EC1078
The Communications Edge
TM
Product Information
InGaP HBT Gain Block
Recommended Application Circuit (EC1078B-PCB)
Vcc
Icc = 96 mA
Bias
Resistor
C4
Bypass
Capacitor
C3
0.018 µF
L1
RF Choke
RF OUT
EC1078B
C1
Blocking
Capacitor
R1
6
Ω
R2
6
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 1 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
R bias value
Size
Voltage
7V
14.6 ohms
1210
8V
25 ohms
1210
9V
35 ohms
2010
10 V
46 ohms
2010
12 V
67 ohms
2512
The proper value for R bias is dependent upon the
supply voltage and allows for bias stability over
temperature. WJ recommends a minimum supply bias
of +7 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
6
Ω
chip resistor
6
Ω
chip resistor
14
Ω
1% tolerance
Size
0603
0603
0603
0603
0603
2010
Typical Device S-Parameters
S-Parameters (V
device
= +5.6 V, I
CC
= 96 mA, T = 25°C, calibrated to device leads)
Freq (MHz)
S11 (dB)
S11 (ang)
S21 (dB)
S21 (ang)
S12 (dB)
S12 (ang)
S22 (dB)
S22 (ang)
50
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
6000
-13.94
-13.75
-13.18
-12.31
-11.09
-9.97
-8.87
-7.79
-6.76
-5.72
-4.72
-3.91
-3.22
-3.83
-39.71
-77.85
-113.82
-148.03
-177.99
154.89
129.58
106.00
85.30
66.77
51.00
37.49
21.57
20.96
19.93
18.86
17.94
16.84
15.65
14.44
13.18
11.80
10.39
8.85
7.41
176.70
148.92
122.53
98.71
76.48
54.17
33.67
13.81
-5.36
-23.83
-41.03
-57.10
-71.74
-24.12
-23.37
-22.08
-20.68
-19.38
-18.50
-17.80
-17.41
-17.25
-17.22
-17.40
-17.84
-18.28
0.80
6.98
8.80
4.63
-1.93
-11.42
-21.55
-32.42
-43.17
-53.97
-64.41
-74.10
-83.92
-11.86
-11.69
-10.82
-9.54
-8.31
-7.34
-6.41
-5.63
-4.78
-4.07
-3.41
-2.93
-2.53
-4.93
-48.17
-90.17
-126.09
-158.11
173.96
148.41
125.43
105.05
86.50
70.24
56.07
43.40
Device S-parameters are available for download off of the website at: http://www.wj.com
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 2006
WJCI [ WJ COMMUNICATION. INC. ]
