Silicon Beam Lead Schottky Barrier Mixer Diodes
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1 ilicon chottky Barrier Mixer Diodes Features Ideal for MIC Low 1/f Noise Low Intermodulation Distortion Low Turn On Hermetically ealed Packages PC Controlled Wafer Fabrication Description Alpha beam lead and chip chottky barrier mixer diodes are designed for applications through 40 GHz in a 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. lead chottky 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 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. lead and chip chottky barrier diodes are categorized by noise figure for mixer applications in four frequency ranges:,, u and a bands. However, they can also be used as modulators, high speed switches and low power limiters. everal 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. lead diodes are ideally suited for balanced mixers, since they exhibit low parasitics and are extremely uniform. A typical vs. I F 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 torage Temperature: Operating Temperature: Dissipated Power: Max Current: 65 C/+175 C 65 C/+175 C 75 mw/junction 100 ma 3 12 Alpha Industries Fax Visit our web site:
2 ilicon chottky Barrier Mixer Diodes C u Frequencies 2 to 4 4 to to to 18.0 NF ZIF db ZIF NF CC ma Forward Current (ma) P Type Zero Bias N Type Medium (DME) N Type Low (DMF) P Type Low (DMB) Forward Voltage () Figure 1. Typical Forward DC Characteristics Curves Voltage vs. Current CC Local Oscillator r (mw) Figure 3. Typical Low Mixer Diode RF Parameters vs. Local Oscillator ingle Ended Mixer IG Input LO Input Balanced Mixer IG Input LO Input Coupler 3 db Hybrid Coupler Matching Network M.N. M.N. RF Bypass IF Output DC Retrun RF Bypass IF Output Forward Current (ma) N Type HIgh r (DMJ) 1 Junctions N Type HIgh r (DMJ) 2 Junctions N Type HIgh r (DMJ) 3 Junctions Forward Voltage () Figure 2. Typical Forward DC Characteristic Curves Voltage vs. Current Double Balanced Mixer LO Input IF Output Figure 4. Typical Mixer Circuits Ordering Information IG Input To order a packaged diode, simply append the part number to the package outline number. For example, a Medium Ring Quad, u band (part number DME ) in a 234 package would be ordered as DME Alpha Industries Fax Visit our web site: 3 13
3 ilicon chottky Barrier Mixer Diodes (ingles), N Type, Low, Medium, High 5 ma Packages Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF DMF Med DME DME DME High DMJ DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ (eries Pair), N Type, Low, Medium, High Packages Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF DMF Med DME DME DME High DMJ DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Alpha Industries Fax Visit our web site:
4 ilicon chottky Barrier Mixer Diodes (Common Cathode), N Type, Low, Medium, High Package Low DMF DMF Med DME High DMJ DMJ Low DMF DMF Med DME High DMJ Low DMF DMF Med DME High DMJ Low DMF Med DME High DMJ (Anti Parallel Pairs), N Type, Low, Medium, High Package Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Low DMF Med DME High DMJ Alpha Industries Fax Visit our web site: 3 15
5 ilicon chottky Barrier Mixer Diodes (Ring Quad), N Type, Low, Medium, High Packages Low DMF DMF DMF Med DME DME DME High DMJ DMJ Low DMF DMF DMF Med DME DME High DMJ DMJ Low DMF DMF DMF Med DME DME DME High DMJ DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ (Bridge Quad), N Type, Low, Medium, High Package Low DMF DMF DMF Med DME DME High DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Low DMF DMF Med DME DME High DMJ DMJ Low DMF Med DME High DMJ Alpha Industries Fax Visit our web site:
6 ilicon chottky Barrier Mixer Diodes (tar Quad), N Type, Low, Medium, High Low DMF Med DME High DMJ Low DMF Med DME High DMJ Low DMF Med DME High DMJ Low DMF Med DME High DMJ (Octo Quad Ring), N Type, Medium, High 5mA Med DME DME High DMJ DMJ Med DME DME High DMJ DMJ Alpha Industries Fax Visit our web site: 3 17
7 ilicon chottky Barrier Mixer Diodes Outline Drawings (0.25mm) (0.20mm) 2-PLC. CATHODE LEAD (0.30mm) (0.25mm) (0.46mm) (0.41mm) TOP VIEW TERMINAL CONNECTION (0.30mm) (0.25mm) (0.15mm) (0.10mm) 3-PLC (0.015mm) (0.005mm) 3-PLC (0.15mm) (0.10mm) 3 18 Alpha Industries Fax Visit our web site:
8 ilicon chottky Barrier Mixer Diodes Alpha Industries Fax Visit our web site: 3 19
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