Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Patent
1993-03-18
1995-06-06
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
455 93, 455 95, 455102, 455127, 330297, 307110, H04B 140
Patent
active
054230780
ABSTRACT:
The present invention relates generally to RF power amplifiers for portable cellular radiotelephones, and more particularly, to dual-mode cellular radiotelephones. A power supply network enables the RF power amplifier in a dual-mode radiotelephone to operate with two separate modes: saturated and unsaturated. Switches in the power supply network, e.g. complementary transistors, are driven to a first set of logic states by a square wave which is synchronized with transmit time slots present in a TDMA frame structure to charge a capacitor from a battery. When the switches are then driven to a second set of logic states, the capacitor is placed in series with the battery to essentially double the supply voltage. When the radiotelephone operates in a digital mode, the increased supply voltage coincides with the transmit time slot and temporarily increases the saturation point of the RF power amplifier to permit linear amplification. When the radiotelephone operates in an analog mode, the switches are fixed at the first set of logic states. The resulting lower supply voltage lowers the saturation point of the RF power amplifier, causing it to operate in a nonlinear but more efficient mode.
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39th IEEE Vehicular Technology Conference, vol. 1, May 1989.
20th European Microwave Conference 90, vol. 1, Sep. 1990.
Dent Paul W.
Epperson Darrell
Eisenzopf Reinhard J.
Ericsson - GE Mobile Communications Inc.
Vo Nguyen
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