WJ AG101 70 MHz IF Amplifier Application Note

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The Communications Edge TM
Application Note
Product Information
AG101 60-100 MHz Application Circuit
Summary:
The AG101 is listed on the datasheet as having a frequency bandwidth from 250 – 3000 MHz as a gain block. With
a simple L-C input matching network, the device can be optimized to work at frequencies as low as 60 MHz to be
used as an IF amplifier gain block. The circuit shown has been optimized for 70 MHz, but can be used between 60100 MHz. The inductors that were used as an RF choke and for the input match are of type: Toko LL1608-FSR18J.
VDD = +4.5 V
ID = 50 mA
Frequency
70 MHz
S21 - Gain
S11 - Input R. L.
S22 - Output R. L.
S12 - Isolation
Noise Figure
Bias Supply
16.3 dB
-17.1 dB
-15.6 dB
-20.0 dB
5.1 dB
4.5 V @ 50 mA
L2
180 nH
CIRCUIT SCHEMATIC
DC BIAS
C3
.018 µF
INPUT MATCH
RF IN
PIN 1
C1
.018 µF
L1
180 nH
RF OUT
PIN 3
AG101
C4
.018 µF
PIN 2,4
C2
5.6 pF
S-Parameters
Noise Figure
S21
S22
S12
Noise Figure (dB)
S11
8
7
6
5
4
3
30
50
70
90
110
130
150
Frequency (MHz)
WJ Communications, Inc • Phone 1-800-WJ1-4401 • FAX: 408-577-6620 • e-mail: [email protected] • Web site: www.wj.com
March 2002
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