- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄299520 > MSA-2743 100 MHz - 6000 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER PDF資料下載
參數(shù)資料
| 型號(hào)： | MSA-2743 |
| 元件分類： | 放大器 |
| 英文描述： | 100 MHz - 6000 MHz RF/MICROWAVE WIDE BAND LOW POWER AMPLIFIER |
| 封裝： | PLASTIC, SOT-343, SC70, 4 PIN |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 220K |
| 代理商： | MSA-2743 |
10
IN
OUT
Vcc
MSA-2X43
IP 4/00
Agilent Technologies
Figure 3. Multi-purpose Evaluation Board.
The amplifier and related com-
ponents are assembled onto the
printed circuit board as shown in
Figure 6. The MSA-2X43 circuit
board is designed to use edge-
mounting SMA connectors such as
Johnson Components, Inc., Model
142-0701-881. These connectors
are designed to slip over the edge
of 0.031-inch thick circuit boards
and obviate the need to mount
PCBs on a metal base plate for
testing. The center conductors of
the connectors are soldered to the
input and output microstrip lines.
The ground pins are soldered to
the ground plane on the back of
the board and to the top ground
pads.
DC blocking capacitors are re-
quired at the input and output of
the IC. The values of the blocking
capacitors are determined by the
lowest frequency of operation
for a particular application. The
capacitor’s reactance is chosen to
be 10% or less of the amplifier’s
input or output impedance at the
lowest operating frequency. For
example, an amplifier to be used
in an application covering the
900 MHz band would require an
input blocking capacitor of at least
39 pF, which is 4.5
Ω of reactance
at 900 MHz. The Vcc connection to
the amplifier must be RF bypassed
by placing a capacitor to ground at
the bias pad of the board. Like the
DC blocking capacitors, the value
of the Vcc bypass capacitor is
determined by the lowest operat-
ing frequency for the amplifier.
Space is available on the circuit
board to add a bias choke, bypass
capacitors, and collector resistors.
The MSA series of ICs requires
a bias resistor to ensure thermal
stability. The bias resistor value
is calculated from the operating
current value, device voltage and
the supply voltage; see equation
below. When applying bias to the
board, start at a low voltage level
and slowly increase the voltage
until the recommended current is
reached. Both power and gain can
be adjusted by varying I
d.
Rc = Vcc – V
d
Ω
I
d
Where:
Vcc = The power supply voltage
applied to Rc (volts)
V
d =
The device voltage (volts)
I
d =
The quiescent bias current
drawn by the device
Notes on Rc Selection
The value of Rc is dependant on
V
d, any production variation in Vd
will have an effect on I
d. As the
gain and power performance of
the MSA-2743 may be adjusted
by varying I
d this will have to be
taken into account. The char-
acterization data in section one
shows the relationship between
V
d and Id over temperature. At
lower temperatures the value of
V
d increases. The increase in Vd at
low temperatures and production
variations may cause potential
problems for the amplifier per-
formance if it is not taken into
account. One solution would be
to increase the voltage supply to
have at least a 4V drop across the
bias resistor Rc. This will guar-
antee good temperature stability.
Table 1 shows the effects of Rc on
the performance of the MSA-2743
over temperature.
An alternative solution to ensure
good temperature stability with-
out having a large voltage drop
across a resistor would be to use
an active bias circuit as shown
in Figure 4. The resistors R1 and
the PNP transistor connected to
form a diode by connecting the
base and collector together and
R2 form a potential diver circuit
to set the base voltage of the bias
PNP transistor. The diode con-
nected PNP transistor is used to
compensate for the voltage varia-
tion of the base-emitter junction
with temperature of the bias PNP
transistor. R3 provides a bleed
path for any excess bias; it is a
safety feature and can be omitted
Table 1. Effects of Rc on Performance over Temperature.
Device voltage = 3.9V nominally at 25°C.
Voltage
Resistor
Temperature,
Bias Current,
Power Gain @
Drop, volts
Value, Ohms
°C
mA
2.0 GHz, dB
0
41.8
15.
5
50.0
15.1
85
66.8
15.0
1.35
7
0
47.3
15.3
5
50.0
15.1
85
56.5
14.9
.35
47
0
47.8
15.
5
50.0
15.1
85
53.5
14.8
6.0
10
0
49.1
15.3
5
50.0
15.1
85
51.8
14.9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MSC1020 | 14 pin DIP, 5.0 Volt, HCMOS/TTL, Clock Oscillator |
| MSC1150M | 14 pin DIP, 5.0 Volt, HCMOS/TTL, Clock Oscillator |
| MSC1356-01 | QUARTZ CRYSTAL RESONATOR, 6.312 MHz |
| MSC26000013 | 26 CONTACT(S), MALE, STRAIGHT TELECOM AND DATACOM CONNECTOR, SURFACE MOUNT |
| MSC3005 | 14 pin DIP, 5.0 Volt, HCMOS/TTL, Clock Oscillator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MSA-2743-BLK | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Cascadable Silicon Bipolar Gain Block MMIC Amplifier |
| MSA-2743-TR1 | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Cascadable Silicon Bipolar Gain Block MMIC Amplifier |
| MSA-2743-TR2 | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Cascadable Silicon Bipolar Gain Block MMIC Amplifier |
| MSA28 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:MOLDED SSOP |
| MSA2805D | 制造商:CRANE 制造商全稱:CRANE 功能描述:DC/DC CONVERTERS 28 VOLT INPUT |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。