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Apparatus for mobile communication systemRelated Patent Categories: Telecommunications, Transmitter, Power Control, Power Supply, Or Bias Voltage SupplyApparatus for mobile communication system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060293001, Apparatus for mobile communication system. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCES TO RELATED APPLICATIONS [0001] This is a continuation application of U.S. Ser. No. 10/372,950, filed Feb. 26, 2003. [0002] The following applications, including this one, are being filed concurrently, and the disclosure of the other applications are incorporated by reference into this application in their entirely for all purposes: [0003] U.K. Patent Application No. 0212737.1 (filed on May 31, 2002) entitled "APPARATUS FOR RADIO TELECOMMUNICATION SYSTEM AND METHOD OF BUILDING UP OUTPUT POWER" [0004] U.K. Patent Application No. 0212725.6 (filed on May 31, 2002) entitled "A COMMUNICATION SEMICONDUCTOR INTEGRATED CIRCUIT, A WIRELESS COMMUNICATION APPARATUS, AND A LOOP GAIN CALIBRATION METHOD" [0005] U.K. Patent Application No. 0212729.8 (filed on May 31, 2002) entitled "TRANSMITTER AND SEMICONDUCTOR INTEGRATED CIRCUIT FOR COMMUNICATION" [0006] U.K. Patent Application No. 0212723.1 (filed on May 31, 2002) entitled "SEMICONDUCTOR INTEGRATED CIRCUIT FOR COMMUNICATION, RADIO-COMMUNICATIONS, APPARATUS, AND TRANSMISSION STARTING METHOD" [0007] U.K. Patent Application No. 0212735.5 (filed on May 31, 2002) entitled "SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE FOR COMMUNICATION" [0008] U.K. Patent Application No. 0212732.2 (filed on May 31, 2002) entitled "APPARATUS FOR MOBILE COMMUNICATION SYSTEM" TECHNICAL FIELD OF THE INVENTION [0009] The present invention relates to a technique effectively applied to an apparatus for mobile communication system such as a mobile phone in which a power-amplifier (hereinafter, referred to as PA) is built. More particularly, the present invention relates to a technique effectively used in an apparatus for mobile communication system capable of supplying a voltage corresponding to a characteristic variation of a PA. BACKGROUND OF THE INVENTION [0010] According to the examinations made by the inventors of the present invention, with respect to the apparatus for mobile communication system such as a mobile phone, the following techniques are known. [0011] For example, in a mobile phone, a PA in which a semiconductor amplifier device such as a MOSFET or a GaAs-MESFET is used in an output section of the transmission side is built in addition to a base band LSI (hereinafter, referred to as BBLSI) as a control circuit device having a function to control the transmitting and receiving of signal and a radio frequency IC (hereinafter, referred to as RFIC) as a radio frequency circuit. The PA amplifies up to the required output voltage for communications and then outputs the output voltage. SUMMARY OF THE INVENTION [0012] With respect to the mobile phone as described above, in the RFIC compatible with EDGE (Enhanced Data transmitted for GMS Evolution) based on GSM (Global System for Mobile Communication) system, a technique employing a polar loop method has been proposed in which feedback is applied while isolating amplitude modulation (AM) components and phase modulation (PM) components from each other. Therefore, an AM loop including the modulation amplitude components using the PA is constructed and the linearity is required for the PA characteristic. [0013] However, in the case where a mobile phone is constructed by the use of the conventional technique, the RFIC compatible with the EDGE employing the polar loop method causes the increase of the load on the PA characteristic. More specifically, it becomes necessary to select a PA corresponding to each RFIC when constructing various specifications of mobile phones. And in this case, there occurs a problem that no PAs can be available except the specific PAs having no characteristic variation. [0014] In such a circumstance, while placing a particular focus on the characteristic variation of the PA, the inventors of this invention have conceived to use the compensation of the characteristic variation of the PA with an aim to be suited to the RFIC compatible with EDGE. For its achievement, while focusing on the bias voltage at the time of the amplitude modulation as a factor to determine the characteristic of the PA, the inventors have found out the method of setting the bias voltage depending on the characteristic of the PA so that the target output power can be achieved. [0015] Considering the foregoing, an object of the present invention is to provide 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 the PA even in a case where the PA having characteristic variation is used. [0016] The above and other objects and novel characteristics of the present invention will be apparent from the descriptions and the accompanying drawings of this specification. [0017] The advantages achieved by the typical ones of the inventions disclosed in this application will be briefly described as follows. [0018] More specifically, the present invention is applied to an apparatus for mobile communication system such as a mobile phone performing data transmission of EDGE system including the amplitude modulation, wherein the apparatus for mobile communication system is provided with a BBLSI for controlling the transmitting and receiving of signal, an RFIC for modulating and demodulating the transmitting and receiving signals, and a PA for amplifying up to the target output power by means of the amplitude modulation at the time of the transmitting. Also, the present invention has characteristics as follows. [0019] (1) Provided is a controllable voltage source (e.g., a register and a DAC (Digital to Analog Converter)), which can optionally set the bias voltage or the power supply voltage corresponding to the characteristic variation of the PA so that the target output power can be achieved at the time of amplitude modulation in the PA. Thus, an apparatus for mobile communication system can be constructed by setting the bias voltage or the power supply voltage corresponding to the characteristic variation of the PA even when the PA having characteristic variation is used. [0020] (2) A system configuration is accomplished, in which the connection between the PA and the BBLSI or the RFIC for setting the bias voltage or the power supply voltage is made by means of one pin. Thus, the connection between the PA and the BBLSI or the RFIC by means of the one pin makes it possible to supply the bias voltage or the power supply voltage. Continue reading about Apparatus for mobile communication system... Full patent description for Apparatus for mobile communication system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Apparatus for mobile communication system patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Apparatus for mobile communication system or other areas of interest. ### Previous Patent Application: Systems and methods of rf power transmission, modulation, and amplification, including a direct cartesian 2-branch embodiment Next Patent Application: High-efficiency modulating rf amplifier Industry Class: Telecommunications ### FreshPatents.com Support Thank you for viewing the Apparatus for mobile communication system patent info. 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