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HSMS-282K-TR2G Datasheet(PDF) 5 Page - Agilent(Hewlett-Packard)

Part # HSMS-282K-TR2G
Description  Surface Mount RF Schottky Barrier Diodes
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Manufacturer  HP [Agilent(Hewlett-Packard)]
Direct Link  http://www.home.agilent.com
Logo HP - Agilent(Hewlett-Packard)

HSMS-282K-TR2G Datasheet(HTML) 5 Page - Agilent(Hewlett-Packard)

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Applications Information
Product Selection
Agilent’s family of surface mount
Schottky diodes provide unique
solutions to many design prob-
lems. Each is optimized for
certain applications.
The first step in choosing the right
product is to select the diode type.
All of the products in the
HSMS-282x family use the same
diode chip – they differ only in
package configuration. The same
is true of the HSMS-280x, -281x,
285x, -286x and -270x families.
Each family has a different set of
characteristics, which can be
compared most easily by consult-
ing the SPICE parameters given
on each data sheet.
The HSMS-282x family has been
optimized for use in RF applica-
tions, such as
 DC biased small signal
detectors to 1.5 GHz.
 Biased or unbiased large
signal detectors (AGC or
power monitors) to 4 GHz.
 Mixers and frequency
multipliers to 6 GHz.
The other feature of the
HSMS-282x family is its
unit-to-unit and lot-to-lot consis-
tency. The silicon chip used in this
series has been designed to use
the fewest possible processing
steps to minimize variations in
diode characteristics. Statistical
data on the consistency of this
product, in terms of SPICE
parameters, is available from
Agilent.
For those applications requiring
very high breakdown voltage, use
the HSMS-280x family of diodes.
Turn to the HSMS-281x when you
need very low flicker noise. The
HSMS-285x is a family of zero bias
detector diodes for small signal
applications. For high frequency
detector or mixer applications,
use the HSMS-286x family. The
HSMS-270x is a series of specialty
diodes for ultra high speed
clipping and clamping in digital
circuits.
Schottky Barrier Diode Char-
acteristics
Stripped of its package, a
Schottky barrier diode chip
consists of a metal-semiconductor
barrier formed by deposition of a
metal layer on a semiconductor.
The most common of several
different types, the passivated
diode, is shown in Figure 10,
along with its equivalent circuit.
RS is the parasitic series resis-
tance of the diode, the sum of the
bondwire and leadframe resis-
tance, the resistance of the bulk
layer of silicon, etc. RF energy
coupled into RS is lost as heat—it
does not contribute to the recti-
fied output of the diode. CJ is
parasitic junction capacitance of
the diode, controlled by the thick-
ness of the epitaxial layer and the
diameter of the Schottky contact.
Rj is the junction resistance of the
diode, a function of the total
current flowing through it.
RS
Rj
Cj
;;
METAL
SCHOTTKY JUNCTION
PASSIVATION
PASSIVATION
N-TYPE OR P-TYPE EPI
LAYER
N-TYPE OR P-TYPE SILICON SUBSTRATE
CROSS-SECTION OF SCHOTTKY
BARRIER DIODE CHIP
EQUIVALENT
CIRCUIT
8.33 X 10-5 nT
Rj = –––––––––––– = RV – R s
IS + Ib
0.026
≈ ––––– at 25°C
IS + Ib
where
n = ideality factor (see table of
SPICE parameters)
T = temperature in
°K
IS = saturation current (see
table of SPICE parameters)
Ib = externally applied bias
current in amps
Rv = sum of junction and series
resistance, the slope of the
V-I curve
IS is a function of diode barrier
height, and can range from
picoamps for high barrier diodes
to as much as 5
µA for very low
barrier diodes.
The Height of the Schottky
Barrier
The current-voltage characteristic
of a Schottky barrier diode at
room temperature is described by
the following equation:
V - IRS
I = IS (e
–––––
– 1)
0.026
On a semi-log plot (as shown in
the Agilent catalog) the current
graph will be a straight line with
inverse slope 2.3 X 0.026 = 0.060
volts per cycle (until the effect of
Figure 10. Schottky Diode Chip.


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