1 Lecture 10 Frequency response. 2 topics Bode diagram BJT’s Frequency response MOSFET Frequency response.

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Presentation transcript:

1 Lecture 10 Frequency response

2 topics Bode diagram BJT’s Frequency response MOSFET Frequency response

3 Amplifier Magnitude:Phase: Magnitude: Phase: Steady-state response

4 dB (decibel)= Decimal + Bell Human hearing frequency zone : 10Hz~24kHz Most Sensitive frequency zone : 2kHz~5kHz

5 Decade : Octave : Logarithmic coordinate dB Log scale

6 Example(low pass)

7 Magnitude: Phase:

8

9

10 Example(high pass)

11 Magnitude: Phase:

12

13

14 The bandwidth represents the distance between the two points in the frequency domain where the signal is of the maximum signal strength.

15 BJT high frequency model Depletion capacitance Emitter-base capacitance = diffusion capacitance + Base-Emitter junction capacitance Splitting resistance (refinement the lumped-component circuit)

16 Low frequency ß 3-dB frequency

17 Unity-gain bandwidth

18 CE Amplifier

19 Parallel capacitors Series capacitors Midband amplitude Bandwidth

20 High frequency response: The effect of parallel capacitors

21 Miller multiplier

22 Example 5.18 Find the Midband gain and upper 3 dB frequency of CE amplifier. The parameters of Hybrid  model

23

24 Low frequency response: The effects of the series capacitors

25 Consider C C1

26 Consider C E

27 Consider C C2

28 dominant

29 Example 5.19 Find the C C1, C C2 and C E the CE amplifier of the example 5.18.

30 MOSFET high frequency model

31

32 High frequency response: The effect of parallel capacitors

33 Midband amplitude Bandwidth

34

35

36 Example 4.12 Find the Midband gain and upper 3 dB frequency of CS amplifier.

37 Low frequency response: The effects of the series capacitors

38

39

40 Example 4.13 Find the C C1, C C2 and C s the CS amplifier of the example 4.12.