cascode%20stage%20amplifier_web

cascode%20stage%20amplifier_web - Cascode Stage Amplifier...

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Prepared by Dr. Dongsheng Ma Copyright 2007 1 Cascode Stage Amplifier
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Prepared by Dr. Dongsheng Ma Copyright 2007 2 Boosted Output Impedances
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Prepared by Dr. Dongsheng Ma Copyright 2007 3 Bipolar Cascode Stage
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Prepared by Dr. Dongsheng Ma Copyright 2007 4 Maximum Bipolar Cascode Output Impedance 1 1 max , 1 1 max , 1 O out O m out r R r r g R β π
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Prepared by Dr. Dongsheng Ma Copyright 2007 5 PNP Cascode Stage
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Prepared by Dr. Dongsheng Ma Copyright 2007 6 Another Interpretation of Bipolar Cascode ¾ Instead of treating cascode as Q 2 degenerating Q 1 , we can also think of it as Q 1 stacking on top of Q 2 (current source) to boost Q 2 ’s output impedance.
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Prepared by Dr. Dongsheng Ma Copyright 2007 7 False Cascodes ¾ When the emitter of Q 1 is connected to the emitter of Q 2 , it’s no longer a cascode since Q 2 becomes a diode-connected device instead of a current source.
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Prepared by Dr. Dongsheng Ma Copyright 2007 8 MOS Cascode Stage
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Prepared by Dr. Dongsheng Ma Copyright 2007
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This note was uploaded on 04/03/2008 for the course ECE 304 taught by Professor Ma during the Spring '08 term at University of Arizona- Tucson.

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cascode%20stage%20amplifier_web - Cascode Stage Amplifier...

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