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參數(shù)資料
| 型號(hào)： | ATF-551M4-TR2 |
| 元件分類： | 小信號(hào)晶體管 |
| 英文描述： | X BAND, Si, N-CHANNEL, RF SMALL SIGNAL, HEMFET |
| 封裝： | 1.40 MM X 1.20 MM, 0.70 MM HEIGHT, MINIATURE, LEADLESS PACKAGE-4 |
| 文件頁(yè)數(shù)： | 10/23頁(yè) |
| 文件大?。?/td> | 406K |
| 代理商： | ATF-551M4-TR2 |
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1
S and Noise Parameter Measurements
The position of the reference planes used for the mea-
surement of both S and Noise Parameter measure-
ments is shown in Figure 36. The reference plane can be
described as being at the center of both the gate and
drain pads.
S and noise parameters are measured with a 50 ohm
microstrip test fixture made with a 0.010" thickness
aluminum substrate. Both source pads are connected
directly to ground via a 0.010" thickness metal rib
which provides a very low inductance path to ground
for both source pads. The inductance associated with
the addition of printed circuit board plated through
holes and source bypass capacitors must be added
to the computer circuit simulation to properly model
the effect of grounding the source leads in a typical
amplifier design.
Gate
Pin 2
Source
Pin 3
Drain
Pin 4
Source
Pin 1
Reference
Plane
Microstrip
Transmission Lines
Vx
Figure . Position of the Reference Planes.
Noise Parameter Applications Information
The Fmin values are based on a set of 16 noise figure
measurements made at 16 different impedances using
an ATN NP5 test system. From these measurements,
a true Fmin is calculated. Fmin represents the true
minimum noise figure of the device when the device is
presented with an impedance matching network that
transforms the source impedance, typically 50, to an
impedance represented by the reflection coefficient
Γ
o.
The designer must design a matching network that will
present
Γ
o to the device with minimal associated circuit
losses. The noise figure of the completed amplifier is
equal to the noise figure of the device plus the losses of
the matching network preceding the device. The noise
figure of the device is equal to Fmin only when the
device is presented with
Γ
o. If the reflection coefficient
of the matching network is other than
Γ
o, then the noise
figure of the device will be greater than Fmin based on
the following equation.
NF = F
min + 4 Rn
|
Γ
s – Γo |
2
Zo (|1 +
Γ
o|
2
)(1- |
Γ
s|
2
)
Where Rn/Zo is the normalized noise resistance,
Γ
o is
the optimum reflection coefficient required to produce
Fmin and
Γ
s is the reflection coefficient of the source
impedance actually presented to the device.
The losses of the matching networks are non-zero
and they will also add to the noise figure of the device
creating a higher amplifier noise figure. The losses of
the matching networks are related to the Q of the com-
ponents and associated printed circuit board loss.
Γ
o is
typically fairly low at higher frequencies and increases
as frequency is lowered. Larger gate width devices
will typically have a lower
Γ
o as compared to narrower
gate width devices. Typically for FETs , the higher
Γ
o
usually infers that an impedance much higher than
50 is required for the device to produce Fmin. At VHF
frequencies and even lower L Band frequencies, the
required impedance can be in the vicinity of several
thousand ohms. Matching to such a high impedance
requires very hi-Q components in order to minimize
circuit losses. As an example at 900 MHz, when air
wound coils (Q>100)are used for matching networks,
the loss can still be up to 0.25 dB which will add directly
to the noise figure of the device. Using muiltilayer
molded inductors with Qs in the 30 to 50 range results
in additional loss over the air wound coil. Losses as high
as 0.5 dB or greater add to the typical 0.15 dB Fmin of
the device creating an amplifier noise figure of nearly
0.65 dB.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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| ATF-58143-BLKG | 功能描述:射頻GaAs晶體管 Transistor GaAs Single Voltage RoHS:否 制造商:TriQuint Semiconductor 技術(shù)類型:pHEMT 頻率:500 MHz to 3 GHz 增益:10 dB 噪聲系數(shù): 正向跨導(dǎo) gFS（最大值/最小值）:4 S 漏源電壓 VDS: 閘/源擊穿電壓:- 8 V 漏極連續(xù)電流:3 A 最大工作溫度:+ 150 C 功率耗散:10 W 安裝風(fēng)格: 封裝 / 箱體: |
| ATF-58143-BLKG | 制造商:Avago Technologies 功能描述:RF Bipolar Transistor |
| ATF-58143-TR1 | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Low Noise Enhancement Mode Pseudomorphic HEMT in a Surface Mount Plastic Package |
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