EE 230 Lecture 8 Spring 2010

# EE 230 Lecture 8 Spring 2010 - EE 230 Lecture 8 Amplifiers...

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EE 230 Lecture 8 Amplifiers

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Quiz 7 A nonideal transresistance amplifier is shown. Represent this same amplifier as a nonideal voltage amplifier. 400 I 1 80 10 I 1
And the number is ? 1 3 8 4 6 7 5 2 9 ?

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Quiz 7 A nonideal transresistance amplifier is shown. Represent this same amplifier as a nonideal voltage amplifier. Solution: The nonideal circuits are identical so Alternately, 10 V I 1 1 =
Amplifiers are generally not ideal (but can be nearly ideal) OUT IN X = K X Gain can vary with frequency OUT IN = T ( s ) X ( ) Tj ω Review from Last Time

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Amplifiers are generally not ideal (but can be nearly ideal) OUT IN X = K X Amplifier will display some nonlinearity at extreme inputs (in transfer characteristics) ( ) OUT IN = f X The region of linear gain is often quite large for good amplifiers Review from Last Time
Amplifiers are generally not ideal (but can be nearly ideal) IN OUT The input and output impedances may not be ideal Example: Consider a Voltage Amplifier with a gain of 10 OUT IN V =10V OUT IN V= 5 V Review from Last Time

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Amplifiers are generally not ideal (but can be nearly ideal) OUT IN X = K X Amplifier will display some nonlinearity throughout (in transfer characteristics) ( ) OUT IN = f X Nonlinear distortion components will be present throughout region of operation K 0 1 X 0UT X IN Review from Last Time
Amplifiers Equivalence of functional form of all four basic types When nonideal, the functional form of all four basic amplifiers are identical and they differ only in the value of the model parameters

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Half-power Frequency and Amplifier Bandwidth The half-power frequency ω H is the frequency where the output power drops to ½ of the peak output power ( ) Aj ω Claim: The half-power frequency is the frequency where the magnitude of the voltage gain drops to where A 0 is the maximum gain 0 A 2 Proof: Review from Last Time 0 A 2
Half-power Frequency and Amplifier Bandwidth Definition: The amplifier bandwidth is the width of the “passband” of the amplifier

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EE 230 Lecture 8 Spring 2010 - EE 230 Lecture 8 Amplifiers...

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