1. Figure Q1 shows a two-stage BJT amplifier where the transistors Q and Q₂ are matched with the forward current gain, ß = 125. The resistances are given as Rs = 100 Q, R₁ = R₂ = 1 MQ, Rc1 = 10 kN, RE1 = 1 kN, R3 = 100 kn, R4 = 22 kn, Rc2 = 1 kQ, RE2 = 100 S2, while the external capacitances are given as C₁ = C₂ = 10 μF and CE1 = CE2 = 40 uF. Assume that the internal resistances rb0, ruco and ro = 50 kn. Vs Rs R₁ Rc1 REI C₂ HF Figure Q1 R3 R₁ Rc2 RE2 Vcc 22 Vo a) The circuit has DC bias currents of Ici = 5.3 mA and Ic2 = 14.6 mA. Compute the hybrid- л parameters, gm1, gm2, l'al and ra2 for the transistors. b) Sketch the small-signal equivalent circuit in a form suitable for low-frequency AC analysis. c) Apply short-circuit time constant method to find the equivalent resistance seen by each of the external capacitor. d) Compute the lower 3-dB frequency (fi) of the amplifier.
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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