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Sökning: WFRF:(Lasser C)

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1.
  • 2021
  • swepub:Mat__t
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3.
  • Robinson, Megan C., et al. (författare)
  • Linear broadband interference suppression circuit based on GaN monolithic microwave integrated circuits
  • 2023
  • Ingår i: IET Circuits, Devices and Systems. - 1751-858X .- 1751-8598. ; 17:4, s. 213-224
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents simulation and measurement results of a 2–4 GHz octave bandwidth interference suppression circuit. The circuit accomplishes the function of a tunable frequency notch through an interferometer architecture. The relative delay in the interferometer paths is varied with GaN monolithic microwave integrated circuit tunable delay lines. The delay is adjusted by varying the drain voltage of cold-FET connected high electron mobility transistors acting as varactors. Two types of periodically-loaded delay lines are compared: a uniform and a tapered design. A simple theoretical study, relating the delays and amplitudes in the interferometer circuit branches, is developed to inform the design. Two interference suppression hybrid circuits are implemented, and measurements demonstrate a 25–40 dB notch across the 2.24–4 GHz range for the uniform delay line, and 2.32–4.13 GHz for the tapered design. The return loss for both designs remains below 10 dB. Measurements with two tones spaced 0.5 and 1 GHz for varying tone power are performed to quantify suppression. The circuit can handle an input power of 37 dBm and maintains performance with two simultaneous 25 dBm tones spaced 0.5 GHz apart. Linearity is characterised with 10 MHz two-tone measurements, and the circuit demonstrates a 3rd-order intercept input power larger than 30 dBm for control biases above −12 V.
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4.
  • Robinson, Megan C., et al. (författare)
  • Tunable Dual-Frequency Interference Suppression Circuit with GaN MMIC Delay Lines
  • 2023
  • Ingår i: 2023 53rd European Microwave Conference, EuMC 2023. ; , s. 247-250
  • Konferensbidrag (refereegranskat)abstract
    • This paper presents a broadband interference suppression circuit covering the 2-4 GHz octave. The circuit is capable of placing simultaneously two notches within the band with tunable center frequencies. A hybrid four-branch interferometer topology with gain incorporates GaN MMIC loaded tunable transmission-line delays. The circuit reduces the power of interfering signals by at least 10 dB, while amplifying the desired signal by as much as 18 dB. The overall circuit had a NF of 5-8.5dB across the band. This technique lends itself to produce sharp notches without the requirement of high-Q resonators, so implementations on low complexity PCBs is feasible.
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