DMF2078 Series

• Low 1/f noise
• Low intermodulation distortion
• Epoxy and hermetically sealed packages
• SPC controlled wafer fabrication

DME, DMF, DMJ Series: Silicon Beam-Lead Schottky Mixer Diodes-Singles, Pairs and Quads Bondable and Packaged Chips

Skyworks beam-lead silicon Schottky barrier mixer diodes of DMF2078 Series are designed for applications through 40 GHz. The beam-lead design reduces the problem of bonding to the very small area characteristic of the low capacitance junctions.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 with a narrow spread of capacitance values for close impedance control.A variety of forward voltages are available, ranging from low values for low, or starved, local oscillator drive levels to high values for high drive, low distortion mixer applications. Beam-lead diodes are available in a wide range of packages. Capacitance ranges and series resistances are comparable with the packaged DMF2078 Series that are available through K-band. Unpackaged diodes are well suited for use in microwave integrated circuits. The packaged DMF2078 Series are designed to be inserted as hybrid elements in strip, transmission line applications. Beam-lead Schottky barrier diodes are categorized by universal mixer applications in four frequency ranges: S, X, Ku and Ka bands. They may also be used as modulators and high-speed switches.Beam-lead diodes are suited for balanced mixers, due to their low parasitics and uniformity. 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.