Lecture 21

Lecture 21 slide 5 ee105 fall 2013 prof ming c wu

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Unformatted text preview: L Prof. Ming C. Wu 2 Dealing with a FloaFng Capacitance §༊  Recall that a pole is computed by finding the resistance and capacitance between a node and (AC) GROUND. §༊  It is not straighRorward to compute the pole due to CF in the circuit below, because neither of its terminals is grounded. Lecture 21 – Slide 5 EE105, Fall 2013 Prof. Ming C. Wu Miller’s Theorem §༊  If Av is the voltage gain from node 1 to 2, then a floaFng impedance ZF can be converted to two grounded impedances Z1 and Z2: V1 − V2 V1 V1 1 = ⇒ Z1 = Z F = ZF ZF Z1 V1 − V2 1 − Av V1 − V2 V =− 2 ZF Z2 EE105, Fall 2013 ⇒ Z2 = −ZF V2 1 = ZF V1 − V2 1 − 1 / Av Lecture 21 – Slide 6 Prof. Ming C. Wu 3 Miller MulFplicaFon §༊  Applying Miller’s theorem, we can convert a floaFng capacitance between the input and output nodes of an amplifier into two grounded capacitances. §༊  The capacitance at the input node is larger than the original floaFng capacitance. Z2 = Z1 = ZF...
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