Toshiba
Le Lana N
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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