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Amplifier Compensation Electronic Engineering © University of Wales Newport 2009 This work is licensed under a  Creative Commons Attribution 2.0 License .
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
Variation of Gain and Phase Shift with Frequency ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
[object Object],this gives  Example If ALF = 100, R = 10 k   and C = 10nF plot the gain against frequency curve and phase against frequency curve.  Note plot gain in dB. dB gain = 20 log (actual gain) Amplifier Compensation
Frequency Gain dB gain Phase 100 99.80 39.98 -3.60 200 99.22 39.93 -7.16 400 96.98 39.73 -14.11 700 91.54 39.23 -23.74 1000 84.67 38.55 -32.14 2000 62.26 35.88 -51.49 4000 36.97 31.36 -68.30 7000 22.17 26.91 -77.18 10000 15.72 23.93 -80.95 20000 7.93 17.99 -85.44 40000 3.98 11.99 -87.71 70000 2.27 7.13 -88.69 100000 1.59 4.03 -89.08 200000 0.80 -1.99 -89.53 400000 0.40 -8.01 -89.76 700000 0.23 -12.87 -89.86 1000000 0.16 -15.96 -89.90
 
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
[object Object],[object Object],[object Object]
[object Object],[object Object]
[object Object],[object Object],[object Object]
Multistage Amplifiers. ,[object Object],The overall gain would be A1 x A2 or A1 + A2 if the two gains are expressed in dBs.   A1 A2
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
Straight line up to 15 kHz at 89.5 dB Straight line from this point at -20 dB/dec up to 300 kHz x Now from this point the line rolls off at -40 dB/dec x Gain Curve f C1 f C2
Gain Curve f C1 f C2 Now the phase curve Effect of f C1 Effect of f C2 Line at 0 °  up to 1/10 f C1 Now a line at -45 °/dec up to 1/10 f C2 x Now a line at -90 °/dec up to 10 f C1 x Now a line at -45 °/dec up to 10 f C2 x Line at -180 °  above 10 f C2 Phase Curve
The Control of Gain using Negative Feedback ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
[object Object],[object Object],[object Object],We can derive a relationship between Vout and Vin. (i) (ii) (iii) A B Vout Vin Vf Va
[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
Gain Curve f C1 f C2 Phase Curve
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
Gain Curve f C1 f C2 Phase Curve
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
Problems associated with phase shift and NFB. ,[object Object],Amplifier Compensation A B Vout Vin Vf Va
[object Object],Amplifier Compensation A B Vout Vin Vf Va
[object Object],[object Object],135 ° Any value above this is unacceptable.  Where does this occur on our plot? Amplifier Compensation
Gain Curve f C1 f C2 Phase Curve -20dB/dec -40dB/dec
[object Object],[object Object],[object Object],[object Object],Amplifier Compensation
Amplifier Compensation This resource was created by the University of Wales Newport and released as an open educational resource through the Open Engineering Resources project of the HE Academy Engineering Subject Centre. The Open Engineering Resources project was funded by HEFCE and part of the JISC/HE Academy UKOER programme. © 2009 University of Wales Newport This work is licensed under a  Creative Commons Attribution 2.0 License . The JISC logo is licensed under the terms of the Creative Commons Attribution-Non-Commercial-No Derivative Works 2.0 UK: England & Wales Licence.  All reproductions must comply with the terms of that licence. The HEA logo is owned by the Higher Education Academy Limited may be freely distributed and copied for educational purposes only, provided that appropriate acknowledgement is given to the Higher Education Academy as the copyright holder and original publisher. The name and logo of University of Wales Newport is a trade mark and all rights in it are reserved.  The name and logo should not be reproduced without the express authorisation of the University.

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Amplifier Compensation

  • 1. Amplifier Compensation Electronic Engineering © University of Wales Newport 2009 This work is licensed under a Creative Commons Attribution 2.0 License .
  • 2.
  • 3.
  • 4.
  • 5. Frequency Gain dB gain Phase 100 99.80 39.98 -3.60 200 99.22 39.93 -7.16 400 96.98 39.73 -14.11 700 91.54 39.23 -23.74 1000 84.67 38.55 -32.14 2000 62.26 35.88 -51.49 4000 36.97 31.36 -68.30 7000 22.17 26.91 -77.18 10000 15.72 23.93 -80.95 20000 7.93 17.99 -85.44 40000 3.98 11.99 -87.71 70000 2.27 7.13 -88.69 100000 1.59 4.03 -89.08 200000 0.80 -1.99 -89.53 400000 0.40 -8.01 -89.76 700000 0.23 -12.87 -89.86 1000000 0.16 -15.96 -89.90
  • 6.  
  • 7.
  • 8.
  • 9.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15. Straight line up to 15 kHz at 89.5 dB Straight line from this point at -20 dB/dec up to 300 kHz x Now from this point the line rolls off at -40 dB/dec x Gain Curve f C1 f C2
  • 16. Gain Curve f C1 f C2 Now the phase curve Effect of f C1 Effect of f C2 Line at 0 ° up to 1/10 f C1 Now a line at -45 °/dec up to 1/10 f C2 x Now a line at -90 °/dec up to 10 f C1 x Now a line at -45 °/dec up to 10 f C2 x Line at -180 ° above 10 f C2 Phase Curve
  • 17.
  • 18.
  • 19.
  • 20.
  • 21. Gain Curve f C1 f C2 Phase Curve
  • 22.
  • 23. Gain Curve f C1 f C2 Phase Curve
  • 24.
  • 25.
  • 26.
  • 27.
  • 28. Gain Curve f C1 f C2 Phase Curve -20dB/dec -40dB/dec
  • 29.
  • 30. Amplifier Compensation This resource was created by the University of Wales Newport and released as an open educational resource through the Open Engineering Resources project of the HE Academy Engineering Subject Centre. The Open Engineering Resources project was funded by HEFCE and part of the JISC/HE Academy UKOER programme. © 2009 University of Wales Newport This work is licensed under a Creative Commons Attribution 2.0 License . The JISC logo is licensed under the terms of the Creative Commons Attribution-Non-Commercial-No Derivative Works 2.0 UK: England & Wales Licence.  All reproductions must comply with the terms of that licence. The HEA logo is owned by the Higher Education Academy Limited may be freely distributed and copied for educational purposes only, provided that appropriate acknowledgement is given to the Higher Education Academy as the copyright holder and original publisher. The name and logo of University of Wales Newport is a trade mark and all rights in it are reserved. The name and logo should not be reproduced without the express authorisation of the University.