Wireless communication apparatus

Details Wireless communication apparatus Wireless communication apparatus

2007-02-27

2007-02-27

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S298000, C332S103000, C332S107000, C330S010000

Reexamination Certificate

active

10655045

ABSTRACT:
A linear system and an EER system are used in combination such that the EER system can also be used in a cellular phone with a wide output dynamic range. In the EER system, linear control of an amplifier becomes difficult in a low output range. Thus, use of the EER system is limited to a high output range, and the linear system is used in the low output range as in the past. A power efficiency is improved while requirements of linearity are satisfied by this structure. An effective circuit structure is proposed for a switching control system for two systems. In addition, an up-converter is constituted in combination with a step-down element with high responsiveness, whereby a power supply voltage control circuit for the EER system with a wide control range and high responsiveness is provided.

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