The document discusses analog circuit design and transistor behavior at high frequencies. It covers transistor models at high frequency, the Miller effect, amplifiers' frequency response, and practical considerations for using simplified transistor models. Diagrams are included showing high-frequency transistor equivalent circuits and how feedback impedances can be modeled as parallel impedances at the input and output terminals, known as the Miller approximation.

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ELECTRONICS & COMMUNICATIONELECTRONICS & COMMUNICATION
SUB:ANALOG CIRCUIT DESIGN
2nd
year (4th
sem)

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ENROLLMENT NO. : NAME:
140330111001 AMETA KRUSHNAKANT G.
140330111009 POTTBATNI SANJAY A.
140330111012 YAGNIK GAGAN R.
Guided by: Mr.Kaushik Patel

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Transistor at High FrequencyTransistor at High Frequency

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

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General Model MOS model
rx1 0
ri ∞
Ci Cgs
Cf Cgd
ro ro
Co Cds
rx2 rd
ry rs

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Practical considerations using the
simplified general model

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

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

12. 12Figure 8.18 High-frequency FET equivalent circuit.
MOS at high frequency

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