Electronics BE CMOS Module3 Lec19-28

7/25/2019 Electronics BE CMOS Module3 Lec19-28

http://slidepdf.com/reader/full/electronics-be-cmos-module3-lec19-28 1/58

CMOS VLSI DESIGN

Module No 3: Diferential Ampliers

Faculty Name : Sthuthi Rachel Joshua, Sushma Kodagali



Diferential Ampliers

Lecture 19 – Diferential m!li"er#on"gurations: Single ended anddiferential o!eration

$

Lecture %& – #on"gurations, Single endedand diferential o!eration

11

Lecture %1– 'asic diferential !air 1(

Lecture %%– #ommon)mode res!onse indiferential am!li"er

19

Lecture %$– Diferential !air *ith +Sloads

%9

Lecture %- – Diferential !air *ith +Sloads

$-

Lecture %.– /il0ert cell $Lecture %(– /il0ert cell --

Lecture %2– Fre3uency res!onse and noisein diferential !air

-

Lecture % –Numerical 4ro0lems ondiferential am!li"er

.%

+odule $ 5nde6%



Single ended and

diferential operation

Leture No! "#



Diferential Amplier Conguration: Single Ended andDiferential Operation

+odule $ Lecture 19 Diferential m!li"er #on"guration: Single 7nded and Diferential !eration

-



Single Ended and Diferential Operation

.

4rere3uisites





(

4rere3uisites

/ain o8 m!

+a6imum s*ing o8 m!li"er is

oma6DD

omin in)th





2

4rere3uisites

/ain o8 m!li"er is





4rere3uisites





9

4rere3uisites





1&

4rere3uisites




Conguration$Single

ended and diferentialoperation

Leture No! %&




1% +odule $ Lecture %& Diferential m!li"er #on"guration: Single 7nded and Diferential !eration




1$

#orru!tion o8 Signal due to cou!ling

+odule $ Lecture %& Diferential m!li"er #on"guration: Single 7nded and Diferential !eration




1-

Efet o' Suppl( Noise





1.

)edution o' Coupled Noise




*asi Diferential +air

Leture No! %"




12


7fect o8 #ommon mode signal

+odule $ Lecture %1 'asic Diferential 4air




1

,uantitati-e Anal(sis o' Diferential Amplier

+odule $ Lecture %1 'asic Diferential 4air



Common Mode

)esponse inDiferential Amplier

Leture No! %%



Common Mode )esponse in Diferential Amplier

%&

Efet o' Common Mode Signal

+odule $ Lecture %% #ommon +odel Res!onse inDiferential m!li"er




%1

Efet Common Signal on Gain





%%

Ma.imum Allo/a0le Voltage S/ing

oma6DD and omini#+)th

;ence there is trade of 0et*een s*ing and gain





%$

Small Signal Anal(sis o' Diferential Amplier





%-


6 due to in1





%.






%(






%2

O-erall Voltage gain





%

E.ample




Diferential +air /it1

MOS Loads

Leture No! %3



Diferential +air /it1 MOS Loads

$&

Diferential +airs /it1 MOSLoads

Diferential 4air *ith diode connectedload

+odule $ Lecture %$ Diferential 4air *ith +S Loads




$1

Diferential 4air *ith #onstant currentsource load

Diferential +airs /it1 MOSLoads





$%

Modiation to inrease -oltagegain





$$

Casode diferential amplier




Diferential +air /it1

MOS Loads

Leture No! %2




$.

<he diferential !air =diferential am!li"er> con"guration?idely used 0uilding 0loc@ in analog integrated circuit design4er8ormance de!ends critically on the matching o8 the deAicesBtiliCes more com!onents than single)ended circuits?ell suited 8or 5# 8a0rication

dAantages o8 using diferential !airLess sensitiAe to noise and inter8erence than single)ended circuits'ias is !roAided *ithout the need 8or 0y!ass and cou!ling ca!acitors

+odule $ Lecture %- Diferential 4air *ith +S Loads




$(

1e Diferential Amplier /it1 Ati-e Load

Diferential to single)ended conAersionDiferential !air *ith diferential out!ut5m!roAed #+RR: su!!ress the inuence o8 the common)modeinter8erence

;igher Aoltage gain: gain is increased 0y a 8actor or %EDiferential !air *ith single)ended out!ut#ertain a!!lications re3uire single)ended out!ut resistiAe load diferential !air can sim!ly !roAide the diferential tosingle)ended conAersion <he actiAe)loaded +S diferential !airBtiliCes a current mirror = $ and -> as the actiAe load4roAides single)ended out!ut 8or the diferential !air

