Chapter01-Part02-Amplifiers

Chapter01-Part02-Amplifiers - Department of Electrical and...

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Page 1 Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.1 J. Schwartz, 2007 Section 1 Amplifiers & Inverters Sedra/Smith sections 1.4, 1.5 & 1.7 (also useful: Appendix B & C) Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.2 J. Schwartz, 2007 Outline of Section 1 Analog Amplifiers – Linear amplifiers and transfer characteristics – Operating point – Classification of ideal amplifier topologies and desirable properties – Input/Output resistance Digital Logic Inverters – Voltage transfer characteristic – Noise margins – Ideal Inverter
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Page 2 Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.3 J. Schwartz, 2007 Signal Convention for Course • Total DC + signal quantities in lowercase symbol, uppercase subscript – Example: i D (t), v D (t) DC magnitudes in uppercase symbol and subscript – Example: I D , V D • Incremental signal quantities in lowercase symbol & subscript – Example: i d (t), v d (t) In general: ( )( ) () () t v V t v t i I t i d D D d D D + = + = ( ) () t v V t t v d D D + = + = ω sin 25 . 0 0 . 1 Example: Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.4 J. Schwartz, 2007 Linear Amplifiers Multiply amplitude of a signal by a constant scalar quantity Input: x in (t) Output (green): x out (t) Output (blue): x out (t) ( ) ( ) t x A t x in out = Time (msec) Volts (V)
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Page 3 Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.5 J. Schwartz, 2007 Observations • Multiply amplitude of a signal by a constant scalar quantity: linear amplification • Non-scalar/non-uniform amplification called distortion • Only signal portion of input is amplified here… but the DC component may be shifted too (offset) Input Undistorted Output (green) Distorted Output (blue) () ( ) t x A t x i o = Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.6 J. Schwartz, 2007 Linear Amplifiers Symbol for a single-ended input linear voltage amplifier v in v out A Ideally provides linear voltage gain regardless of the amplitude of the input signal v in v out A VDD VSS Real amplifiers have power supplies that limit the amplitude of the output signal If input is too large, output “clamps” Ö gain saturation () VSS VDD t v MAX out i.e.
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Page 4 Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.7 J. Schwartz, 2007 Voltage Transfer Characteristic (VTC) Ideal amplifier has linear input-output relationship Slope = Gain Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.8 J. Schwartz, 2007 Minimum/Maximum Inputs & Outputs Operation of amplifier in linear region limits input magnitude V in V out V in-min V out-min V in-max V out-max
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Page 5 Department of Electrical and Computer Engineering ECSE-330A Introduction to Electronics Amplifiers & Inverters 1.9
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This note was uploaded on 12/22/2010 for the course ECSE ecse 330 taught by Professor Rochette during the Winter '10 term at McGill.

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Chapter01-Part02-Amplifiers - Department of Electrical and...

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