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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.
The strings:
S7P5A51 (Physical Change).
The math:
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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