Discrete Amplifiers Formulas
Discrete Amplifiers formulas cover Thermal Voltage, Small-Signal Emitter Resistance, Transistor Transconductance and more. These calculators let you solve for any unknown by entering the values you already know. Use them for quick design checks, study, and verifying real circuits.
Discrete Amplifiers Formula Calculators
- Thermal Voltage VT = k · T / q
- Small-Signal Emitter Resistance re = VT / Ie
- Transistor Transconductance gm = Ic / VT
- Diode Dynamic Resistance rd = VT / Id
- Common-Emitter Voltage Gain Av = −Rc / re
- BJT Alpha–Beta Relationship α = β/(β+1), β = α/(1−α)
- Darlington Pair Current Gain βtotal = β1 · β2
- Emitter-Follower Input Impedance Zin ≈ β · RE
- Cascaded Amplifier Gain Av = Av1 · Av2 · Av3
- JFET Drain Current (Shockley) Id = Idss · (1 − Vgs/Vp)²
- MOSFET Drain Current (Saturation) Id = K · (Vgs − Vth)²
- Transistor Switch Base Resistor Rb = (Vin − Vbe) · β / Ic
- Amplifier Power Gain Ap = Av · Ai
- BJT Emitter-Bias Current Ic ≈ (Vb − Vbe) / Re
- Common-Source JFET Gain Av = −gm · Rd
- Common-Collector Current Gain Ai = β + 1
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