Telecommunications – Transmitter – Power control – power supply – or bias voltage supply
Reexamination Certificate
2005-08-09
2005-08-09
Vuong, Quochien B. (Department: 2685)
Telecommunications
Transmitter
Power control, power supply, or bias voltage supply
C455S127100, C455S127200, C455S572000, C455S574000
Reexamination Certificate
active
06928273
ABSTRACT:
A level detection circuit detects a signal level of an intermediate frequency signal which is superposed on a DC voltage input from an input terminal and is separately extracted by an input processing circuit, and converts the same into a corresponding DC voltage for output to a transmission output control circuit. The transmission output control circuit compares the DC voltage received from the level detection circuit with a reference voltage and determines whether the intermediate frequency signal is being input. When the transmission output control circuit determines that the intermediate frequency signal is not being input, a switch circuit cuts off the power from a power control circuit to a transmission amplifying circuit. As a result, the radio transmission apparatus can prevent wasteful power consumption and can suppress a noise and a communication error when the transmission of the intermediate frequency signal is not intended.
REFERENCES:
patent: 5199110 (1993-03-01), Adachi
patent: 5566363 (1996-10-01), Senda
patent: 6580901 (2003-06-01), Mochizuki
patent: 6617930 (2003-09-01), Nitta
patent: 6798845 (2004-09-01), Nakajima
patent: 6807403 (2004-10-01), Tanaka
patent: 99/43083 (1999-08-01), None
Birch & Stewart Kolasch & Birch, LLP
Hannon Christian A.
Vuong Quochien B.
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