U1b buffers the input signal vin, and drives the first voltage controlled attenuator circuit with q1a one half of the dual fet package. The hmc346ms8g is an absorptive voltage variable attenuator vva in an 8 lead surfacemount package operating from dc 8 ghz. Millimeterwave and microwave gaas attenuators keysight technologies provides mmic attenuators ideal for microwave radio, aerospace and defense, and instrumentation applications. Computeraided design of mmic variable attenuators variable attenuators are used widely in telecommunications and electronic warfare applications to adjust the signal level or compensate for intrinsic gain variations in operating temperature. This model operates from 20 mhz to 3 ghz with fine attenuation. An attenuator is an electronic device that reduces the power of a signal without appreciably distorting its waveform an attenuator is effectively the opposite of an amplifier, though the two work by different methods. Digital attenuators rf switches usb synthesized sources. Usbrs232 variable attenuator zvva3000 product overview mini circuits zvva3000 is a 50. A lowcost surfacemount pin diode quad was used as the basis for two versions of a wideband voltagevariable attenuator with outstanding linearity performance for catv and other communications applications. Vbias, which is shown as a variable dc negative voltage varies q1as drain to source resistance to provide a voltage controlled voltage divider circuit via series. Each attenuator includes a control circuit that provides 22db of attenuation range with a linear control slope of 10dbv. Overview the va series of variable attenuators are composed of specially designed thin film polarizers, zeroorder achromatic waveplates and high precision optomechanics, all. Typical applications include radio, cellular, gps equipment and other automatic gainlevel.
Attenuators our wide selection of attenuators provide design engineers the flexibility to select products that best suit their system requirements. This compact voltage variable pindiodebased attenuator provides a wide attenuation range with outstanding linearity well suited for wireless communications systems at 3. If this sounds like what youre looking for, you have just found a quality product that will last a long time. The parts are designed for the lowest insertion loss and best accuracy in the specified frequency range. Our years of proven quality and performance make our manually. The device has been designed to operate over the 1. The frequency range of our continuously variable attenuators is from 1 ghz to 18 ghz.
Macoms voltage variable attenuators vvas are used in various. We also offer attenuator assemblies in which we package multiple programmable attenuators together with ethernet remote control. Variable attenuators and our other rf, microwave and millimeter products have no minimum purchase required and ship worldwide. Voltage variable attenuators from pasternack enterprises ship same day. The f2258 is a low insertion loss voltage variable rf attenuator vva covers a broad frequency range from 50 mhz to 6000 mhz. Variable attenuator blends dynamic range, linearity. Pxi step attenuator is a variable signal conditioning module that enhances the measurement accuracy and flexibility of pxi based rf and microwave test systems. Unlike fixed attenuators whose attenuation cannot be adjusted by a user, the attenuation levels of variable attenuators can be changed to desired values. It features an onchip reference attenuator for use with an external opamp to provide simple single voltage attenuation control, 0 to 3v. They are fixed type, step type, continuously variable type, programmable type, dc bias type and dc blocking type. Api technologies offers surface mount variable analog attenuators as well as our weinschel brand manual step attenuators and coninuiously variable attenuators. Is there a difference between voltage divider and attenuator. Voltage variable attenuators overview pdf idt pioneered glitchfree technology digital step attenuators dsas, which enable customers to simplify their software interface, improve reliability, prevent damage to expensive subassemblies such as power amplifiers, and limit overranging of data converter inputs.
The sky1223611 is a voltagecontrolled variable attenuator from skyworks series of high 3rd order input intercept point iip3 components. The optimum control voltage values for a teetype voltagevariable attenuator using mesfets can be found empirically, by setting vc1 to a fixed voltage and then. This article discusses the design, fabrication and testing of a 3 to 7 ghz, voltagecontrolled mmic attenuator and. Millimeterwave and microwave gaas attenuators keysight. Analog devices attenuators are available in a broad range of architectures and form factors, giving designers the flexibility to select a part best aligns with their system requirements. Attenuator definition, design, types and applications. Advanced design system ads empro 3d em simulation software. Basically, a voltage divider is the fundamental building block of an attenuator. Secrets of rf circuit design, third edition pin diodes and their uses another application for pin diodes is as a voltage variable attenuator in rf circuits. The device includes a patented control circuit that provides 23. Pasternack voltage variable attenuators are part of over 30,000 rf, microwave and fiber optics products available for same day shipment.
Homebrew rf test equipment and software this section will list several projects which will allow you to build your own rf design test equipment. Mmic attenuators voltage variable attenuators, vvas. Av3315 voltage variable attenuators from skyworks rf attenuator, voltage variable, 2. Our variable attenuators offer the best reliability and repeatability in the industry. Offering both voltage variable attenuators and digital attenuator designs pin, mmic, remec has an attenuator to meet your requirements with quality and performance second to none.
