1) School of Aeronautics and Astronautics, Zhejiang University
LNA MMIC, gate biasing circuit, Vth compensation, temperature compensation
The final version of this article with its full bibliographical information is available. To access the article, click here (Vol. 14 (2017), No. 18 pp. 20170711-20170711).
A broadband low-noise amplifier (LNA) MMIC with a novel on-chip switchable gate biasing circuit is proposed. The biasing circuit is able to switch on/off the low noise amplifier and compensate the variation of threshold voltage (Vth) and temperature, hence improving the robustness of the amplifier over a wide operating frequency range. The switching frequency is up to 1MHz, and the fluctuations of on-state quiescent current and power gain of the amplifier are within ±7.9% and ±0.8% when the threshold voltage varies from -0.15 V to 0.15 V. The power gain variation is stabilized within ±1.25 dB by the biasing network, while the temperature changes from -55°C to 125°C. Realized in 0.15 μm E-mode pHEMT technology with size of 2.0 mm×1.3 mm, the LNA provides a typical gain of 24 dB while maintaining input and output return loss better than 10 dB and the noise figure (NF) of the LNA smaller than 1.6 dB from 4 GHz to 20 GHz.
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