L2_2-5.9.2 Analysis of the CE High Frequency Response L2_2

# L2_2-5.9.2 Analysis of the CE High Frequency Response L2_2...

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5.9.2 CE High Frequency Response Lecture 2 Part 2 Jan. 14, 2009 Zubair Rehman

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2 1. Figure 5.71(a) Capacitively Coupled CE Amplifier. 1. 3-1 AC Model of DC voltage source 3-2 AC Model of DC current source 3-3 3-4 3-5 DC Model of sinusoidal sources 1. Return To Figure 5.71 Connect AC short to V CC EE Nodes Cross out I - AC Open Circuit AC Shorts across C C1 , C C2 , C E 1. Draw AC Equivalent Circuit
3 Observations ) ( || 1 2 1 1 2 TH x TH x TH TH TH R r r R r r R r x V V + = + + = π 1. R L , R C , r o , are in parallel R L = R L || R C || r o 2. 3. V TH1 = V sig x {(R B ) / (R sig + R B )} R TH1 = R B || R sig ) ( || 1 2 1 2 TH x TH x TH B sig B sig TH R r r R r r R r x R R R x V V + = + + + =

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4 I 1 = I π + I μ I π = s C π x V π I μ = s C μ ( V b’ - V C ) = s C μ (V π - V O ) V O = R L (I μ - g m V π ) At Midband V O / V π = -g m R L ’ = midband gain | Typical Midband Gain | > 20 At the upper half-power frequency
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L2_2-5.9.2 Analysis of the CE High Frequency Response L2_2...

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