AT-41532 Ver la hoja de datos (PDF) - HP => Agilent Technologies
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AT-41532 Datasheet PDF : 15 Pages
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11
AT-41532 Application
Information
The AT-41532 is described in a
low noise amplifier for use in the
800 to 900 MHz frequency range.
The amplifier is designed for use
with .032 inch thickness FR-4
printed circuit board material.
900 MHz LNA Design
The amplifier is designed for a
VCE of 5 volts and IC of 5 mA. and
a minimum power supply voltage
of 5.25 volts. Higher power supply
voltages will require an additional
resistance to be inserted at the
power supply terminal. The
amplifier schematic is shown in
Figure 16.
A component list is shown in
Figure 17. The artwork including
component placement is shown
in Figure 18.
C2
INPUT
L1 Q1 R6
Zo C1
L2
R1
C4 R2 R4
R3
C3 OUTPUT
L3 C4 Zo
R5
VCC = 5.25 V
C5
C1,C4 10 pF chip capacitor
C2 Open circuited stub – see
text
C3 2.7 pF chip capacitor
C5 1000 pF chip capacitor
L1 8 nH chip inductor
(Coilcraft 1008CS-080)
L2 Optional (see R1)
L3 15 nH chip inductor
(Coilcraft 1008CS-150)
Q1 Agilent
AT-41532 Silicon Bipolar
Transistor
R1 10K Ω chip resistor (may
want to substitute a
180 nH chip inductor and
50 Ω resistor for lower
noise figure , better low
freq stability, then
readjust R2)
R2 48 K Ω chip resistor
(adjust for rated Ic)
R3 3.32 K Ω chip resistor
R4 3.32 K Ω chip resistor
R5 51.1 Ω chip resistor
R6 1.1K Ω chip resistor (see
text)
Zo 50 Ω microstripline
Figure 17. Component Parts List.
Figure 16. Schematic Diagram.
AT-3XX32
AT-4XX32
IN
01/98 AJW
.062 FR-4
OUT
Vcc
Figure 18. 1X Artwork showing
Component Placement.
The input matching network uses
a series inductor for the noise
match. Some fine tuning for
lowest noise figure and improved
input VSWR can be accomplished
by adding capacitance at C2. The
shunt C is accomplished with an
open circuited stub while a chip
inductor is used for the series
element. The output impedance
matching network is a high pass
structure consisting of a series
capacitor and shunt inductor. A
resistor is paralleled across the
shunt inductor to enhance broad
band stability through 10 GHz.
Bias insertion is accomplished
through the use of the shunt
inductor appropriately bypassed.
Surface mount Coilcraft induc-
tors were chosen for their small
size.
Biasing
The bias network is designed for
a nominal power supply voltage
of 5.25 volts. Resistors R1 and R2
are used to adjust collector
current. Resistor R4 can be
attached to the junction of R5 and
C5 to improve bias point stability.
Performance
The measured gain of the com-
pleted amplifier is shown in
Figure 19. The gain varies
from 14 to 15 dB over the 800 to
900 MHz frequency range. Noise
figure versus frequency is shown
in Figure 20. Best performance
occurs at 850 MHz providing a
near 1 dB noise figure.
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