Input Resistance in BJT Formulas

Input Resistance is the resistance seen by the current source or voltage source which drives the circuit. And is denoted by R_in. Input Resistance is usually measured using the Kilohm for Electric Resistance. Note that the value of Input Resistance is always negative.

Formulas to find Input Resistance in BJT

fxCommon Mode Input Resistance of BJT Half-CircuitGo

fxInput Resistance of Common Gate Circuit given TransconductanceGo

fxInput Resistance of BJTGo

BJT formulas that make use of Input Resistance

fxShort Circuit Current Gain of BJTGo

fxOpen Circuit Voltage Gain given Open Circuit TransresistanceGo

fxFinite Input Voltage of BJT at Unity Gain FrequencyGo

fxFinite Input Voltage of BJT at Unity Gain Frequency given Complex Frequency VariableGo

List of variables in BJT formulas

fx Common Emitter Current Gain Go

fx Output Resistance Go

fx Load Resistance Go

fx Transconductance Go

fx Finite Output Resistance Go

fx Input Voltage Go

fx Signal Current Go

FAQ

What is the Input Resistance?

Input Resistance is the resistance seen by the current source or voltage source which drives the circuit. Input Resistance is usually measured using the Kilohm for Electric Resistance. Note that the value of Input Resistance is always negative.

Can the Input Resistance be negative?

Yes, the Input Resistance, measured in Electric Resistance can be negative.

What unit is used to measure Input Resistance?

Input Resistance is usually measured using the Kilohm[kΩ] for Electric Resistance. Ohm[kΩ], Megohm[kΩ], Microhm[kΩ] are the few other units in which Input Resistance can be measured.

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