Series Loss Coarse Limiters Watt Midrange Limiters Clean-Up

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Series Loss Coarse Limiters Watt Midrange Limiters Clean-Up

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Limiter Diodes
Series
Loss Coarse Limiters
Watt Midrange Limiters Clean-Up Limiters
Description
Alpha pioneered microwave limiter diode. Because phases manufacturing, from design through epitaxy finished device, specifically tailored this application, Alpha limiters have lower loss, greater bandwidth faster turn-on time than equivalent competitive diodes. Alpha's series thin base limiter diodes will provide passive receiver protection over entire range frequencies from beyond GHz. These diodes silicon devices with thin intrinsic region, typically microns CLA4603 4601, microns CLA4606, 4604, 4605, microns CLA4607 4608 series. They operate power dependent variable resistance, through mechanisms charge injection storage, similar rectification, when used microwave circuitry shown Figure different region thicknesses capacitances provide variable threshold leakage power levels power handling capability. CLA4607 4608, which handle incident pulses used "coarse" prelimiters, with thinner diodes used clean-up "fine" limiters reduce leakage power protecting most sensitive receivers.
Chip Dimensions
Model Number CLA4601-000 CLA4602-000 CLA4603-000 CLA4604-000 CLA4605-000 CLA4606-000 CLA4607-000 CLA4608-000
Diameter (Typ.) Inches 0.0012 0.0015 0.0015 0.0015 0.0025 0.002 0.003 0.005 0.02 0.04 0.04 0.04 0.06 0.05 0.75 0.12
Chip Style 150-806 150-806 149-801 150-806 150-801 149-801 149-801 149-801
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Limiter Diodes Series
Connector
CLA4607 Ground Return
CLA4606
CLA4603 Receiver 0.020" Typ.
Figure Cascaded Limiter Design
CLA4607
Schottky Barrier CMB7602 Receiver
Figure Quasi-Active Limiter CLA4603 4606 limiter diodes constructed passivated flat-chip configuration available basic chip form encapsulated variety Alpha glass ceramic packages, which shown. Limiter diodes with lower capacitance values, 0.08 constructed with passivated mesa configuration, available CLA4601 4605 series. mesa devices offer therefore broader bandwidth, lower loss, faster response, reduced power. These diodes also available chip package form, represent ultimate limiter performance, approached other manufacturers. CLA4607 diodes (highest power) available both planar mesa construction. Figures illustrate fundamental structures diodes mounted microstrip circuit. diode characteristics listed table refer chips mounted such circuit. designer these parameters modeling chip package, provided overall package parasitics considered. Additional bonding handling methods contained Alpha application notes.
Diode Typ. Board
Coil Ground Return
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Ground Plane Solder Epoxy Bond Microstrip Board 0.006" Thick Typ.
0.001" Gold Wire Bond Typ.
Figure Side View
Ground Return
Conductor 0.022"
Figure View
Figure Level Equivalent Circuit
Limiter Diodes Series
Basic Application
When designing microstrip limiters bonding wire length diameter, conjunction with chip capacitance, form pass filter (see Figure Line lengths (L1, varied provide broadband matching flat leakage characteristics. Typically, order wavelength. Figure CLA4607 chip provides about attenuation, reducing input watts. CLA4606 reduces this CLA4603 about During rise time incident pulse, diodes behave following manner. CLA4603, thin region, first change impedance. Experiments indicate that CLA4603 reaches isolation point about with incident power watts. CLA4606 takes about CLA4607 about Consequently, CLA4603 provides protection during initial stages pulse rise time, with thicker diodes progressively "turning power increases. With proper spacing L2), "on" diodes reflect high impedances upstream diodes, reducing turn-on time those diodes ensuring that essentially incident power reflected input diode, preventing burnout thinner diodes. pulse process reverses, diodes "recover" high impedance state; free charge which injected region incident