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    • 54. 发明公开
    • MULTI-MODE AND MULTI-BAND TRANSMITTERS FOR WIRELESS COMMUNICATION
    • MULTIMODUS- UND MEHRBAND-SENDERFÜRDIE DRAHTLOSE KOMMUNIKATION
    • EP2204026A1
    • 2010-07-07
    • EP08832286.2
    • 2008-09-19
    • QUALCOMM Incorporated
    • SEE, Puay Hoe AndrewSAHOTA, Gurkanwal SinghSUN, BoBALLANTYNE, Gary, JohnPANTON, William, RonaldCHOI, Zae Yong
    • H04L27/00H04L27/36H04B1/00
    • H04L27/0008H03C3/0916H03C3/0975H03C5/00H03F1/3241H03F1/3252H04B1/0483H04B2001/0425H04L27/361H04L27/362
    • Transmitters supporting multiple modulation modes and/or multiple frequency bands are described. A transmitter may perform large signal polar modulation, small signal polar modulation, and/or quadrature modulation, which may support different modulation schemes and systems. Circuit blocks may be shared by the different modulation modes to reduce cost and power. For example, a single modulator (160) and a single power amplifier (170) may be used for small signal polar modulation and quadrature modulation. The transmitter may apply pre-distortion (124,142) to improve performance, to allow a power amplifier to support multiple frequency bands, to allow the power amplifier to operate at higher output power levels, etc. Envelope and phase distortions due to non-linearity of the power amplifier may be characterized for different input levels and different bands and stored at the transmitter. Thereafter, envelope and phase signals may be pre-distorted based on the stored characterizations to compensate for non-linearity of the power amplifier.
    • 描述支持多个调制模式和/或多个频带的发射机。 发射机可以执行大信号极性调制,小信号极性调制和/或正交调制,其可以支持不同的调制方案和系统。 电路块可以由不同的调制模式共享以降低成本和功率。 例如,单个调制器和单个功率放大器可用于小信号极性调制和正交调制。 发射机可以应用预失真来提高性能,以允许功率放大器支持多个频带,以允许功率放大器在较高的输出功率电平下工作等。由功率放大器的非线性引起的包络和相位失真 可以表征为不同的输入电平和不同的频带并存储在发射机。 此后,基于所存储的特征来包络和相位信号可以被预失真以补偿功率放大器的非线性。
    • 55. 发明公开
    • MIXER WITH HIGH OUTPUT POWER ACCURACY AND LOW LOCAL OSCILLATOR LEAKAGE
    • 麻省理查德·霍霍尔·奥斯丁·斯托克斯
    • EP2198514A1
    • 2010-06-23
    • EP08830370.6
    • 2008-09-12
    • QUALCOMM Incorporated
    • ANIRUDDHAN, SankaranSUN, BoJAYARAMAN, ArunSAHOTA, Gurkanwal, Singh
    • H03D7/16H04B1/04
    • H03D7/165H04B1/0483H04B2001/0416H04B2001/0491
    • A circuit receives a first signal (for example, a baseband signal) and mixes it with a local oscillator (LO) signal, and outputs a second signal (for example, an RFOUT signal). The circuit includes multiple identical Mixer and Frequency Divider Pair (MFDP) circuits. Each MFDP can be enabled separately. Each MFDP includes a mixer and a frequency divider that provides the mixer with a local version of the LO signal. The MFDP outputs are coupled together so that the output power of the second signal (RFOUT) is the combined output powers of the various MFDPs. By controlling the number of enabled MFDPs, the output power of the second signal is controlled. Because the MFDPs all have identical layouts, accuracy of output power step size is improved. Because LO signal power within the circuit automatically changes in proportion to the number of enabled MFDPs, local oscillator leakage problems are avoided.
    • 电路接收第一信号(例如,基带信号)并将其与本地振荡器(LO)信号混合,并输出第二信号(例如,RFOUT信号)。 该电路包括多个相同的混频器和分频器对(MFDP)电路。 每个MFDP可以单独启用。 每个MFDP包括混频器和分频器,为混频器提供本地版本的LO信号。 MFDP输出耦合在一起,使得第二信号(RFOUT)的输出功率是各种MFDP的组合输出功率。 通过控制使能的MFDP的数量,可以控制第二信号的输出功率。 由于MFDP都具有相同的布局,因此输出功率步长的精度提高。 由于电路内的LO信号功率与启用的MFDP数量成比例地自动变化,因此避免了本地振荡器泄漏问题。