Phone: (800) SMI-MMIC

http://www.sirenza.com

8

522 Almanor Ave., Sunnyvale, CA 94085

EDS-101157 Rev G

SXT-289 1800-2500 MHz Power Amplifier

Active Current Feedback Bias Circuit (for 5V supply)

Schematic

Evaluation Board Layout

Note: Circuit Optimized for Output IP3

y

c

n

e

u

q

e

r

Fz

H

M

0

6

9

1z

H

M

0

4

1

2z

H

M

0

5

4

2

)

B

d

(

n

i

a

G

l

a

n

g

i

S

ll

a

m

S3

.

5

10

.

5

16

.

4

1

)

m

B

d

(

3

P

I

t

u

p

t

u

O*

7

.

9

3*

2

.

9

3*

7

.

9

3

)

m

B

d

(

B

d

1

P8

.

3

20

.

3

27

.

3

2

NOTE: Reference Application Note AN-026 for more information on Active Current Bias Circuit.

Z=50

Ω,EL2

C7

5

6

4

3

2

1

Vs = 5V

C4

C5

C3

Rbias

L1

C1

R3

R2

R1

SXT-289

Z=50

Ω,EL1

C6

C2

U1

C5

C4

C3

U1

C1

C7

L1

Rbias

R2

R3

R1

1

C2

SXT-289

1

2

3

C6

Sirenza Microdevices

ECB-101872 Rev. B

SOT-89 Active Bias

Eval Board

*Note: IP3 performance degraded due to lower

(4.5V) device voltage.

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s

e

D

.

f

e

Rz

H

M

0

6

9

1z

H

M

0

4

1

2z

H

M

0

5

4

2r

e

b

m

u

N

t

r

a

P

7

C

,

1

CF

p

9

3F

p

9

3F

p

9

3

s

e

ir

e

s

8

1

H

C

M

m

h

o

R

2

CF

p

5

.

0-

-

s

e

ir

e

s

8

1

H

C

M

m

h

o

R

3

CF

u

1

.

0F

u

1

.

0F

u

1

.

0

K

4

0

1

2

0

5

3

M

7

6

2

o

u

s

t

a

M

4

CF

p

0

0

0

1F

p

0

0

0

1F

p

0

0

0

1

s

e

ir

e

s

8

1

H

C

M

m

h

o

R

5

CF

p

2

2F

p

2

2F

p

2

2

s

e

ir

e

s

8

1

H

C

M

m

h

o

R

6

CF

p

0

.

1F

p

0

.

1F

p

0

.

1

s

e

ir

e

s

8

1

H

C

M

m

h

o

R

n

o

it

i

s

o

P

6

C1

2

3

1

LH

n

5

1H

n

5

1H

n

5

1

s

e

ir

e

s

S

F

-

8

0

6

1

L

L

o

k

o

T

1

Rm

h

O

0

2

2m

h

O

0

2

2m

h

O

0

2

2

s

e

ir

e

s

3

0

R

C

M

m

h

o

R

2

Rm

h

O

K

8

.

1m

h

O

K

8

.

1m

h

O

K

8

.

1

s

e

ir

e

s

3

0

R

C

M

m

h

o

R

3

Rm

h

O

0

5

7m

h

O

0

5

7m

h

O

0

5

7

s

e

ir

e

s

3

0

R

C

M

m

h

o

R

s

a

i

b

Rm

h

O

3

.

4m

h

O

3

.

4m

h

O

3

.

4

s

e

ir

e

s

3

0

R

C

M

m

h

o

R

1

UN

1

Z

M

UN

1

Z

M

UN

1

Z

M

U

m

h

o

R

1

L

E°

5

.

3

1-

-

2

L

E°

5

.

5

3°

8

.

9

4°

9

.

0

4