power leaks through ground return additionally reduced internal combination. With ground return, recovery time order With high impedance return, example circuit Figure Schottky diodes recovers "opens" practically zero time, internal recombination, order several diode lifetimes, only available mechanism recovery. This recovery time long-on order CLA4607 series. shunt resistor minimizes problem. hundred ohms will approximately double recovery time, compared short circuit. When Schottky diode directly coupled transmission line, cascade after coarse limiter, leakage power will less than zero ground return were used. Schottky decoupled much, leakage power increases, owing high impedance Schottky. Similarly, ground return causes increase about leakage power compared zero return.
Coil Ground Return
Figure High Power Equivalent Circuit
1.75
Bonding Wires
Diode Chip
0.50
1.50 VSWR
Single Section single Pass Filter
0.30
1.25
0.15
Frequency (GHz)
Figure Typical VSWR Pass Filters
Bonding Wires Diode Chip
Insertion Loss (dB)
Single Diode Section
0.50 0.30
0.15
Frequency (GHz)
Figure Typical Diode Insertion Loss Frequency
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Limiter Diodes Series
Peak Normalized Tabulated Value C/W)
100.0 Leakage Power Above (dB)
Diode Chip
°C/W CLA4607, Series
10.0
°C/W CLA4601, Series
Frequency (GHz)
Pulse Length (Sec)
Figure Pulsed Thermal Impedance
Figure Leakage Power Frequency
Diode Chip
Peak Power Output (dBm)
Power Derating Factor
CLA4607
0.75
CLA4606 CLA4604 CLA4603
CLA4601
0.50
0.25
-50°C
+50°C
+100°C
+150°C
Peak Pout Input (dBm)
Case Temperature (°C)
Figure Typical Peak Leakage Power
Figure Power Handling Capability Temperature
Ordering Information
table following page shows part numbers chip limiter diodes. Packaged limiter diodes specified adding package number chip number. example, CLA4605-210 CLA4605-000 package. recommended packages limiter diodes shown page 6-11. Available through distribution: CLA4603-210 CLA4606-210 CLA4607-210 CLA4603-240 CLA4606-240 CLA4607-240
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Limiter Diodes Series
Electrical Specifications 25°C
Part Number CLA4601-000 CLA4602-000 CLA4603-000 CLA4604-000 CLA4605-000 CLA4606-000 CLA4607-000 CLA4608-000 Typ. 15-30 20-45 30-60 45-75 120-180 120-180 (pF) Typ. 0.12 0.20 0.20 0.12 0.20 0.20 0.20 0.80 (pF) Max. 0.10 0.15 0.15 0.10 0.15 0.15 0.15 0.50 1000 Typical1 @1.0 Typ. 3000 2000 2000 3000 2000 2000 2000 (°C/W) Typ. (°C/W) (ns) Typ.
Available through distribution.
Typical Performance
Part Number CLA4601-000 CLA4602-000 CLA4603-000 CLA4604-000 CLA4605-000 CLA4606-000 CLA4607-000 CLA4608-000 Peak (1.0 (dBm) Max. Threshold4 (dBm) Typ. Leakage4 POUT (dBm) Typ. Insertion Loss2 (dBm) Typ. Power Max. Recovery6 Time, (ns) Typ.
Series resistance measured MHz. Chip loss represented resistance shunt with junction capacitance. measured GHz, zero bias. Figure indicates typical variation with frequency. Loss data shown 0.15 0.30 chips, 0.50 chips. Reflective loss shown Figure included. Loss measured input. Pulsed thermal impedance given pulse. Figure shows typical variation longer pulse lengths. thermal impedance presumes infinite heat sink. Threshold input power produces increase insertion loss. Figure shows typical leakage power curves. Data taken GHz. Figure shows typical variation with frequency. Note especially roll-off CLA4607 higher frequency. Note that power average power synonymous. Power ratings computed terms peak junction temperature 200°C, short pulses, average junction temperature 125°C, ambient 25°C. Duty factor 0.001 assumed maximum pulse power input. Figure shows power derating with temperature. Recovery time measured with ground return (less than ohm) excess loss, GHz.
Outline Dimensions
149-801 Series
Chip Style 150-801 150-806
Bonding Nominal (In.) .002 (min) .0011 (min)
Chip Size (In.) Min. .010 .010 Max. .014 .014
METALIZED GOLD
SILICON
.004 .006
METALIZED BACK CONTACT GOLD
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Series Loss Coarse Limiters Watt Midrange Limiters Clean-Up

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