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AssigneesHitachi, Ltd., TTP Com Limited
InventorsKazuhisa Okada, Kazuhiko Hikasa, Patrick Wurm, David Freeborough
Estimating the term…
Disclosed is an apparatus for mobile communication system capable of constructing a system such as a mobile phone by setting a voltage corresponding to the characteristic variation of a PA even when a PA having characteristic variation is used. The mobile phone is the one employing the polar loop method, which comprises an antenna (1) for transmission and reception of signal waves; an antenna switch (2) for switching the transmission mode and the reception mode; a BBLSI (3) having a function to control the transmission and reception; an RFIC (4) having a function for modulating and demodulating the transmitted and received signals; and a PA (5) for amplifying up to the target output power by means of the amplitude modulation at the time of the transmission, wherein a bias voltage corresponding to the characteristic variation of the PA is set and supplied by a BIASDAC (6) formed of a register and a DAC so as to achieve the target output power at the time of the amplitude modulation in the PA.
Apparatus for mobile communication system, which performs data transmission of EDGE system including an amplitude modulation and has a control circuit to control transmitting and receiving of signals, a radio frequency circuit for modulating a transmitting signal and demodulating a receiving signal, and a power amplifier for amplifying a transmitting signal to a target output power by amplitude modulation when said apparatus is in transmitting, said apparatus for mobile communication system comprising:
Dependencies are inferred from the claim text.