# Ming c wu 8 large signal analysis vin1 vin 2 vbe1 vbe

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Unformatted text preview: I 2 I I C 2 = EE − ΔI 2 ΔI C1 = g m ( ΔV − ΔVP ) I C1 = ΔI C 2 = g m ( −ΔV − ΔVP ) ΔI C1 = −ΔI C 2 ⇒ ΔVP = 0 EE105, Fall 2013 Lecture 22 – Slide 14 Prof. Ming C. Wu 7 Extension of Virtual Ground §༊  It can be shown that if R1 = R2, and the voltage at node A goes up by the same amount that the voltage at node B goes down, then the voltage at node X does not change. vX = 0 EE105, Fall 2013 Lecture 22 – Slide 15 Prof. Ming C. Wu Small- Signal Diﬀeren?al Gain §༊  Since the output signal changes by - 2gmΔVRC when the input signal changes by 2ΔV, the small- signal voltage gain is –gmRC. §༊  Note that the voltage gain is the same as for a CE stage, but that the power dissipa?on is doubled. Av = EE105, Fall 2013 Lecture 22 – Slide 16 − 2 g m Δ...
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