Analog & Circuit TheoryDiscipline: Analog Electronic Circuits (EEE2002)
BJT Biasing, Q-Point & Small-Signal CE Amplifier Analyzer
Interactive DC/AC load line engine computing voltage-divider operating point (Q-point), thermal stability factor (S), and dynamic small-signal AC gain with saturation/cutoff waveform clipping.
Instrument State:Live Analytical DSP Engine
BJT Biasing, Q-Point & Small-Signal CE Amplifier
Voltage-Divider DC Load Line · Thermal Stability $S(I_{CO})$ · Dynamic Small-Signal AC Gain & Clipping
Presets:
Biasing ParametersActive Linear
Supply Voltage (Vcc)12 V
R₁ (Top)47 kΩ
R₂ (Bottom)10 kΩ
Collector Rc2.2 kΩ
Emitter RE0.68 kΩ
Load Resistor RL10 kΩ
Current Gain β160
Emitter Bypass Capacitor ($C_E$)Bypassed (High AC gain Av = -rc/re)
AC Input Peak ($v_{in}$)15 mV
DC Load Line ($R_C + R_E$) AC Load Line ($r_c = R_C \parallel R_L$)Q-Point: (6.30 V, 1.98 mA)
Midband Gain: -138.0 · Intrinsic Emitter Resistance $r_e$: 13.1 Ω
Rule of thumb: Design $R_E$ such that $V_E \approx 0.1 V_{CC}$ to $0.2 V_{CC}$ for robust thermal immunity.
Technical Instrument Specifications
Biasing TopologySelf-Bias / Voltage-Divider Network (R1, R2, RC, RE)
Operating LimitsIC(sat), VCE(cutoff), Q-Point (VCEQ, ICQ)
Small-Signal ACAv (voltage gain), Zin, Zout, re (dynamic resistance)
Stability AnalysisS(ICO) factor & thermal runaway boundary
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