The max19790 is a dual, generalpurpose analog voltage variable attenuator vva designed to interface with 50. Max19790 250mhz to 4000mhz dual, analog voltage variable. For lower frequencies not much more is needed, but the higher you go in frequency, the more important it gets that throughout the whole device you stay to the intended transmission line impedance as much as possible. The pin diode variable attenuator is used to give attenuation over a range of about 20 db and can be used in 50 ohm systems. An215a rf small signal design using twoport parameters supplied with the. In addition to providing low insertion loss, the f2258 provides high linearity and low retrun loss performance over entire frequency, voltage control and attenuation ranges. The attenuator reduces the power of a signal and lowers voltage while keeping its waveform. Designing with the hmc346ms8g voltage variable attenuator. Macoms voltage variable attenuators vvas are used in various applications for automotive and wireless markets. Dataforth corporation, tucson, arizona announces the introduction of its new scmvas signal conditioning modular voltage attenuator system, an analog signal conditioning system which is designed to safely monitor and accurately measure voltage potentials up to 1200v peaktopeak.
The nonlinearized design only requires one jfet, the linearized design also uses one jfet, but has two linearization resistors. Minicircuits is a global leader in the design and manufacturing of rf, if, and microwave components from dc to 86ghz. Our vvas operate from 10 mhz to 45 ghz and are ideal for cellular infrastructure, handset gain control, radar systems, satellite radios and test equipment. These highlevel voltages are typically found in industrial. Analog devices broad selection of attenuators gives designers the flexibility to select a part with the architecture and form factor that best aligns with their system requirements. Analog devices voltage variable attenuators vvas ensure accurate control for a wide range of applications. Gaas voltage variable attenuator vva mmics for rf microwave attenuation requirements.
Variable attenuators from pasternack include female genders and can be bidirectional, depending on the power rating. Macoms maav007941 is a gaas mmic voltage variable absorptive attenuator in a low cost leadfree soic 8lead surface mount plastic package. The sky1223511 is a voltagecontrolled variable attenuator from skyworks series of high 3rd order input intercept point iip3 components. Variable attenuators are used in applications where the need exists for controlling signal levels. Rf attenuators fixed precision attenuators, highpower. Variable attenuators from fairview microwave are in stock and will ship the same day. Jfw offers programmable attenuators with either relay or solidstate designs. Our absorptive vvas are ideal for designs where an analog dc control signal controls rf signals levels over a 30 db amplitude range, while our monolithic vvas feature low insertion loss, high ip3, and wide dynamic range, as well as a balanced topology that delivers excellent return loss. Max19792 500mhz to 4000mhz dual analog voltage variable. In any rf system, there is a need for a constant impedance and this design provides an acceptable match to 50. This can be built into a flexibox and a transmission line 50 ohm track pcb is available which easily adapts for this circuit with one simple trimming. The jfw 50 ohm dual rotary attenuator has been a staple tool to rf engineers for over 30 years. The rfbased design of the attenuator is of six types. Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, vswr and return loss of a matching pi attenuator.
Formerly the product line from amplifonix, digital attenuators are available in frequency ranges from 10 to 2000 mhz. The maav007941 is ideally suited for use where attenuation fine tuning, fast switching and very low power consumption are required. Relay programmable step attenuator electromechanical variable step attenuators are. Two of the more common and most costeffective designs for jfet vcr are the nonlinearized and linearized vcr design. This variable attenuator product line includes low to high power attenuators which have the power handling up to 5 watts. A digital attenuator is essentially the opposite of an amplifier.
When voltage variable gain control is required, voltage variable attenuators vvas are available in frequency ranges from 5 to 2000 mhz. The av1421 voltagevariable attenuator vva is targeted at designs spanning the 2. Remec offers a large variety of attenuators, designed for both commercial and military applications. While an amplifier provides gain, an attenuator provides loss, or gain less than 1. The attenuator design closely matches the impedance around each resistor, to. This article discusses the design, fabrication and testing of a 3 to 7 ghz, voltagecontrolled mmic attenuator and demonstrates the circuit simulation, test equipment control and dataacquisition capabilities of the mmicad suite of computeraided engineering cae and computeraided test cat software. Barth high voltage pulse attenuators are matched impedance coaxial attenuators for use primarily in pulsed 50 ohm systems, or where occasional transients would damage ordinary units. Mixer as a voltage variable attenuator describe how you might use a mixer as a voltage variable rf attenuator. In fixed type attenuators the resistor network is locked at a predetermined attenuation value. The device has been designed to operate over the 2. The arcoptix electrical adjustable variable attenuator is a worldwide unique liquid crystal device that permits to control precisely the attenuation of a free space traveling beam with a simple applied voltage. Macoms voltage variable attenuators vvas are used in various applications for.
Microwave construction techniques and basic electronic skills will be required on some projects, but the tools you can. Developed using gaas phemt process, the part delvers a 0. High voltage pulse attenuators barth electronics, inc. The variable gray filter functions for polychromatic or monochromatic light as well as for unpolarized or polarized white light. Usbrs232 variable attenuator zvva3000 minicircuits. Rf variable attenuator which combines the performance benefits of a voltage variable design with the convenience and easeofuse of a software controlled step attenuator. F2258 wideband voltage variable rf attenuator renesas. Combination of voltage variable pin diodes with digital interface provides very fine attenuation steps 0. A voltage variable attenuator is an electronic device that provides a variable attenuation depending on the voltage applied. These variable attenuators are part of over 1 million rf and microwave products available for sameday shipment from fairview.
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