Telecommunications – Transmitter – Having harmonic radiation suppression
Patent
1998-02-13
2000-02-08
Bost, Dwayne D.
Telecommunications
Transmitter
Having harmonic radiation suppression
455103, 330149, 330151, H04B 104, H03F 126
Patent
active
060236116
ABSTRACT:
The present invention relates to a power amplifier device (10), switchable for at least two separate basic frequency bands, for radio frequency signals with effective suppression of harmonics, where harmonics, corresponding to a first basic frequency band, can be permitted to overlap the frequency range of at least one second basic frequency band. The power amplifier device (10) comprises a power amplifier (1) and an impedance matching circuit (2), switchable by means of a PIN-diode, which provides a load impedance adapted to each individual basic frequency band. Furthermore, the power amplifier device comprises a filter device (3) comprising a fixed low-pass filter (3b) and a switchable filter (3b) acting as an engageable and disengageable notch filter, which comprises at least one reversible PIN-diode. This switchable filter (3a) allows to pass, in a first mode, signals in the first basic frequency band and suppresses at the same time at least one order of harmonics corresponding to this basic frequency band. In a second mode, the second basic frequency band is transmitted without appreciable losses, and harmonics are suppressed by the fixed low-pass filter (3a).
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Bolin Tomas
Brandt Per-Olof
Imberg Ulrik
Bost Dwayne D.
Redmon Joy
Telefonaktiebolaget LM Ericsson
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