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Silicon Beam-Lead Schottky Barrier Mixer Diodes
DME, DMF and DMJ Series
Features
Ideal for MIC Low 1/f Noise Low Intermodulation Distortion Low Turn On Hermetically Sealed Packages SPC Controlled Wafer Fabrication
Description
Alpha beam-lead and chip Schottky barrier mixer diodes are designed for applications through 40 GHz in Ka-band. The beam-lead design eliminates the problem of bonding to the very small junction area that is characteristic of the low capacitance involved in microwave devices. Beam-lead Schottky barrier mixer diodes are made by the deposition of a suitable barrier metal on an epitaxial silicon substrate to form the junction. The process and choice of materials result in low series resistance along with a narrow spread of capacitance values for close impedance control. A variety of forward knees are available, ranging from a low value for low, or starved, local oscillator drive levels to a higher value for high drive, low intermode mixer applications. The beam-lead diodes are available in a wide range of packages as shown. Capacitance ranges and series resistances are comparable with the packaged devices that are available through K-band. The unmounted diodes are especially well suited for use in microwave integrated circuits. The mounted devices can be easily inserted as hybrid elements in stripline, microstrip or other such circuitry. Beam-lead and chip Schottky barrier diodes are categorized by noise figure for mixer applications in four frequency ranges: S, X, Ku and Ka-bands. However, they can also be used as modulators, high speed switches and low power limiters. Several types of semiconductor-barrier metal systems are available, thus allowing proper selection for optimum mixer design. For most applications the N-type silicon, low drive types are preferable, especially for starved LO mixers. Beam-lead diodes are ideally suited for balanced mixers, since they exhibit low parasitics and are extremely uniform. A typical VF vs. IF curve is shown in Figure 1. Typical noise figures vs LO drive is shown in Figure 2 for single N-type, low drive diode types.
Maximum Ratings
Storage Temperature: Operating Temperature: Dissipated Power: Max Current: -65C/+175C -65C/+175C 75 mW/Junction 100 mA
3-12
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
Silicon Beam-Lead Schottky Barrier Mixer Diodes
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DME, DMF and DMJ Series
NF ZIF dB 12.0 700 11.0 600 10.0 500 9.0 400 8.0 300 7.0 200 NF CC mA 6.0 5.0 4.0 3.0 2.0 1.0 CC 0 0.05 0.1 0.2 0.5 1.0 2.0 5.0 10.0
Band S C X Ku
Frequencies 2 to 4 4 to 8 8.2 to 12.4 12.4 to 18.0
ZIF
10.0 5.0
6.0 100
P-Type Zero Bias
0.01
Forward Current (mA)
2.0 1.0 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 0 120 240
P-Type Low Drive (DMB) N-Type Low Drive (DMF) N-Type Medium Drive (DME)
Local Oscillator Driver (mW)
3
Figure 3. Typical X-Band Low Drive Mixer Diode - RF Parameters vs. Local Oscillator Drive
Single Ended Mixer
SIG Input Coupler LO Input Matching Network RF Bypass IF Output
360
480
600
DC Retrun
Forward Voltage (mV)
Figure 1. Typical Forward DC Characteristics Curves - Voltage vs. Current
Balanced Mixer
SIG Input 3 dB Hybrid Coupler LO Input M.N. M.N. RF Bypass IF Output
N-Type HIgh Driver (DMJ) 1 Junctions
N-Type HIgh Driver (DMJ) 2 Junctions
N-Type HIgh Driver (DMJ) 3 Junctions
Double Balanced Mixer
LO Input SIG Input
10.0 5.0
Forward Current (mA)
2.0 1.0 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 0 0.480 0.960 1.44 1.92 2.40
IF Output
Figure 4. Typical Mixer Circuits
Ordering Information
Forward Voltage (mV)
Figure 2. Typical Forward DC Characteristic Curves - Voltage vs. Current
To order a packaged diode, simply append the part number to the package outline number. For example, a Medium Drive Ring Quad, Ku band (part number DME2859-000) in a 234 package would be ordered as DME2859-234.
