设计了一款基于相位失配的高线性度Doherty功率放大器(DPA),通过调节输出和输入相位失配网络,改善DPA的幅度-相位(AM-PM)特性并兼顾回退和饱和性能,并基于0.25μm Ga N HEMT工艺,设计了一款全集成DPA来验证上述方法。实测结果显示,在6.3...设计了一款基于相位失配的高线性度Doherty功率放大器(DPA),通过调节输出和输入相位失配网络,改善DPA的幅度-相位(AM-PM)特性并兼顾回退和饱和性能,并基于0.25μm Ga N HEMT工艺,设计了一款全集成DPA来验证上述方法。实测结果显示,在6.3 GHz处,AM-PM<2°,AM-AM<0.3 d B,饱和功率为41.1 d Bm,6 d B回退漏极效率为45%,使用峰均比(PAPR)为7.8 d B的100 MHz调制信号,在33 d Bm处,邻信道功率泄漏比(ACPR)<-43.6 d Bc。展开更多
A 1.1 - 1.2GHz CMOS high phase accuracy,low amplitude mismatch quadrature LO driver is presented,which consists of a high frequency amplifier,an integrated poly phase filter, and an I/Q phase and magnitude calibration...A 1.1 - 1.2GHz CMOS high phase accuracy,low amplitude mismatch quadrature LO driver is presented,which consists of a high frequency amplifier,an integrated poly phase filter, and an I/Q phase and magnitude calibration circuit（PMCC）. The proposed PMCC uses a feed-forward calibration technique. It improves the phase accuracy and reduces the amplitude mismatch with low power consumption. Simulation results show that phase error with PMCC is reduced to about one half and the amplitude mismatch is reduced to about one tenth, when compared to the LO driver without PMCC. Moreover,the calibration circuit also functions as a buffer to drive mixers, thus no additional buffer is needed in this design. The LO driver is implemented in a TSMC 0.25μm CMOS process. Experimental results show that the LO driver achieves high quadrature accuracy （〈2°） and low amplitude mismatch （0. 1%）. It has about 5.25dB gain and dissipates 6mA from the 2.5V power supply. The size of the die area is only 1.0mm×1.0mm.展开更多
A dual-band bandpass microwave photonic filter(MPF) based on stimulated Brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to ge...A dual-band bandpass microwave photonic filter(MPF) based on stimulated Brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to generate two passbands by implementing phase modulation to amplitude modulation conversion by using SBS induced sideband amplification. The center frequencies of both passbands can be independently tuned ranging from 1 GHz to 19 GHz. High resolution with 3 d B bandwidth less than 30 MHz and large out-of-band rejection about 40 d B under 25 m W optical pump power are achieved.展开更多
文摘设计了一款基于相位失配的高线性度Doherty功率放大器(DPA),通过调节输出和输入相位失配网络,改善DPA的幅度-相位(AM-PM)特性并兼顾回退和饱和性能,并基于0.25μm Ga N HEMT工艺,设计了一款全集成DPA来验证上述方法。实测结果显示,在6.3 GHz处,AM-PM<2°,AM-AM<0.3 d B,饱和功率为41.1 d Bm,6 d B回退漏极效率为45%,使用峰均比(PAPR)为7.8 d B的100 MHz调制信号,在33 d Bm处,邻信道功率泄漏比(ACPR)<-43.6 d Bc。
文摘A 1.1 - 1.2GHz CMOS high phase accuracy,low amplitude mismatch quadrature LO driver is presented,which consists of a high frequency amplifier,an integrated poly phase filter, and an I/Q phase and magnitude calibration circuit（PMCC）. The proposed PMCC uses a feed-forward calibration technique. It improves the phase accuracy and reduces the amplitude mismatch with low power consumption. Simulation results show that phase error with PMCC is reduced to about one half and the amplitude mismatch is reduced to about one tenth, when compared to the LO driver without PMCC. Moreover,the calibration circuit also functions as a buffer to drive mixers, thus no additional buffer is needed in this design. The LO driver is implemented in a TSMC 0.25μm CMOS process. Experimental results show that the LO driver achieves high quadrature accuracy （〈2°） and low amplitude mismatch （0. 1%）. It has about 5.25dB gain and dissipates 6mA from the 2.5V power supply. The size of the die area is only 1.0mm×1.0mm.
基金supported by the Science and Technology Development Plan of Jilin Province(Nos.20150204003GX and 20160519010JH)the Science and Technology Plan of Changchun(No.14KG019)
文摘A dual-band bandpass microwave photonic filter(MPF) based on stimulated Brillouin scattering(SBS) is theoretically analyzed and experimentally demonstrated. Two separated tunable laser sources(TLSs) are employed to generate two passbands by implementing phase modulation to amplitude modulation conversion by using SBS induced sideband amplification. The center frequencies of both passbands can be independently tuned ranging from 1 GHz to 19 GHz. High resolution with 3 d B bandwidth less than 30 MHz and large out-of-band rejection about 40 d B under 25 m W optical pump power are achieved.
