DATA SHEET
Silicon Schottky Diode Chips
Features
For detector and mixer applications
G
Low capacitance for usage beyond 40 GHz
G
ZBD and low-barrier designs
G
P-type and N-type junctions
G
Large bond pad chip design
G
Available lead (Pb)-free, RoHS-compliant, and Green
G
Description
Skyworks silicon Schottky diode chips are intended for use
as detector and mixer devices in hybrid integrated circuits at
frequencies from below 100 MHz to higher than 40 GHz.
Skyworks “Universal Chip” design features a 4-mil-diameter
bond pad that is offset from the semiconductor junction
preventing damage to the active junction as a result of
wire bonding.
As power-sensing detectors, these Schottky diode chips all have
the same voltage sensitivity so long as the output video imped-
ance is much higher than the video resistance of the diode.
Figure 1 shows the expected detected voltage sensitivity as a
function of RF source impedance in an untuned circuit. Note that
sensitivity is substantially increased by transforming the source
impedance from 50
Ω
to higher values. Maximum sensitivity
occurs when the source impedance equals the video resistance.
In a detector circuit operating at zero bias, depending on the
video load impedance, a ZBD device with R
V
less than 10 kΩ
may be more sensitive than a low-barrier diode with R
V
greater
than 100 kΩ. Applying forward bias reduces the diode video
resistance as shown in Figure 2. Lower video resistance also
increases the video bandwidth but does not increase voltage
sensitivity, as shown in Figure 3. Biased Schottky diodes have
better temperature stability and also may be used in temperature
compensated detector circuits.
P-type Schottky diodes generate lower 1/F noise and are
preferred for Doppler mixers and biased detector applications.
The bond pad for the P-type Schottky diode is the cathode.
N-type Schottky diodes have lower parasitic resistance, R
S
,
and will perform with lower conversion loss in mixer circuits.
The bond pad for the N-type Schottky diode is the anode.
NEW
Skyworks Green™ products are lead (Pb)-free, RoHS
(Restriction of Hazardous Substances)-compliant,
conform to the EIA/EICTA/JEITA Joint Industry Guide
(JIG) Level A guidelines, and are free from antimony
trioxide and brominated flame retardants.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
200139 Rev. E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • September 5, 2007
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SKYWORKS [ SKYWORKS SOLUTIONS INC. ]
