) A common source amplifier circuit based on a single n-channel MOSFET is shown in Figure 4b. Assume that the transconductance gm = 60 mS (equivalent to mA / V) %3D and drain source resistance, rDs, is so large it may be neglected. Vcc = 15 V 210 k2 5.2 k2 V out Vin 280 k2 3.8 k2 GND = 0 V Figure 4b. i) Draw the simplified equivalent circuit, which represents the entire amplifier, including the MOSFET, when operating under small signal conditions in the mid-band frequency range (that is assuming the capacitors are short circuit for a.c. signals). State each parameter and its unit of the ac small signal model of the MOSFET. ii) Calculate the open circuit voltage gain Av = Vout / Vin- iii) The amplifier has a load of 10 kN. Determine the current gain A¡ = iout / iin.
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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