+odule $ Lecture %- Diferential 4air *ith +S Loads




$2 +odule $ Lecture %- Diferential 4air *ith +S Loads



Gil0ert Cell

Leture No! %4



Gil0ert Cell

$9

Gil0ert multiplier ell

<he /il0ert multi!lier cell is the 0asis 8or most integrated circuit0alanced multi!lier systemsE

<he series connection o8 an emitter)cou!led !air *ith t*o cross)cou!led, emitter)cou!led !airs !roduces a !articularly use8ultrans8er characteristicE

+odule $ Lecture %. /il0ert #ell



Gil0ert Cell

-&

Gil0ert ell 5 DC Anal(sis

Su0stituting 5c1 and 5c% in e6!ressions 8or

<he t*o currents 5c1 and 5c% are related to %

5c$ , 5c-, 5c. and 5c( get :




Gil0ert Cell

-1 +odule $ Lecture %. /il0ert #ell



Gil0ert Cell

-%

<he diferential out!ut current is then giAen 0y

Similar:




Gil0ert Cell

-$

<he diferential out!ut current is then giAen 0y

?here

Finally




Gil0ert Cell

Leture No! %6



Gil0ert Cell

-.

Gil0ert ell Appliations

=%>58 one o8 the in!uts o8 a signal that is large com!ared to <, thisefectiAely multi!lies the a!!lied small signal 0y a s3uare *aAe, and actsas a modulatorE

=$> 58 0oth in!uts are large com!ared to <, and all si6 transistors in thecircuit 0ehaAe as non)saturating s*itchesE <his is use8ul 8or the detection

o8 !hase diferences 0et*een t*o am!litude)limited signals, as isre3uired in !hase)loc@ed loo!s, and is sometimes called the !hase)detector modeE

and it *o@s as multi!lier58

+odule $ Lecture %( /il0ert #ell



Gil0ert Cell

-(

Gil0ert ell as Multiplier

<hus 8or small)am!litude signals, the circuit !er8orms an analogmulti!licationE Bn8ortunately, the am!litudes o8 the in!ut signals are o8tenmuch larger than <E

n alternate a!!roach is to introduce a nonlinearity that !redictors thein!ut signals to com!ensate 8or the hy!er0olic tangent trans8ercharacteristic o8 the 0asic cellE

<he re3uired nonlinearity is an inAerse hy!er0olic tangent characteristic

+odule $ Lecture %( /il0ert #ell



Gil0ert Cell

-2 +odule $ Lecture %( /il0ert #ell



7re8uen( )esponse

and Noise inDiferential +air

Leture No! %9



-9 +odule $ Lecture %2 Fre3uency Res!onse and Noise inDiferential 4air

7re8uen( )esponse and Noise in Diferential +air

;igh)4ass Filter Res!onse

12

1

2

1

2

1

11

+

=

ω

ω

C R

C R

V

V

in

out

<he Aoltage diAision 0et*een a resistor and aca!acitor can 0e con"gured such that the gain atlo* 8re3uency is reducedE



.& +odule $ Lecture %2 Fre3uency Res!onse and Noise inDiferential 4air


(pial 7re8uen( )esponse



.1 +odule $ Lecture %2 Fre3uency Res!onse and Noise inDiferential 4air


ig157re8uen( *ipolar Model

b jeC C C π

= +

t high 8re3uency, ca!acitiAe efects come into!layE #0 re!resents the 0ase charge, *hereas #

µ

and # Ge are the Gunction ca!acitancesE



Numerial pro0lems on

Diferential +air

Leture No! %;



Numerial

.$ +odule $ Lecture % Num0erical

76ercise 1: #om!ute D , S , DS and /S i8 5D$ % m, RD

.&& H, $ &E. , and identical 1 I% *ith n#o6 =?L > m% , t &E. , &E > For / & and '> For / 1 ERe!eat the e6ercise 8or &E1 )1E



Numerial

.- +odule $ Lecture % Num0erical



Numerial

.. +odule $ Lecture % Num0erical



Numerial

.( +odule $ Lecture % Num0erical



VIDEO <Diferential Amplier=

htt!:***Eyoutu0eEcom*atchMA&nSD&/9+Do

ideo.2

http://www.youtube.com/watch?v=08nSD0G9MDo

http://www.youtube.com/watch?v=08nSD0G9MDo



1an> ?ou

Electronics BE CMOS Module3 Lec19-28

Documents

Transcript of Electronics BE CMOS Module3 Lec19-28