1. Part B – The Transistor at high frequency
Frequency Response.
Part B – The Transistor at high frequency
Slides taken from:
A.R. Hambley, Electronics, © Prentice Hall, 2/e, 2000
D.A. Neamen, Microelectronics, © McGraw-Hill, 3/e, 2007

2. Outline Transistor models at high frequency Miller Effect
Amplifiers Frequency Response
Amplifiers High Frequency Response
Amplifiers Low Frequency Response

3. A general small signal transistor model
General Model
MOS model
rx1 ri Ci
Cgs Cf
Cgd ro Co
Cds
rx2 rd ry rs

4. The MOS

5. Practical considerations using the simplified general model

6. Practical considerations using the simplified general model

7. Practical considerations using the simplified general model

8. Miller Effect and Approximation
Figure 8.24a A feedback impedance can be replaced by impedances in parallel
with the input and output terminals.

9. Miller Effect and Approximation
Figure 8.24b A feedback impedance can be replaced by impedances
in parallel with the input and output terminals.

10. Figure 8.18 High-frequency FET equivalent circuit.
MOS at high frequency
Figure High-frequency FET equivalent circuit.

11. Exercize

12. Considerations on the Frequency Response of Amplifiers

13. Considerations on the Frequency Response of Amplifiers

14. Considerations on the Frequency Response of Amplifiers