Question: The folded - cascode CG LNA below is designed to operate with low supply voltage. Each inductor is chosen to resonate with the total capacitance

The folded

-

cascode CG LNA below is designed to operate with low supply voltage. Each inductor is chosen to resonate with the total capacitance at its corresponding node at the freq. of interest, so

L_{B}

can be viewed as a resistance equal to

R_{B}, L_{1}

R_{1},

and

L_{2}

R_{2} .

Assume that

R_{s}

is matched to the input resistance of M

1

PMOS, and

R_{B} R_{S} .

Neglect channel

-

length modulation, body effect, and the noise due to flicker noises. Determine the noise figure of the LNA with respect to a source resistance

R_{s} .

Show details of each step of your derivation.

(

Hint: use Fig

. 2.53 (

)

page

56

for the input

-

referred noise voltage of CG stage.

)

The folded - cascode CG LNA below is designed to

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