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In this paper, a dual gain control (DGC) technology is proposed to achieve large gain variation range and good gain flatness for every controllable gain in ultra wide frequency band. The DGC technology includes a modified current mirror structure and a dynamic signal feedback structure. Based on the DGC technology, a variable gain amplifier with both large dynamic gain variable range and good gain...
This paper presents a general methodology to design a LNA with current reuse topology for two standards which can operate at mobile band of 1.8GHz and WLAN band of 5.2GHz. A novel current reuse topology is proposed to reduce the power consumption and enhance the transmission gain. The input matching is achieved through serial and parallel LC circuit. Inductor degeneration in emitter is introduced...
A low noise amplifier with dB-linear variable gain has been designed and fabricated based on high performance SiGe HBT in this paper. Negative feedback technology has been adopted to change the transmission gain of HBT through variable resistance of a forward biased p-i-n diode in the feedback path. The simulation results and measurement results agree well in frequency of 1.8GHz for CDMA application...
The thermal resistance matrix of multi-finger power HBT including self-heating thermal resistance and mutual thermal coupling resistance is presented to describe the improvement mechanism of non-uniform finger spacing technology. It is shown in the thermal network of multi-finger power HBT that the finger temperature depends on the value of thermal resistance matrix. For HBT with non-uniform finger...
A series of coil coatings based on a polyester/melamine resin formulation, incorporating different pigment systems, were naturally weathered after being exposed to the elements in Hainan, PRC, for 2 years. The surface chemistry and morphology, before and after weathering, was investigated using both traditional (i.e., gloss retention, color change) and novel (i.e., X-ray photoelectron spectroscopy...
The two-dimensional temperature profile of a multi-finger power SiGe HBT is studied with the electrothermal model, which shows that there is an uneven temperature profile over the device finger for HBT with uniform finger length. Because of the positive current-temperature feedback, the uneven temperature profile will leads to an anomalous current distribution, which eventually caused the thermal...
As an effective and feasible method, the technology of non-uniform emitter finger spacing has been used to alleviate the thermal effects and improve the uneven temperature profile in multi-finger power SiGe HBTs. However, for the HBT with dozens of emitter fingers, designing multiple finger spacing values becomes trivial and time-consuming. In the paper, a new thermal design methodology namely Grouping...
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