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PDF SKY65050-372LF Data sheet ( Hoja de datos )
| Número de pieza | SKY65050-372LF | |
| Descripción | Low Noise Transistor | |
| Fabricantes | Skyworks Solutions | |
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data sheet
SKY65050-372LF: Low Noise Transistor
www.datasheet4u.com
Applications
l W ireless infrastructure: WLAN, WiMAX, broadband, cellular
base stations
l T est instrumentation
l L NA for GPS receiver
l S atellite receivers
Features
l 8 50–6000 MHz frequency of operation
l N oise figure of 0.4 dB at 2.4 GHz
l N oise figure of 0.4 dB at 2.0 GHz
l G ain of 14 dB at 2.4 GHz
l G ain of 16 dB at 2.0 GHz
l O IP3 of 20 dBm at 2.4 GHz
l P 1 dB of 8 dBm at 2.4 GHz
l S ingle DC supply
l O perating current of 16 mA
l S mall footprint 4-lead SC-70 package, lead (Pb)-free, RoHS-
compliant, and Green™
Description
The SKY65050-372LF is a high performance, low noise, n-channel,
depletion mode pHEMT, fabricated from Skyworks advanced
pHEMT process and packaged in a miniature 4-lead SC-70
package. The transistor’s low noise figure, high gain and excel-
lent third order intercept (IP3) allows this transistor to be used in
various receiver and transmitter applications.
The SKY65050-372LF is lead (Pb)-free, RoHS-compliant,
and Green™.
NEW Skyworks Green™ products are RoHS (Restriction
of Hazardous Substances)-compliant, conform to
the EIA/EICTA/JEITA Joint Industry Guide (JIG)
Level A guidelines, are halogen free according to
IEC-61249-2-21, and contain <1,000 ppm antimony
trioxide in polymeric materials.
Figure 1. Functional Block Diagram
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200967 Rev. B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 12, 2008
1
1 page  
Data Sheet • SKY65050-372LF
2.0 25.0
1.8 22.5
1.6 20.0
1.4 17.5
1.2 15.0
1.0
www.datasheet4u.com
0.8
12.5
10.0
0.6 7.5
0.4 5.0
0.2 2.5
00
0 10 20 30 40 50 60
Drain Current (mA)
Figure 13. Minimum Noise Figure and
associated Gain vs. Drain Current
Introduction
The SKY65050-372 is a depletion mode PHEMT designed for low
noise, high frequency applications. The SKY65050-372 has a
typical noise figure of 0.65 dB tested at the 2.4 GHz wireless
LAN frequency band. A gain of 14 dB typical is achieved using
the same circuit. If the frequency of operation is lowered to the
1 GHz range, noise figure performance of the device can
approach 0.5 dB.
De-embedded scattering and noise parameters are provided in
addition to typical circuit topologies for commonly used frequency
bands. With an appropriate circuit, the SKY65050-372 can be
used for any application from 850 MHz up to 6 GHz. The SC-70
4-lead package makes the SKY65050-372 an ideal low noise and
low cost solution.
Biasing
To properly bias a depletion mode PHEMT, both the gate and
drain of the device must be biased properly. At VGS = 0 V and VDS
> 2 V, the device is in its saturated state and will draw the max-
imum amount of current, IDSS. Typically, the device achieves the
best noise performance at VDS = 3 V and IDS = 15 mA. In order to
control IDS, VGS must be biased with a negative voltage supply.
To eliminate the need of a negative DC supply, self-biasing
should be used where a resistor is placed between one of the
source leads and ground. A bypass capacitor should be placed in
parallel to this resistor to provide a RF ground and to ensure per-
formance at the operating frequency remains unchanged. When
current flows from drain to source and through the resistor, the
source voltage becomes biased above DC ground. The gate pin
of the device should be left unbiased at 0 V, thus creating the
desired negative VGS value. This largely simplifies the design by
eliminating the need for a second DC supply. Table 2 contains
resistor values to bias the SKY65050-372 properly.
Table 2. Self-Bias Resistance
Resistor Value (W)
47
27
20
15
10
Drain Current (mA)
10
15
20
25
30
RF Matching Networks
The circuit schematic in Figure 14 shows the recommended RF
matching network used for the 2.4 GHz wireless LAN frequency
band. De-embedded s and noise parameters were used to design
this network. This circuit was primarily tuned for gain, noise figure,
and input and output return loss while maintaining proper stability.
Optimal noise performance is attained when the impedance
presented to the input of the amplifier is equal to its NFMIN
impedance point. Components C1, L1, and L2 provide the nec-
essary impedance match for noise figure and input return loss.
Circuit board and input matching structure losses on the input of
the amplifier add directly to the overall noise figure of the ampli-
fier. It is critical to minimize RF trace lengths and to use high Q
components to achieve optimal noise figure performance.
R1 and C2 provide self bias for the device as well as RF
grounding for one of the two source lead. C7 is placed on the
opposing source lead and is used to tune the transistor’s internal
source inductance. The effect of source inductance will vary with
frequency. Too little source inductance will increase gain and
high frequency stability, but at the cost of decreased in-band sta-
bility. Too much source inductance will decrease high frequency
stability and gain, but increase in-band stability. It is very impor-
tant to find the optimum tuning of source inductance that will
balance all of these variables.
The output matching topology is typical for a RF amplifier. L3
is the RF choke that prevents RF signals from reaching the
DC supply. C4 is the DC blocking capacitor. R2 is added for
increased stability at the expense of decreased output power.
This resistance can be increased from its nominal value of 180
to improve output power at the expense of broadband stability.
Figure 15 shows a recommended layout.
Application notes, device models, S-parameters, and noise
parameters are available at www.skyworksinc.com.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
200967 Rev. B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • November 12, 2008
5
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