A versatile low-voltage CMOS circuit with a trapezoidal transconductance characteristic and independently programmable slope, height and horizontal position is designed in 0.18[Formula: see text][Formula: see text]m standard CMOS technology. The proposed circuit is constructed from combination of two linearization methods to enhance the linearity in low voltage applications. A [Formula: see text]118[Formula: see text]dB THD was obtained for a 400[Formula: see text]mV peak to peak differential input voltage at 125[Formula: see text]KHz. Simulation results using HSPICE that verify the functionality of circuit with 1.5[Formula: see text]V supply are presented. The total power consumption is only 120[Formula: see text][Formula: see text]W. The circuit can find application in the implementation of membership functions in analogue and mixed-signal neuro-fuzzy systems.
In this investigation an attempt is made to find the best hub to tip ratio, the maximum number of blades, and the best angle of attack of an axial fan with flat blades at a fixed rotational speed for a maximum mass flow rate in a steady and turbulent conditions. In this study the blade angles are varied from 30 to 70 degrees, the hub to tip ratio is varied from 0.2 to 0.4 and the number of blades are varied from 2 to 6 at a fixed hub rotational speed. The results show that, the maximum flow rate is achieved at a blade angle of attack of about 45 degrees for when the number of blades is set equal to 4 at most rotational velocities. The numerical results show that as the hub to tip ratio is decreased, the mass flow rate is increased. For a hub to tip ratio of 0.2, and an angle of attack around 45 degrees with 4 blades, a maximum mass flow rate is achieved.
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