


Depending on the signals being processed, different equivalent circuits are used:
: Used to find the operating point (Q-point). The transistor is modeled as a diode (base-emitter) and a constant current source (collector-emitter). Capacitors are treated as open circuits.
: Used to analyze amplification properties like gain and impedance. DC voltage sources are replaced with shorts, and the transistor is replaced by a linear model. 2. Common Bipolar Junction Transistor (BJT) Models For BJT analysis, two models are standard:

Depending on the signals being processed, different equivalent circuits are used:
: Used to find the operating point (Q-point). The transistor is modeled as a diode (base-emitter) and a constant current source (collector-emitter). Capacitors are treated as open circuits. shema zameshhenija tranzistora
: Used to analyze amplification properties like gain and impedance. DC voltage sources are replaced with shorts, and the transistor is replaced by a linear model. 2. Common Bipolar Junction Transistor (BJT) Models For BJT analysis, two models are standard: Depending on the signals being processed
