Development of highly dense four-stage flat-gain 1-W 6-18-GHz MMIC power amplifier chip

A flat gain/power responses 618 GHz power amplifier MMIC with high PAE by using transformer networks

“…It has the characteristics of accuracy, robustness, and high resolution. This article extends the technique of [1][2][3] to extract both early-time scattering centers and late-time natural resonance frequency, simultaneously. In [1,2], we used the undamped exponential models as in the conventional fast Fourier transform (FFT)-based CLEAN.…”

“…This article extends the technique of [1][2][3] to extract both early-time scattering centers and late-time natural resonance frequency, simultaneously. In [1,2], we used the undamped exponential models as in the conventional fast Fourier transform (FFT)-based CLEAN. In contrast, the proposed generalized earlytime/late-time EP-based CLEAN algorithm uses the damped exponential model for both early-time scattering center extraction and late-time resonance frequency extraction by employing the duality existing between them.…”

“…For the successful radar target recognition, it is recommended that these two features are used simultaneously. In the previous research [1][2][3], we described how the EP-based CLEAN may be applied for scattering center extraction and natural frequency extraction. It has the characteristics of accuracy, robustness, and high resolution.…”

“…Up to now, several approaches have been investigated in designing power amplifiers with wide-band operations and high power performance [1][2][3][4]. The distributed amplifier design approach has shown inherently wide-band and stability characteristics [1].…”