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EE105 – Fall 2014 Microelectronic Devices and Circuits

1 1 Lecture12-Small Signal Model-BJT EE105 Fall 2014 Microelectronic Devices and Circuits Prof. Ming C. Wu 511 Sutardja Dai Hall (SDH) 2 Lecture12-Small Signal Model-BJT Introduction to Amplifiers Amplifiers: transistors biased in the flat-part of the i-v curves BJT: forward-active region MOSFET: saturation region In these regions, transistors can provide high voltage, current and power gains Bias is provided to stabilize the operating point (the Q-Point) in the desired region of operation Q-point also determines Small-signal parameters of transistor Voltage gain, input resistance, output resistance Maximum input and output signal amplitudes Power consumption 2 3 Lecture12-Small Signal Model-BJT transistor Amplifiers BJT Amplifier Concept The BJT is biased in the active region by dc voltage source VBE.

circuits and inductors by short circuits. – Find Q-point from dc equivalent circuit by using appropriate large-signal transistor model. • ac analysis: – Find ac equivalent circuit by replacing all capacitors by short circuits, inductors by open circuits, dc voltage sources by ground connections and dc current sources by open circuits.

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