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首页> 外文期刊>International Journal of Microwave and Wireless Technologies >0.7-1.8 GHz multiband digital polar transmitter using watt-class current-mode dass-D CMOS power amplifier and digital envelope modulation technique for reduced spurious emissions
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0.7-1.8 GHz multiband digital polar transmitter using watt-class current-mode dass-D CMOS power amplifier and digital envelope modulation technique for reduced spurious emissions

机译:采用瓦特级电流模式dass-D CMOS功率放大器和数字包络调制技术的0.7-1.8 GHz多频带数字极性发射机,可减少杂散发射

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摘要

A polar transmitter driven by digital input signals for envelope and phase is demonstrated, using a band-switching output resonator to achieve multiband operation. A new digital pulse width modulation algorithm is also shown to partially suppress spurious signals associated with the digital input envelope signal. The transmitter consists of a current-mode class-D (CMCD) CMOS power amplifier (PA), together with a buck converter with a dead-time generator for improved efficiency. The CMCD PA is tuned by band-switching capacitors that can handle up to 9 V, and is measured to have approximately 30 dBm output power with 31-35% drain efficiency under single-tone testing. The proposed spurious signal reduction technique works to partially suppress quantization noise without increasing power consumption. Overall efficiencies of 27.1/25.6% are obtained at 30.2/28.9 dBm continuous wave (CW) output powers ando.85/1.75 GHz carrier frequencies, respectively. Spur suppression of 9-10 dB peak is achieved when the proposed algorithm is applied with wideband code division multiple access (WCDMA) modulation.
机译:演示了一种极性发送器,该信号由用于包络和相位的数字输入信号驱动,使用频带切换输出谐振器来实现多频带操作。还显示了一种新的数字脉冲宽度调制算法,可以部分抑制与数字输入包络信号相关的杂散信号。该发送器包括电流模式D类(CMCD)CMOS功率放大器(PA),以及具有死区时间发生器的降压转换器,以提高效率。 CMCD PA通过可处理高达9 V的频带开关电容器进行调谐,在单音测试下测得的输出功率约为30 dBm,漏极效率为31-35%。所提出的杂散信号减少技术可在不增加功耗的情况下部分抑制量化噪声。在30.2 / 28.9 dBm连续波(CW)输出功率和o.85 / 1.75 GHz载波频率下,总效率分别为27.1 / 25.6%。当所提出的算法与宽带码分多址(WCDMA)调制一起应用时,可实现9-10 dB峰值的杂散抑制。

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