- 65 -

()

Oscillation Frequency: 2.42.5GHz

Output Swing > 1Vpp

Phase Noise < 120dBc/Hz @ 1MHz offset

()

1.

2.

3. pss phase noise

()

Unix/Linux

()

4-1(a)

X H(s)(

) Y

- 66 -

H(s)

(a)

(b)

4-1(a)(b)

4-1(b)

4-1(a)(4-1)

)(1

)()()(

sHsH

sXsY

(4-1)

0 1)( 00 jsH

X

Barkhausens criteria

(1) Loop gain 10 jH (4-2)

(2) o0 0 jH o0 180 jH (4-3)

(4-2)

- 67 -

1 3

(4-2)

1

1

(4-2)

4-2

4-2

4-2

4-2

R1 R1 = R2

- 68 -

()()LC

4-3 n

tdk k Ak k

n

Barkhausens

criteria

4-3

f0

0

21 21f

ttt dndd (4-4)

1)()()( 00201 fAfAfA n (4-5)

LC

IC

IC LC

4-4

- 69 -

4-4

4-4 LC 4-5

4-5LC

- 70 -

(Voltage Controlled Oscillator,

VCO) 4-5

(Varactor) VCO ( 4-6)

4-6LC

(phase noise)

(LO)

4-7(a) VCO

4-7(b)

(c)

1Hz (

dBc/Hz)

tuneV

- 71 -

(a) (b)

4-7(a)(b)

4-8 4-8(a)

LO

VCO

(

4-8(b)) VCO

4-8(a) LO (b) LO

- 72 -

()

4-6 LC

schematic

() VCO

Analog Design Environment 4-9

Select Initial Condition Set VCO

OK

4-9

(transient) 3-9

Stop Time ,

- 73 -

4-10Select Initial Condition Set

4-11Choosing Analyses pss/pnoise

pss/pnoise pss 4-11 Beat

- 74 -

Frequency pnoise

Choosing Analyses Analysis pnoiseSweeptype(

relative)relative harmonics( 1)Frequency Sweep Range(

paper@1MHz phase noise

)Sweep Type( logarithmicnumber of steps

)Sidebands( Select from range

)output( voltage select Schematic positive output

node &negative output node) 4-11

Direct Plot Form 4-12

4-12Direct Plot Form pnoise

- 75 -

()

LC

4-13

4-14

- 76 -

4-15

4-16Tuning Range