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There are three primary types of BJT configurations: common-emitter (emitter is common to both input and output circuits), commom-collector (collector is common to both input and output circuits) and common-base (base is common to both input and output circuits). Figure 122.6 illustrates the common-emitter and common-collector .
(a) Indicate the common application scenario for each BJT configuration
(b) The following are circuit values for the common-emmitter of figure 122.6(a):
Vs = 1 cos(6.28 x 103t) mV; VCC = 15 V
Current gain, β = IC/IB = 100 .
R1 = 68 kΩ; R2 = 11.7 kΩ;
RC = 200 Ω; RE = 200 Ω;
RL = 1.5 kΩ; Rs = 0.9 kΩ;
Determine VCEQ and the region of operation.
S7P5A51 (Physical Change).
Pj Problem of Interest is of type change (physical change). Transistors are primarily used for signal amplification and switching. Both are change problems.
(a)i Common-Emitter: output at collector and inverted.
Application scenario: if relatively high voltage and power gain is desired. Low input impedance and high output impedance.
(ii) Common-Collector: output at emitter and noninverted.
Application scenario: voltage gain considered at unity. High input impedance and low output impedance.
(iii) Common-Base: rarely used.
Application scenario: unstable at high gain values. Very low input impedance and high output impedance.
Sometimes used as the first RF amplifier stage, amplifying signals from radio antennas.
(b) Try it. Answer: VCEQ = 13.00 V; BJT is in the active region.
The point . is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.
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