Exercises for Cascode Amplifiers. ECE 102, Fall 2012, F. Najmabadi

Transcription

1 Execises f Cascde plifies ECE 0, Fall 0, F. Najabadi

2 F. Najabadi, ECE0, Fall 0 /6 Execise : Cpute assue and Eey Cascde stae inceases by uble Cascde

3 Execise : Cpute all indicated s, s, and i s. ssue tansists ae identical. S&S Pble 7. F. Najabadi, ECE0, Fall 0 /6

4 F. Najabadi, ECE0, Fall 0 /6

5 F. Najabadi, ECE0, Fall 0 /6 F peius slide: CS aplifie: 0. i i i i

6 F peius slide: Cascde aplifie we can use cascde ain t find siple ethd: i i 0. i i i i F. Najabadi, ECE0, Fall 0 6/6

7 F peius slide: Q is NOT an ap cnfiuatin t is a pat f the actie lad! i i 0. i i i i F. Najabadi, ECE0, Fall 0 7/6

8 i Cuents ae the sae! i i Lkin int dain f Q Lkin int dain f Q, is inceased by Lkin int suce f Q, is deceased by F. Najabadi, ECE0, Fall 0 8/6

9 CS p with a lad f Q inceased and Q deceased by the sae aunt leadin t Bad cicuit Cascde p with a pactical lad Gd cicuit 0. i 0. i F. Najabadi, ECE0, Fall 0 9/6

10 Output is NOT taken acss the lad B cicuit Q is NOT an p input at the dain CG p input at the suce Output at the dain CS p input at the ate Output at the dain F. Najabadi, ECE0, Fall 0 0/6 0. i 0. i

11 Execise : ue t anufactuin e, the input teinal f a cascde aplifie is is-cnfiued as is shwn. Cpute. ssue identical tansists ae identical. F. Najabadi, ECE0, Fall 0 /6

12 F peius Pble: S This is a CG cnfiuatin F. Najabadi, ECE0, Fall 0 /6

13 S F peius pble: Q des nt affect the ain, but it chanes the input esistance t: i S 0. F. Najabadi, ECE0, Fall 0 /6 Execise: Cpute answe:

14 Execise : ue t anufactuin e, a paasitic esistance has appeaed between dain and suce f Q. Cpute. ssue identical tansists ae identical. F. Najabadi, ECE0, Fall 0 /6

15 F peius Pble: Q: CG cnfiuatin: Q: CS cnfiuatin: p p F. Najabadi, ECE0, Fall 0 /6 p

16 When a esist is placed between ain and Suce f a tansist, thee is a siple and e eleant way t sle the sinal cicuit F. Najabadi, ECE0, Fall 0 6/6

17 p F. Najabadi, ECE0, Fall 0 7/6

18 Execise : ue t anufactuin e, a paasitic esistance has appeaed n the cicuit. Cpute. ssue identical tansists ae identical. F. Najabadi, ECE0, Fall 0 8/6

19 F. Najabadi, ECE0, Fall 0 9/6 p p Q: CG cnfiuatin: Q: CS cnfiuatin: p p

20 Execise 6: Find the pen-lp ain, eall ain and utput esistance f the cicuit if O 0. and L 00 k µ n C x 00 µ/, µ p C x 0 µ/, tp 0.6, λ n 0. /, λ p 0./ and W/L 0/0.8 f all tansists. W 6 0. ncx O L 0.8 µ 0 final P O O 0. W 0 µ C p x O O L 0.8 O 0.6 O O 0.6 F. Najabadi, ECE0, Fall 0 0/6

21 Peius pae: 0. & O O O O 0.6 O / λ 0. 0 n 0 k O / λ 0. 0 p k F Eleentay fs: k 687 k We need nly t cpute tw f,, and set as they ae elated: L We calculate all thee belw t L shw the ethd. Nte: Cascde p fula ies F. Najabadi, ECE0, Fall 0 /6

22 F Peius pae: 9. k, 687 k, L 00 k /, 0 k,. 0 /, k 9. k 687 k 8. k L Q CG: L L L 0k 8.k 8.9k L i : 00k 9.k 8.k. L L L 9.k 0k 9.k 9.0k 60. L L 9. k 00 k 8. k 9. k i Q CS: 0.86 k i. k esistance in the dain f Q i.9 i F. Najabadi, ECE0, Fall 0 /6 Execise: Shw L L

23 Execise 7: n the flded cascde cicuit belw, all tansists hae the sae µc x W/L, the sae λ and. Find the ain and the utput esistance f the aplifie in tes f and nly. F. Najabadi, ECE0, Fall 0 /6

24 F. Najabadi, ECE0, Fall 0 /6 Bias Pble:, the sae µc x W/L, and the sae λ & KCL : & O O O O O O 0. O x L W µc O O O O λ λ λ λ

25 F. Najabadi, ECE0, Fall 0 /6 CS p CG p ] [ / i x Q CS: 0. ] 0. [ / L i x i L / i QCG: 0.,, Sinal

26 F. Najabadi, ECE0, Fall 0 6/6 0.,, : ssued 0. >>