DC-baising_for_bipolar_amp

DC-baising_for_bipolar_amp - DC Biasing for Bipolar...

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1 DC Biasing for Bipolar Amplifiers ¾ General Considerations ¾ DC Biasing ¾ Bipolar Amplifier Topologies ¾ Summary and Additional Examples
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ECE 304 Spring 2008 by Brian Ma 2 Voltage Amplifier ¾ In an ideal voltage amplifier, the input impedance is infinite and the output impedance zero. ¾ But in reality, input or output impedances depart from their ideal values.
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ECE 304 Spring 2008 by Brian Ma 3 Input/Output Impedances ¾ The figure above shows the techniques of measuring input and output impedances. x x x i V R =
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ECE 304 Spring 2008 by Brian Ma 4 Input Impedance Example I ¾ When calculating input/output impedance, small-signal analysis is assumed. π r i v x x =
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ECE 304 Spring 2008 by Brian Ma 5 Impedance at a Node ¾ When calculating I/O impedances at a port, we usually ground one terminal while applying the test source to the other terminal of interest.
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ECE 304 Spring 2008 by Brian Ma 6 Impedance at Collector ¾ With Early effect, the impedance seen at the collector is equal to the intrinsic output impedance of the transistor (if emitter is grounded). o out r R =
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by Brian Ma 7 Impedance at Emitter ¾ The impedance seen at the emitter of a transistor is approximately equal to one over its transconductance (if the base is grounded). ) ( 1
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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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DC-baising_for_bipolar_amp - DC Biasing for Bipolar...

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