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- Cimbili, Bharath, et al.
(författare)
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Investigating Feeding Techniques for High-power and High-efficiency E-band Power Amplifiers
- 2024
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Ingår i: 2024 IEEE TOPICAL CONFERENCE ON RF/MICROWAVE POWER AMPLIFIERS FOR RADIO AND WIRELESS APPLICATIONS, PAWR. - 2164-8751. - 9798350314649 ; , s. 59-61
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Konferensbidrag (refereegranskat)abstract
- In this article, the feeding techniques for highpower and high-efficiency E-band (60 - 90 GHz) power amplifiers (PAs) that employ high-electron-mobility transistors (HEMTs) with a gate periphery of 8x45 mu m are investigated. To enhance the performance of the HEMTs with extended periphery, a symmetrical gate feeder and a low-impedance drain feeder line are proposed for the input and output matching networks, respectively. A wideband three stage PA is demonstrated with an 8x45 mu m HEMT at the final stage, utilizing IAF GaN 100nm technology. The measured PA delivers an output power of 28.7dBm associated with a power-added-efficiency (PAE) of 25.4% at 76 GHz while maintaining a PAE above 20% from 70 to 80 GHz. Moreover, the PA exhibits a small-signal gain of more than 19.5 dB within the 49-79GHz range, featuring a 3-dB bandwidth of 30 GHz. To the best of the authors' knowledge, this is the first PA to demonstrate PAE exceeding 20% and covering the majority (70 - 80 GHz) of the Satcom E-band.
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2. |
- Strömbeck, Frida, 1990, et al.
(författare)
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Transmitter and Receiver Circuits for a High-Speed Polymer Fiber-Based PAM-4 Communication Link
- 2022
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Ingår i: Sensors. - : MDPI AG. - 1424-8220. ; 22:17
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Tidskriftsartikel (refereegranskat)abstract
- A high data rate RF-DAC and a power detector (PD) are designed and fabricated in a 250 nm indium phosphide (InP) double heterojunction bipolar transistor (DHBT) technology. A communication link using the Tx-Rx over polymer microwave fiber (PMF) is measured. The link consists of a pulse amplitude modulation (PAM) modulator and a PD as a demodulator, as well as a one-meter-long dielectric waveguide. The working frequency range of the complete link is verified to be 110–150 GHz. The peak output power of the PAM modulator is 5 dBm, and it has a −3 dB bandwidth of 43 GHz. The PD consists of a parallel connected common emitter configured transistor and a common base configured transistor to suppress the odd-order harmonics at the PD’s output, as well as a stacked transistor to amplify the output signal. Tx and Rx chips, including pads, occupy a total area of only 0.83 mm2. The PMF link can support a PAM-4 signal with 22 Gbps data transmission, and a PAM-2 signal with 30 Gbps data transmission, with a bit error rate (BER) of <10−12, with demodulation performed in real time. Furthermore, the energy efficiency for the link (Tx + Rx) is 4.1 pJ/bit, using digital data input and receiving PAM-2 output (5.6 pJ/bit for PAM-4).
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