ECG003
InGaP HBT Gain Block
Recommended Application Circuit
Vcc
Icc = 110 mA
R3
Bias
Resistor
C4
Bypass
Capacitor
C3
0.018 µF
L1
RF Choke
RF OUT
ECG003B
C1
Blocking
Capacitor
R1
18
Ω
R2
4.7
Ω
C2
Blocking
Capacitor
RF IN
Reference
Designator
L1
C1, C2, C3
50
820 nH
.018 µF
Recommended Component Values
Frequency (MHz)
500
900
1900
2200
220 nH
68 nH
27 nH
22 nH
1000 pF
100 pF
68 pF
68 pF
2500
18 nH
56 pF
3500
15 nH
39 pF
1. The proper values for the components are dependent upon the intended frequency of operation.
2. The component values in the table below are contained on the evaluation board to achieve optimal broadband
performance.
3. R1 and R2 are shown in the circuit diagram to avoid potential instabilities. The configuration shown above assures
of unconditional stability with the use of the device. It is expected that linearity parameters (OIP3 and P1dB) to
degrade about only 0.5 dB, while overall gain will be about 2 dB less than the performance shown in page 1 and 2 of
this datasheet. Input and output return loss is expected to improve with the use of the I/O series resistances at 2 GHz.
Recommended Bias Resistor Values
Supply
R3 value
Size
Voltage
9V
16 ohms
2010
10 V
25 ohms
2512
12 V
44 ohms
2512
The proper value for R3 is dependent upon the supply
voltage and allows for bias stability over temperature.
WJ recommends a minimum supply bias of +9 V. A
1% tolerance resistor is recommended.
Ref. Desig.
L1
C1, C2
C3
C4
R1
R2
R3
Value / Type
39 nH wirewound inductor
56 pF chip capacitor
0.018
µF
chip capacitor
Do Not Place
18
Ω
chip resistor
4.7
Ω
chip resistor
16
Ω
1% tolerance
Size
0603
0603
0603
0603
0603
2010
ECG003B-PCB Performance Data
(WJ’s evaluation board uses the circuit shown above.)
Gain
20
S11 & S22 (dB)
18
16
14
12
10
0
Return Loss
-10
-20
S11
-30
S22
0
1
2
Frequency (GHz)
3
4
0
1
2
3
4
Frequency (GHz)
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
Page 3 of 4
April 2007
WJCI [ WJ COMMUNICATION. INC. ]
