In this paper, the designs and experimental performances of wideband (higher than one octave) high-efficiency, high-power amplifiers (HPA) working in the 1–4 GHz range, using the same GaN process, are presented. They are based on the Bode–Fano integrals, which can be applied to a trade-off calculation between bandwidth and efficiency. Firstly, an microwave intregrated circuits (MIC) wideband HPA, externally matched, is presented. It generates a continuous wave (CW) output power (Pout) greater than 40 W, a power gain (GP) higher than 9.2 dB and a corresponding power added efficiency (PAE) (drain efficiency (DE)) ranged between 36 and 44% (40 and 48%) over the 1–3 GHz bandwidth. Two other amplifiers have been designed upon the same theoretical methodology, with a passive GaAs MMIC circuit technology, enabling to reduce the final size down to 420 mm2. The first internally matched Quasi monolithic microwave intergrated circuits (Quasi-MMIC) single-ended HPA generates a pulsed Pout greater than 25 W, GP higher than 9.8 dB, and a corresponding PAE (DE) ranged between 37 and 52.5% (40 and 55%) over the 2–4 GHz bandwidth. The second internally matched Quasi-MMIC HPA, based on balanced architecture, generates a pulsed Pout higher than 45 W, GP higher than 9.5 dB and PAE (DE) ranged between 33 and 44% (38 and 50%) over the 2–4 GHz bandwidth. These results are among the best ones published in terms of PAE and Pout in instantaneous octave bandwidth in the 1–4 GHz frequency range.
International audienceThis paper proposes a fully calibrated four channel high sampling rate oscilloscopic system based on the use of Track and Hold Amplifiers. The system achieves a high equivalent sampling rate (up to 1THz) using coherent interleaved sampling principle. An accurate calibration procedure allows a 10 kHz resolution over a 3 GHz bandwidth is applied. The capabilities of the system are presented and validated by characterizing a band-pass filter and an S-band 50 W GaN high power broadband amplifier under wideband CW pulsed signal excitation. S-parameters and power characteristics measurements are also presented. The fully calibrated system has the capability to give an accurate visualization of time-domain distortions of input/output voltage and current waveforms within the pulse. It also allows the determination of rising and falling transitions times of the pulse
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