Part B – The Transistor at high frequency

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Presentation transcript:

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

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

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

The MOS

Practical considerations using the simplified general model

Practical considerations using the simplified general model

Practical considerations using the simplified general model

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

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

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

Exercize

Considerations on the Frequency Response of Amplifiers

Considerations on the Frequency Response of Amplifiers

Considerations on the Frequency Response of Amplifiers