Patent
Harmonic suppression in dual band mobile phones
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TLDR
In this paper, a power amplifier output circuit in which harmonics are filtered through impedance transformation of a turn-off impedance of a transmitter/receiver change over unit is described.Abstract:
To effectively suppress harmonics in a dual band mobile phone with a power amplifier (10) outputting transmitting signals for different frequency bands (GSM; PCS, DCS) via a single output as described a power amplifier output circuit in which harmonics are filtered through impedance transformation of a turn-off impedance of a transmitter/receiver change over unit (36, 38). Hereby the desired filtering of harmonics may be achieved without almost no additional expenditure.read more
Citations
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References
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Patent
Antenna switching circuits for radio telephones
Jorma Matero,Matti I. Kangas +1 more
TL;DR: In this paper, the first and second transceivers of a dual-band radio telephone are coupled to integral and external antennas to provide a minimum insertion loss, using impedance matching lengths of transmission lines and switches.
PatentDOI
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TL;DR: An apparatus for conveying to a listener a pseudo low frequency psycho-acoustic sensation (Pseudo-LFPS) of a sound signal, including: frequency unit capable of deriving from the sound signal high frequency signal and low frequency signal (LF signal) that extends over a low frequency range of interest as discussed by the authors.
Patent
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