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
3-13
Silicon Beam-Lead Schottky Barrier Mixer Diodes
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DME, DMF and DMJ Series
Beam-Lead (Singles), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Min. Max. RS 5 mA Max. VB 10 A Min. 2 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Low Med High Low Med High Low Med High Low Med High Beam Lead 491-011 DMF2820-000 DME2127-000 DMJ2823-000 DMF2821-000 DME2957-000 DMJ2777-000 DMF2344-000 DME2333-000 DMJ2824-000 DMF2822-000 DME2458-000 DMJ2825-000 250 DMF2820-250 DME2127-250 DMJ2823-250 DMF2821-250 DME2957-250 DMJ2777-250 DMF2344-250 DME2333-250 DMJ2824-250 DMF2344-230 DME2333-230 DMJ2824-230 DMF2822-230 DME2458-230 DMJ2825-230 Epoxy Packages 230
Freq. Band Bd
Drive Level
S
0.30
0.50
5
3 4 2
X
0.15
0.30
8
3 4 2
KU
0.05
0.15
13
3 4 2
K
-
0.1
18
3 4
Beam-Lead (Series Pair), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Freq. Band Min. Max. RS 10 mA Max. VB 10 A Min. 2 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Low Med High Low Med High Low Med High Low Med High Beam Lead 504-012 DMF2835-000 DME2050-000 DMJ2092-000 DMF2826-000 DME2829-000 DMJ2093-000 DMF2827-000 DME2830-000 DMJ2832-000 DMF2828-000 DME2831-000 DMJ2833-000 252 DMF2835-252 DME2050-252 DMJ2092-252 DMF2826-252 DME2829-252 DMJ2093-252 DMF2827-252 DME2830-252 DMJ2832-252 DMF2827-232 DME2830-232 DMJ2832-232 DMF2828-232 DME2831-232 DMJ2833-232 Epoxy Packages 232
Drive Level
S
0.30
0.50
5
3 4 2
X
0.15
0.30
8
3 4 2
KU
0.05
0.15
13
3 4 2
K
-
0.1
18
3 4
3-14
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
Silicon Beam-Lead Schottky Barrier Mixer Diodes
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DME, DMF and DMJ Series
Beam-Lead (Common Cathode), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Min. Max. RS 10 mA Max. VB 10 A Min. 2 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Low Med High Low Med High Low Med High Low Med High Beam Lead 504-013 DMF2182-000 DME2205-000 DMJ2208-000 DMF2183-000 DME2206-000 DMJ2209-000 DMF2184-000 DME2207-000 DMJ2210-000 DMF2834-000 DME2835-000 DMJ2836-000 DMF2184-253 DMJ2208-253 DMF2183-253 Epoxy Package 253 DMF2182-253
Freq. Band
Drive Level
S
0.30
0.50
5
3 4 2
3
X
0.15
0.30
8
3 4 2
KU
0.05
0.15
13
3 4 2
K
-
0.1
18
3 4
Beam-Lead (Anti-Parallel Pairs), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Min. Max. RS 10 mA Max. VB 10 A Min. 2 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Low Med High Low Med High Low Med High Low Med High Beam Lead 522-025 DMF2185-000 DME2282-000 DMJ2303-000 DMF2186-000 DME2283-000 DMJ2304-000 DMF2187-000 DME2284-000 DMJ2246-000 DMF2837-000 DME2838-000 DMJ2839-000 Epoxy Package 251 DMF2185-251 DME2282-251 DMJ2303-251 DMF2186-251 DME2283-251 DMJ2304-251 DMF2187-251 DME2284-251 DMJ2246-251
Freq. Band
Drive Level
S
0.30
0.50
5
3 4 2
X
0.15
0.30
8
3 4 2
KU
0.05
0.15
13
3 4 2
K
-
0.1
18
3 4
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
3-15
Silicon Beam-Lead Schottky Barrier Mixer Diodes
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DME, DMF and DMJ Series
