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A Doherty power amplifier (PA) for long term evolution (LTE) applications is fully integrated on a 1.4×1.4 mm2 die using a 2-µm InGaP/GaAs hetero-junction bipolar transistor (HBT) process. The quarter-wavelength transformer is the bandwidth (BW) limit of the Doherty PA. Other bandwidth limiting factors are analyzed and eliminated. A conventional phase compensation circuit and an additional offset...
A two-stage power amplifier (PA) and a supply modulator are designed and implemented for envelope-tracking (ET) operation to reduce dc power consumption. The supply modulator is connected to each stage of the PA and further enhances efficiency in a back-off power region. The envelope of a signal is reshaped to achieve good linearity and efficiency. The ET PA performs a power-added efficiency (PAE)...
A two-stage power amplifier (PA) and a supply modulator are designed and implemented for envelope-tracking (ET) operation to reduce dc power consumption. The supply modulator is connected to each stage of the PA and further enhances efficiency in a back-off power region. The envelope of a signal is reshaped to achieve good linearity and efficiency. The ET PA performs a power-added efficiency (PAE)...
The Doherty power amplifier for mobile WiMAX application is fully integrated in 1.2×1.2 mm2 using a 2-μm InGaP/GaAs HBT process. The direct input power dividing technique is employed on a chip. Broadband input and output matching techniques are used for broadband Doherty operation. A 1.5 times larger peaking amplifier than carrier amplifier is used to have high efficiency for IEEE 802.16e m-WiMAX...
A Doherty power amplifier for IEEE 802.16e mobile worldwide interoperability for microwave access (m-WiMAX) is fully integrated on a 1.2 × 1.2 × mm2 die using a 2-μm InGaP/GaAs hetero-junction bipolar transistor (HBT) process. The direct input power dividing technique is employed on the chip. Broadband input and output matching techniques are used for broadband Doherty operation, and their effects...
The efficiency and linearity are enhanced by a direct input dividing and an uneven power drive. An optimized envelope tracking (ET) operation of Doherty power amplifier (PA) is presented. The PA and the supply modulator are realized using a 2 μm InGaP/GaAs HBT and 0.13 μm CMOS processes, respectively. For WiMAX application, it shows a PAE of 38.6% and an EVM of 3.64% at an output power of 24.22 dBm...
The input power drive of Doherty power amplifier (PA) is analyzed and a proper input dividing technique without a coupler is introduced. The efficiency and linearity are enhanced by the uneven power drive and proposed output matching circuits. The PA circuit is realized using a 2-mum InGaP/GaAs HBT process and combined using merged lumped-components for Doherty operation. For wireless broadband (WiBro)...
In this paper, a compact quad-band module for Wireless Local Area Network (WLAN) and Worldwide Interoperability for Microwave Access (WiMAX) applications is realized by Low Temperature Co-fired Ceramic (LTCC) technology. The quad-band module is composed of four bandpass filters, and matching networks, which are fully embedded in the LTCC substrate, and two MMIC switches are attached on the substrate...
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