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Software-defined radio chip sets are becoming increasingly available for a wide variety of RF bands including the industrial, scientific, and medical (ISM) bands. Efficient operation of systems like these typically requires high-performance, multifunctional RF filters to enable preselection of the signals of interest while suppressing undesired interferers and noise. To fulfill these requirements...
This paper reports on the mechanical and electrical properties of creep-resistant nanocrystalline gold-vanadium (Au-V) thin films that are employed in electrostatically-actuated microcorrugated diaphragms (MCDs) of frequency-reconfigurable all-silicon cavity filters. Solid solution strengthened Au-V MCDs featuring the lowest stress relaxation to date were built and experimentally tested. In a 3-hour...
In this paper, a terahertz wideband sub-harmonic mixer based on the Schottky anti-parallel diodes pair and MASTER technology is presented. The mixer circuit is fabricated on a 0.05mm quartz substrate including Schottky anti-parallel diodes pair, RF/LO transition, IF matching networks and filtering circuits. The diode circuit is fabricated on a quartz substrate directly by MASTER technology. The research...
Uni-traveling-carrier photodiodes with novel dual-drifting-layer structure is proposed to realize wide bandwidth and high saturation power performance. High-speed operation at high bias voltage is demonstrated by optimizing the electric field profile within the dual-drifting-layer structure.
Depletion region of uni-traveling-carrier photodiodes (UTC-PDs) is optimized. Wide bandwidth of 28.5 GHz and high saturation photocurrent of 38 mA at 20 GHz are achieved for a 14-µm diameter device.
A novel low-noise amplifier (LNA) designed for COMPASS receiver is proposed in this paper. Inductively degenerated technique and resistive feedback technique are utilized to decrease the noise figure. It not only lowers the noise figure, but also decreases the area of the chip. SiGe-BiCMOS process is used to design this LNA. With a supply voltage of 1.8V, the proposed LNA achieves an NF of 1.17 dB...
A reconfigurable bandstop filter using FET RF switch (AS179-92) with tiny insertion loss and realizable expansibility is presented. The tuning range from 1.0 GHz to 1.5 GHz controlled by two DC bias voltages is achieved by simulation of the corresponding frequencies. Moreover, the simulated results of the proposed filter demonstrate the filter's many merits including deep stopband rejection, simple...
An improved current bleeding CMOS mixer is designed in this paper. The conversion gain of the mixer is increased and the flicker noise of the mixer is reduced by inserting the inductor to form resonant circuit with parasitic capacitors of the source ports of the switch transistors in Gilbert mixer. The mixer is designed by using SMIC 0.18 um CMOS process. The simulated results show that the mixer...
This paper describes 3.3 V silicon down conversion mixer with a current bleeding Gilbert multiplier and also compares the conventional current bleeding Gilbert mixer with an improved current bleeding circuit, detail analysis are given about the two circuits, using 0.35 um process. With a 1.675 GHz local oscillator (LO) and a 1.575 GHz RF input. The results show that the gain and IIP2 of the improved...
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