Beam-Lead (Ring Quad), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Min. Max. RS 10 mA Max. VB 10 A Min. 2 3 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Low Med High Low Med High Low Med High Low Med High Beam Lead 488-002 DMF2865-000 DME2857-000 DMJ2502-000 DMF2011-000 DME2858-000 DMJ2990-000 DMF2012-000 DME2859-000 DMJ2667-000 DMF2454-000 DME2459-000 DMJ2455-000 254 DMF2865-254 DME2857-254 DMJ2502-254 DMF2011-254 DME2858-254 DMJ2990-254 DMF2012-254 DME2859-254 DMJ2667-254 DMF2012-234 DME2859-234 DMJ2667-234 DMF2454-234 DME2459-234 DMJ2455-234 DMF2011-234 Epoxy Packages 234 DMF2865-234 DME2857-234
Freq. Band
Drive Level
S
0.30
0.50
5
4 2 3
X
0.15
0.30
8
4 2
KU
0.05
0.15
13
3 4 2
K
-
0.1
18
3 4
Beam-Lead (Bridge Quad), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Min. Max. RS 10 mA Max. VB 10 A Min. 2 3 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Beam Lead 488-004 DMF2076-000 DME2029-000 DMJ2312-000 DMF2077-000 DME2850-000 DMJ2088-000 DMF2078-000 DME2031-000 DMJ2768-000 DMF2848-000 DME2851-000 DMJ2852-000 255 DMF2076-255 DME2029-255 DMJ2312-255 DMF2077-255 DME2850-255 DMJ2088-255 DMF2078-255 DME2031-255 DMJ2768-255 Epoxy Package 235 DMF2076-235
Freq. Band
Drive Level Low Med High Low Med High Low Med High Low Med High
S
0.30
0.50
5
4 2 3
X
0.15
0.30
8
4 2
KU
0 05 0.05
0 15 0.15
13
3 4 2
K
-
0.1 01
18
3 4
3-16
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
Silicon Beam-Lead Schottky Barrier Mixer Diodes
www..com
DME, DMF and DMJ Series
Beam-Lead (Star Quad), N-Type, Low, Medium, High Drive
CJ 0V 1 MHz pF Freq. Freq Band Min. Max. RS 10 mA Max. VB 10 A Min. 2 Min. 200 300 500 250 325 550 260 350 500 270 375 600 VF 1 mA mV Max. 260 400 600 310 425 650 330 450 680 350 550 700 Drive Level Low Med High Low Med High Low Med High Low Med High Beam Lead 520-034 DMF2137-000 DME2191-000 DMJ2193-000 DMF2138-000 DME2192-000 DMJ2194-000 DMF2189-000 DME2178-000 DMJ2195-000 DMF2190-000 DME2174-000 DMJ2180-000
S
3 0.30 0 30 0.50 0 50 5 4 2
3
X
3 0 15 0.15 0 30 0.30 8 4 2
KU
3 0.05 0 05 0.15 0 15 13 4 2
K
3 - 0.1 01 18 4
Beam-Lead (Octo Quad Ring), N-Type, Medium, High Drive
Freq. Band CJ 0V 1 MHz pF Min. Max. RS 5mA Max. VB 10 A Min. 6 Min. 600 1000 650 1100 VF 1 mA mV Max. 800 1200 850 1300 Beam Lead 294-020 DME3273-000 DMJ4759-000 DME3274-000 DMJ4771-000 Epoxy 257 DME3273-257 DMJ4759-257 DME3274-257 DMJ4771-257
Drive Level L l Med High Med High
S-X SX
0.15
0.30
10
8 6
KU
0.05
0.15
16
8
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
3-17
Silicon Beam-Lead Schottky Barrier Mixer Diodes
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DME, DMF and DMJ Series
Outline Drawings
484-004 491-011
488-002
504-012
TOP VIEW TERMINAL CONNECTIONS 0.010 (0.25mm) 0.008 (0.20mm) 2-PLCS. 0.018 (0.46mm) 0.016 (0.41mm)
CATHODE LEAD 0.012 (0.30mm) 0.010 (0.25mm)
0.012 (0.30mm) 0.010 (0.25mm)
0.006 (0.15mm) 0.004 (0.10mm) 3-PLCS. 0.006 (0.15mm) 0.004 (0.10mm)
0.0006 (0.015mm) 0.0002 (0.005mm) 3-PLCS.
3-18
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
Silicon Beam-Lead Schottky Barrier Mixer Diodes
www..com
DME, DMF and DMJ Series 522-025
504-013
3
520-034
Alpha Industries * [617] 935 5150 * Fax [617] 824 4579 * E-mail sales@alphaind.com * Visit our web site: www.alphaind.com
3-19

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