Abstract: In this paper a new method for determining the component values and transistor dimensions for CMOS operational amplifiers (Op-Amps) is presented. As a wide variety of design objectives and constraints are Posynomial function of the design variables, the Optimization is done by Geometric Programming. As a consequence we can efficiently determine globally optimal trade-offs among competing performance measures such as power, open-loop gain and bandwidth. In this paper I applied this method to a Two Stage Cascoded operational amplifier. The paper shows how the method can be used to synthesize robust design, i.e., design guaranteed to meet the specifications for a verity of process condition and parameters. The synthesis method is fast and determines the globally optimal design

• Publication Date: 12-Mar-2012
• DOI: 10.15224/978-981-07-1847-3-365
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Abstract: A brushless DC (BLDC) motor is a synchronous electric Motor powered by direct-current (DC) electricity and having an electronic commutation system, rather than a mechanical commutator and brushes. In BLDC motors, current to torque and voltage to rpm are linear relationships. This linearity provides an excellent opportunity to use the BLDC motor in the conventional ceiling fans. This paper presents practical implementation of such BLDC motor for ceiling fan application along with the actual power measurements in comparison with conventional ceiling fans. Complete electronics and the associated advantages and disadvantages of this BLDC ceiling fans are also presented

• Publication Date: 12-Mar-2012
• DOI: 10.15224/978-981-07-1847-3-369
• Views: 0
• Downloads: 0