Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1994-03-30
1996-06-25
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
With feedback of modulated output signal
455 93, 455127, 330 51, 330295, H04B 104
Patent
active
055309232
ABSTRACT:
A dual mode transmitter circuit is disclosed including a non-linear high-power amplifier having an amplification that can be adjusted and a linear high-power amplifier. A first switch and a second switch are connected to the input and output of the linear, high-power amplifier. An amplification-adjustable, high-frequency transmitter control amplifier is connected to the input of the non-linear high-power amplifier. Apparatus for measuring transmission power such as a directional coupler is connected to the second switch, and a duplex filter is connected to the directional coupler. A power level control circuit is responsive to the measured transmission power from the directional coupler and to a power level signal. The power level signal is representative of the desired output power of the transmitter. The power level control circuit compares the measured power level from the directional coupler with the desired power level and produces a difference signal on its output lead which is connected to both the non-linear high-power amplifier and to the high-frequency transmitter control amplifier. A mode selection signal, for designating either an analog or digital type transmission mode is applied to a mode control circuit that is responsive to the mode selection signal and provides switching signals to the first and second switches and a control signal to the linear amplifier. The mode selection signal sets the transmitter to function in either the non-linear transmission (analog) mode or the linear transmission (digital) mode.
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Heinonen Jarmo
Hulkko Jaakko
Vilmi Toivo
Eisenzopf Reinhard J.
Nokia Mobile Phones Ltd.
Vo Nguyen
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