Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1995-11-22
1998-04-28
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455575, 455127, 330136, 330310, H04B 140
Patent
active
057458570
ABSTRACT:
An analog/digital dual-mode power amplifier which provides a good linearity and a high efficiency comprises a first and a second power field effect transistors, and an input stage, a middle stage and an output stage. An input stage receives the input signal through an input terminal. A middle stage applies a second gate bias voltage appropriately controlled in response to an analog operating mode or a digital operating mode to a second power FET. An output stage provides matching at center frequency and has the impedance of less than 2.OMEGA. for a second harmonic and a third harmonic. Accordingly, a good linearity and high efficiency circuit can be obtained.
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Tateoka et al; 1994 IEEE MIT-S Digest; A GaAs MCM Power Amplifier of 3.6V Operation with High Efficiency of 49% for 0.9GHz Digital Cell Phone Systems.
Lee Chang-Seok
Maeng Sung-Jae
Park Hyung-Moo
Eisenzopf Reinhard J.
Electronics and Telecommunications Research Institute
Le Thanh
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