AT-32032 Datasheet, PDF (11/14 Pages) AVAGO TECHNOLOGIES LIMITED – Low Current, High Performance NPN Silicon Bipolar Transistor

AT-32032 Application Information
The AT-32032 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 V_ce of 2.7 volts and I_c of 5
mA. and a nominal power supply voltage of 3 volts. 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.
AT-3XX32
AT-4XX32
IN
02/98 AJW
.031 FR-4
OUT
C2
INPUT
L1 ^Q1
Z_o C1
L2
R6 L4
L3
R5
C3 OUTPUT
Z_o
R1
C4 R2 R4
V_CC = 3 V
C5
R3
Figure 16. Schematic Diagram.
C1,C3
C2
C4,C5
L1
L2
L3
L4
Q1 Silicon
R1
R2
R3
R4
R5
R6
Zo
10 pF chip capacitor
Open circuited stub .275 inch long
1000 pF chip capacitor
8 nH chip inductor (Coilcraft 1008CS-080)
Optional (see R1)
56 nH chip inductor (Coilcraft 1008CS-560)
15 nH chip inductor (Coilcraft 1008CS-150)
Agilent AT-32032 Bipolar Transistor
10 K Ω chip resistor (may want to substitute
a 180 nH chip inductor and 50 W resistor for
lower noise figure, better low freq stability,
the readjust R2)
26.1 K Ω chip resistor (adjust for rated Ic)
3.32 K Ω chip resistor
3.32 K Ω chip resistor
51.1 Ω chip resistor
13 Ω chip resistor (see text)
50 Ω microstripline
Vcc
Figure 18. 1X Artwork showing Component Placement.
The input matching network uses a shunt C series L input
impedance matching circuit for low noise. 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 consists of a series chip
inductor. Bias insertion is accomplished by the use of small
inductors suitably bypassed. A resistor is placed in series
with the output bias decoupling inductor to de-Q the
network and improve in-band and low frequency stability.
Surface mount Coilcraft inductors were chosen for their
small size. Resistor R6 enhances broad band stability
especially in the 9 to 10 GHz frequency range.
Biasing
The bias network is designed for a nominal power supply
voltage of 3 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.
Figure 17. Component Parts List.
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