6. Cascode Amplifiers and Cascode Current Mirrors
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1 6. Cascde plfes and Cascde Cuent Ms Seda & Sth Sec. 7 (MOS ptn (S&S 5 th Ed: Sec. 6 MOS ptn & ne fequency espnse ECE 0, Fall 0, F. Najabad
2 Cascde aplfe s a ppula buldn blck f ICs Cascde Cnfuatn CG stae Snal ccut: Cuent suce beces an pen ccut snal bas CS stae I I D D Cascde aplfe s a tw-stae, CS-CG cnfuatn F. Najabad, ECE0, Fall 0 (/7
3 Sall Snal Mdel f a Cascde plfe CG stae Sall Snal Mdel CS stae enthy analyss t fnd (and a cplcated equatn. Sple t cpute pen-lp an ( and. Tet bk ntduces G ethd t fnd (See S&S Sec. Hee wll fnd dectly f the sall snal del. Hwee, the slutn f and nsht nt Cascde aplfes ae best btaned usn fundaental MOS cnfuatns! Nte that and calculated hee ae eant t fnd and ude the chce f the acte lad. and shuld be e-calculated f a pactcal ccut (see sldes & 5 F. Najabad, ECE0, Fall 0 (/7
4 Open-p an f a Cascde aplfe (usn sall snal del F. Najabad, ECE0, Fall 0 (/7 ( ( Nde Vltae Methd: 0 Nde : 0 0 Nde : By KC aund Q Open p Gan (, 0:
5 Output esstance f a Cascde aplfe (usn sall snal del F. Najabad, ECE0, Fall 0 (5/7 ] [( ( : KV ( : KC : KV s s Set 0, attach a ltae suce, cpute, / s 0 s cuent suce beces pen ccut By KC aund Q Nte:
6 Gan f a Cascde plfe (usn MOS Fundaental Cnfuatns F. Najabad, ECE0, Fall 0 (6/7- ( / ( / ( ( / CG staes educes the lad seen by the CS stae by Cascde (snal ccut CG stae CS stae Nte: Open p Gan: (
7 Output esstance f a Cascde aplfe (f Eleentay fs F. Najabad, ECE0, Fall 0 (7/7 ( ( ( (
8 Cascde plfe needs a lae lad ( ( F splcty assue and (CG (CS ( ( ( 0.5 / Ma. Gan Pactcal Gan Sae an as a snle CS p. F cpasn, a tw-stae CS-aplfe (CS-CS has a an f 0.5 ( f and a an f ( f. Cascde aplfe needs a lae lad (. F. Najabad, ECE0, Fall 0 (8/7
9 Cascde aplfe needs a lae lad t et a hh an Cuent M Cascde Gan dd nt ncease cpaed t a CS aplfe. Ths s stll a useful ccut because f ts hh an-bandwdth (we see ths late. T et a hh an, 0.5(, we need t ncease the sall-snal esstance f the cuent t ( Cascde cuent F. Najabad, ECE0, Fall 0 (9/7
10 Cascde Cuent Identcal MOS: Sae µc and V t, & GS GS & GS GS ( W ( W / / ( W ( W / / Usually: (W/ (W/ and (W/ (W/ GS GS GS GS GS Q and Q ae always n satuatn Q and Q bth hae t be n satuatn f cuent t wk V DS > V GS V t V DS > V GS V t Staht fwad t shw I ( W / I ef ( W / Eecse: Shw that a snle cuent (n cascdn wks nly f V D > V OV V SS and a cascde cuent eques V D > V OV V SS F. Najabad, ECE0, Fall 0 (0/7
11 Sall snal esstance f a cascde cuent s qute lae ( F. Najabad, ECE0, Fall 0 (/7 Tansst nuben s dffeent n dffeent ccuts Be caeful n applyn fulas! It s best t use eleentay fs t fnd nstead f fula abe.
12 PMOS cascde cuent s sla t NMOS esn NMOS Cascde cuent PMOS Cascde cuent F. Najabad, ECE0, Fall 0 (/7
13 Cascde aplfe wth a cascde cuent /acte lad Bas Cascde cuent Snal Cascde aplfe I I I D D D D I F. Najabad, ECE0, Fall 0 (/7 Eecse: Daw the ccut f a PMOS cascde wth a cascde cuent (cascde cuent wuld be ade f NMOS.
14 Gan f a Cascde aplfe wth a cascde cuent /acte lad F. Najabad, ECE0, Fall 0 (/7 Cascde aplfe Cascde cuent ( / ( ( / Value f the sae and ( 0 Q (CG p ( Q (CS p
15 Output esstance f a Cascde aplfe wth a cascde cuent /acte lad Value f the sae and ( ( 0.5 F. Najabad, ECE0, Fall 0 (5/7
16 Why Cascde plfes ae ppula? Cascde p. 0.5 ( 0.5 Dawbacks: Whle ae sla, Cascde has a ey (MΩ leel. shuld be fllwed wth a CS CD stae (nfnte lad f cascde BJT cascdes ae nt useful. w ltae head (V DD acss MOS Flded cascdes sle ths. -stae CS p. 0.5( Benefts: Much bette hh-fequency espnse (hh an-bandwdth.* Sple basn. F. Najabad, ECE0, Fall 0 (6/7 * We wll see ths late n u dscussn f fequency espnse.
17 Flded Cascde nceases ltae ehead* Bas Snal CG stae I I I I I I NMOS CS stae Based wth I I CS stae PMOS CG stae Based wth I F. Najabad, ECE0, Fall 0 (7/7 * Flded cascde nly helps the ltae ehead ssue f dffeence aplfes (see S&S paes
Active Load. Reading S&S (5ed): Sec. 7.2 S&S (6ed): Sec. 8.2
cte La ean S&S (5e: Sec. 7. S&S (6e: Sec. 8. In nteate ccuts, t s ffcult t fabcate essts. Instea, aplfe cnfuatns typcally use acte las (.e. las ae w acte eces. Ths can be ne usn a cuent suce cnfuatn,.e.
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