ECENECENECENECEN 658:658:658:658: HomeworkHomeworkHomeworkHomework AssignmentAssignmentAssignmentAssignment Arunvenkatesh Alagappan622006377

Problem #1:

(a) Input impedance is infiniteIf the input is grounded the relationship between input and output noise can be represented as:

HzVSS

SAS

u

u

uout

/105.2100)5(

215

22

2

−×=⇒

=

=

µ

With generator resistance 100kΩ

HzASkSkf

RSkTRSAS

i

i

sisuout

/10499.2))100(1003001038.145.2(100)500(

))(4(

221

22322

22

−

−

×=⇒

+××××+=

++=

µ

(b) Input impedance is 100kΩIf the input is grounded, the input voltage noise Su remains unchanged.

HzVSS

SAS

u

u

uout

/105.2100)5(

215

22

2

−×=⇒

=

=

µ

Now, with generator resistance 100kΩ

HzASkSkf

RRSRR

RkTRSAS

i

i

sinisin

insuout

/10999.9))50(503001038.145.2(100)500(

))||(4(

221

22322

22

−

−

×=⇒

+××××+=

++

+=

µ