ECE 342 Electronic Circuits. Lecture 25 Frequency Response of CG, CB,SF and EF

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1 ECE 342 Electronic Circuits ecture 25 Frequency esponse of CG, CB,SF and EF Jose E. Schutt-Aine Electrical & Computer Engineering University of Illinois ECE 342 Jose Schutt Aine 1

2 Common Gate Amplifier Substrate is not connected to the source must account for body effect Drain signal current becomes i g v g v D m gs mb bs And since vgs v bs Body effect is fully accounted for by using g m g m g mb ECE 342 Jose Schutt Aine 2

3 Common Gate Amplifier i g g v i i m mb i ro i ro with v i v s 1 g g v m mb i vi vo vi i r i o ii ro ro 1 r ECE 342 Jose Schutt Aine 3 o

4 IC - Common Gate Amplifier in vi ro i 1 g g r i m mb o r 1, g g As o in m mb If, i v g g rv v o m mb o i i A 1 g g r vo m mb o ECE 342 Jose Schutt Aine 4

5 IC - Common Gate Amplifier ro 1, where A g g r A g g A in o m mb o vo m mb o Taking r o into account adds a component ( /A o ) to the input resistance. The open circuit voltage gain is: A 1 g g r vo m mb o The voltage gain of the loaded CG amplifier is: G v A vo r A o vo s ECE 342 Jose Schutt Aine 5

6 CG Output esistance vx ix gm gmb vro v with v ixs or r 1 g g r r A out o m mb o s out o vo s ECE 342 Jose Schutt Aine 6

7 CG Amplifier as Current Buffer s Gis Gvo 1 out G is is the short circuit current gain ECE 342 Jose Schutt Aine 7

8 High-Frequency esponse of CG - Include C to represent capacitance of load C gd is grounded No Miller effect ECE 342 Jose Schutt Aine 8

9 2 poles: High-Frequency esponse of CG f P1 f P2 2 Cgs s 1 1 g m 2 C C gd 1 g mb f P2 is usually lower than f p1 f P2 can be dominant Both f P1 and f P2 are usually much higher than f P in CS case ECE 342 Jose Schutt Aine 9

10 Common Base (CB) Amplifier ECE 342 Jose Schutt Aine 10

11 CB Amplifier in r r o o 1 r e 1 r e A 1 g r r e vo r 1 m o r 1g r out o m o e r e e ECE 342 Jose Schutt Aine 11

12 High-Frequency Analysis of CB Amplifier Exact analysis is too tedious approximate From current gain analysis 1 in3db rx r C S E out 3dB C The amplifier s upper cutoff frequency will be the lower of these two poles. ECE 342 Jose Schutt Aine 12

13 Source Follower r 1 o gmb v g v o m gs ECE 342 Jose Schutt Aine 13

14 v v v gs i o Source Follower A v v g v o m i 1 gm A vo gmro 1 g g r m mb o A vo gm 1 g g 1 m mb ECE 342 Jose Schutt Aine 14

15 Source Follower Output esistance o g m 1 g mb ro 1/ 1 o g m ECE 342 Jose Schutt Aine 15

16 Frequency esponse of Source Follower Determine location of transmission zeros Use method of open circuit time constants to estimate 3 db frequency ECE 342 Jose Schutt Aine 16

17 Determination of Zeros Three capacitances form a continuous loop Two transmission zeros Z g m Z fz ft Cgs ECE 342 Jose Schutt Aine 17

18 gs gd sig sig 1 Determination of Poles m g C o 1 f 1/2 C C C H gd gd gs gs C H 2 The source follower has excellent high-frequency response ECE 342 Jose Schutt Aine 18

19 Emitter Follower ECE 342 Jose Schutt Aine 19

20 Emitter Follower ECE 342 Jose Schutt Aine 20

21 Emitter Follower High-Frequency Exact analysis is too tedious approximate g A(s) 1 sc g m m v 1 gm sc 1 E 1 gme 3dB 1 gme gm C C C E T ECE 342 Jose Schutt Aine 21

22 High-Frequency Analysis of Emitter Follower gv m V sc Z r 0 leads to: g m (1 / r ) 1 C C r e Z 1 Cr e ECE 342 Jose Schutt Aine 22

23 High-Frequency Analysis of Emitter Follower 1 sig r 1 sig sig r r e fh 1/2 C C ECE 342 Jose Schutt Aine 23

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