Electronics Coursework Example | Topics and Well Written Essays - 2500 words

Electronics - Coursework Example The gain of an amplifier is usually given in decibels or its unit less if the input and output variables are the same (all current, voltage or power. The power gain of an amplifier depends on the sources and load resistances used and its voltage gain. The amplifier should be linear in most cases hence its gain should be constant. Electronic amplifiers find their applications in Radios, Television Transmitters, Receivers, and high-fidelity stereo equipments, Microcomputers, and other electronic digital equipments. The 1Mï â€" and 10kï â€" potentiometer/decade boxes were used to set VCE and VBE to the values shown in table 1 to give the input characteristics of the BJT. The voltages across RB were measured and recorded for all measurements of VCE and VBE. The 10kï â€" potentiometer/decade box was s3et to its maximum value so that the output characteristics could be determined. The 1Mï â€" potentiometer/decade box was adjusted to set Ib to 10ï  ­A, and the desired values of RB were calculated using the measured values of RB. the value of 10kï â€" potentiometer/decade box was adjusted for all values of VCE in table 2 of the results analysis while Ib was kept constant. The voltage across the 100ï â€" resistor was measured and recorded for each combination of VCE and IB. In common emitter configuration, the input is connected between the base and the emitter while the output is taken between collector and emitter. The emitter is the common terminal as shown in the above figure. Emitt er base voltage is the input voltage, base current flows in the circuit and then the in the output resister, hence there will be high power and voltage gains and its output and input voltage ratio is moderate hence this configuration is commonly used. Increasing the supply voltage causes the base current to be lower for a given value of base-emitter voltage; this implies that higher values of supply voltage leads to greater collector-base junction reverse bias, hence greater depletion region