A new integrable composite circuit with improved FET-like characteristics
A new composite circuit comprising five active devices (a JFET and four bipolar transistors) and three passive resistors is described and shown to exhibit FET-like characteristics with much improvement in thermal stability and transfer curve linearity over a wide range of input bipolar voltage. The input resistance of the proposed circuit is, however, equal to that of the FET with the additional advantage that it continues to be high even for positive input voltage. The proposed structure is fully compatible with silicon integrated circuit (IC) technology and may thus be commercially mass-produced as a three-terminal device with its terminals designated as gate, drain, and source.
Optimizing the performance of modified field effect transistor
ABSTRACT An experimental study of the JFET-BJT combination as reported by Khan and Singh (1985 b) is described with a view to obtain optimum performance against variations in circuit parameters. Important conclusions are drawn which pave the way for easier development of linear instrumentation systems.
Quantitative and qualitative relationship between swirl burner operatingconditions and pulverized coal flame length
Abstract Currently, there are used in power plants two types of burners to combustion the pulverized coal: jet burners and swirl burners. Most of the published works in the field of analysis of burners operating conditions are related to jet burners and are limited to initial region of the flame at the outlet of the burner. For jet burners an offset between the burner outlet and the flame beginning point could be analyzed. In the case of swirl burners with the pre-mixing diffuser chamber an offset between flame ignition point and burner outlet is usually not visible. Because already in the pre-mixing diffuser chamber of swirl burner occurs the ignition of coal-dust together with oxidant-gas cloud and thereby the formation of the flame. Therefore, the analysis of operating conditions for this types of burners requires a different approach. There is a lack of researches, in which will be analyzed changes of the flame length, that are caused by changes of design and operating parameters of swirl burner with the pre-mixing diffuser chamber. Therefore the aim of this study was to implement and verify the methodology for estimating the flame length, which will allow monitoring changes of operating conditions, that are caused by changes of design and operating parameters of swirl burner with the pre-mixing diffuser chamber. To carry out the analysis of the image of the coal flame, the two algorithms have been presented. This two algorithms, being based on the video images of the coal flame allows to specify and detect the end point of the flame and on that basis the length of the flame, as well as the fluctuation changes of flame length can be later determined. Both, the change thermal loads of coal burner, streams of secondary air, as well as the constructional change of the angle of swirler assemblies, resulted in distinct changes in the length of the pulverized coal flame.