1. The following circuit shows a discrete common source MOSFET amplilier The MOSFTE is n-channel MOSFET. The transconductance of the n-channel MOSFET (g) is 3 mA/V. Raig 100 k2, RGI 47 MS, Raig 100 kC, Ra2 10 MQ, Rs=2 kQ, Rp-4 7 k2, RL 10 k2, Rsig 100 k2, C 1 pF, Cgd0.2 pF VA n The C-S MOSFET amplifier has three low break frequencies in low frequency band at fLI=1 Hz (caused by Cei), fiz 100 Hz (caused by Cs), fo= 10HZ (caused by Ccz) (a) Draw small signal equivalent circuit of the amplifier in low frequency band. VDD RG1 RD Cc2 Q1 Cc1 RL Rsig RG2 Cs Vsig RS
Power Amplifier
The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.
Maximum Efficiency Criterion
In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.
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