EE 230 Lecture 17 Spring 2010

# EE 230 Lecture 17 Spring 2010 - EE 230 Lecture 17 Nonideal...

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EE 230 Lecture 17 Nonideal Op Amp Characteristics

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Quiz 11 IN OUT 1 2 3 The dc gain of this circuit was measured to be 5 and the 3dB bandwidth was measured to be 600KHz. Determine as many of the following as possible from this information if it is known that the op amp can be modeled as a single-pole lowpass amplifier. Ao (dc gain of the Op Amp) P (pole of the Op Amp) GB (gain-bandwidth product of Op Amp)
And the number is ? 1 3 8 4 6 7 5 2 9

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And the number is ? 1 3 8 4 6 7 5 2 9
Quiz 11 IN OUT 1 2 3 The dc gain of this circuit was measured to be 5 and the 3dB bandwidth was measured to be 600KHz. Determine as many of the following as possible from this information if it is known that the op amp can be modeled as a single-pole lowpass amplifier. A o (dc gain of the Op Amp) p (pole of the Op Amp) GB (gain-bandwidth product of Op Amp) Solution: Insufficient information to determine A o or GB 2 O 1 R GB=K BW= 1+ BW R ⎛⎞ ⎜⎟ ⎝⎠

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Quiz 11 IN OUT 1 2 3 The dc gain of this circuit was measured to be 5 and the 3dB bandwidth was measured to be 600KHz. Determine as many of the following as possible from this information if it is known that the op amp can be modeled as a single-pole lowpass amplifier. A o (dc gain of the Op Amp) p (pole of the Op Amp) GB (gain-bandwidth product of Op Amp) Solution: Insufficient information to determine A o or GB 2 O 1 R GB=K BW= 1+ BW R ⎛⎞ ⎜⎟ ⎝⎠ GB=5 600KHz = 3MHz =(18.8M / ) Rad Sec
Differential Amplifiers Instrumentation Amplifier Can reduce effects of dc offset if gain must be very large Must pick C to that frequencies of interest are in passband Review from Last Time

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Impedance Converters ( ) 11 2 X 2 V G +G = V G ( ) X 3 I= V-V G 13 IN 2 ZZ Z= - Z Observe this input impedance is negative! Review from Last Time
Impedance Converters Z 1 Z 2 Z 5 V 1 I 1 IN Z 3 Z 4 One Port 135 IN 24 ZZZ Z= ZZ If Z 1 =Z 3 =Z 4 = Z 5 =R and Z 2 =1/sC ( ) 2 IN RCs This is an inductor of value L=R 2 C If Z 2 =R 2 , Z 3 =R 3 , Z 4 =R 4 , Z 5 =R 5 and Z 1 =1/sC 35 IN RR sCR R This is a capacitor of value EQ C= C (can scale capacitance up or down) If Z 2 =Z 4 = Z 5 =R and Z 1 =Z 3 =1/sC ( ) 32 2 IN RC s This is a “super” capacitor of value 32 RC This circuit is often called a Gyrator Review from Last Time

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Nonideal Properties of Operational Amplifiers In even the most basic applications, the laboratory performance of the circuit often differs dramatically from what is predicted for some op amps. With proper knowledge of the characteristics of the op amp, designers can usually design circuits that behave almost like what is expected with ideal op amps Essential to know nonideal properties of the op amp and how to manage them to be an effective design engineer Review from Last Time
Some of the more common nonideal effects in Op Amp circuits Will try to identify the source cause of all of these problems and how they can be resolved V M t V IN (t) t V OUT (t) V DD t V OUT (t) V SS V DD t V SS V DD t V SS V DD t V SS V DD t V SS V DD t V SS V DD t V SS t V OUT (t) Review from Last Time

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EE 230 Lecture 17 Spring 2010 - EE 230 Lecture 17 Nonideal...

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