Specifications and information are subject to change without notice

WJ Communications, Inc

• Phone 1-800-WJ1-4401 • FAX: 408-577-6621 • e-mail: sales@wj.com • Web site: www.wj.com

November 2003

The Communications Edge

TM

AH103

High Gain, High Linearity ½ Watt Amplifier

Product Information

Application Circuit

Notes:

1.

DNP = Do not place this component.

2.

Distance “D1” measured from U1, pin 4 to edge of Cx (where x = 2, 3, or 4).

a.

D1 = 0.620” to C2 (for use with AH103-PCB1750)

The 2.0 pF input tuning capacitor is placed .045” to the left of “C2” shown on the silk

screen. The shunt capacitor is placed directly on the right and adjacent to the input

blocking capacitor C1.

b.

D1 = 0.450” to C3 (for use with AH103-PCB1900)

c.

D1 = 0.310” to C4 (for use with AH103-PCB2140)

3.

A voltage regulator is used in this circuit (U2) to drop the +9 V to a +5 V usable supply for the first

internal amplifier. It is permissible to remove the regulator and operate the 1

directly off of +5 V supply onto Test Point 1 (TP1). The use of a +5 V supply on the 1

stage requires a dropping resistor of 6.8

Ω.

4.

A +4.5 V supply can also be used to bypass the 6.8

Ω and can be applied to Test Point 2 (TP2).

Evaluation Board PCB Layout

Circuit Board Material: .014” FR-4, 4 layers, .062” total thickness

Bill of Materials

All Application Circuits

Ref. Desig.

Component

R1

6.8

Ω chip resistor

L2, L3

18 nH chip inductor

C6, C10, C12

.018

µF chip capacitor

U1

WJ AH103 Amplifier

U2

+5V Regulator,

National Semiconductor

NJM78L05

5. All components are of size 0603.

for the frequency band of interest.

AH103-PCB900

700 – 1000 MHz App. Circuit

Ref. Desig.

Component

L1

10 nH chip inductor

L4

5.6 nH chip inductor

C1

0

Ω chip resistor

C5, C11

5.6 pF chip capacitor

C7

10 pF chip capacitor

C9

1.5 pF chip capacitor

C2, C3, C4, C8

DNP

AH103-PCB1750

1700 – 1800 MHz App. Circuit

Ref. Desig.

Component

C1, C11

47 pF chip capacitor

C2

2.0 pF chip capacitor

C5

0

Ω chip resistor

C8

10 pF chip capacitor

C3, C4, C7

C9, L1, L4

DNP

See note (2a) for the proper placement of C2.

AH103-PCB1900

1800 – 2000 MHz App. Circuit

Ref. Desig.

Component

C1, C11

47 pF chip capacitor

C3

1.5 pF chip capacitor

C5

0

Ω chip resistor

C8

10 pF chip capacitor

C2, C4, C7

C9, L1, L4

DNP

AH103-PCB2140

2110 – 2140 MHz App. Circuit

Ref. Desig.

Component

C1, C11

47 pF chip capacitor

C4

1.2 pF chip capacitor

C5

0

Ω chip resistor

C8

10 pF chip capacitor

C2, C3. C7

C9, L1, L4

DNP

2.4 – 2.7 GHz Reference Circuit

Ref. Desig.

Component

L1

1 pF chip capacitor

C1

0

Ω chip resistor

C5

22 pF chip capacitor

C8

10 pF chip capacitor

C11

47 pF chip capacitor

C2, C3. C4

C7, C9, L4

DNP