This results in diodes uniquely applicable to very low distortion linear attenuators and specialized functions. This is similar to the pcairl program described in rf design magazine, november 1994, page 52. Attenuators amplifiers and active devices electronics. We use advanced design software and equipment to perfect your design. The switch is a 2pole, 6position, shorting design that never places more than two resistors in the signal path.
The new glassware balance trim is a simple ladder attenuator, with six positions, which can be used with a volume potentiometer or stepped attenuator. Using fets as the switching mechanism, this scheme is often implemented in mmic or rfic formats. Paek j s, lee h y and hong s 2011 analysis and design of cmos amplitude modulator with digitally controlled variable attenuator ieee trans. The 117b attenuator switch driver is a gpibcompatible lxi optional instrument capable of driving up to two foursection programmable step attenuators and two microwave coaxial switches concurrently. These devices are a substitute for traditional continuous potentiometers. Whispertouch 8ohm, switched volume controls provide for clear, distortionfree stereo music reproduction when one or multiple speaker pairs are powered by a single amplifier. Whispertouch decora stereo switched attenuator ivory atlasied. The design process will be presented through an example. The complete specifications for the switched attenuator are shown in table 1. Attenuators and signal selecters glassware audio design. Calculation methods for predicting attenuation of parallel baffle type silencers for use in power plant ducts and exhausts masters thesis in the masters programme in sound and vibration dario bogdanovic department of civil and environmental engineering division of division of applied acoustics vibroacoustics group.
An rf step attenuator when you can find a good, commercially made rf attenuator, expect to pay the price. Laser power attenuator lpa is a compact motorized device for laser power control. Switched stepped attenuator passive volume control. The keysight lxicompliant 117c attenuator switch driver provides remote or frontpanel drive control for 4 programmable attenuators and 4 spdt switches. The attenuator is a hybrid design that uses both series and ladder attenuators and three rotary switches to yield 36 positions of attenuation in 2db decrements. The attenuators reduces an input signal to a lower level. Series type stepped attenuators as its name implies, the series type stepped attenuator is simply a series of resistors forming one long voltage divider. When an attenuator with a fast switching speed and high power handling capacity is required, the only option is to utilize a switched bit attenuator. I was reluctant to include it in an amplifier or preamp project without knowing how i would like the result.
Heres where doing it yourself can provide you with what you need inexpensively. Resistor string value calculator for constructing stepped attenuators. Lower signal levels are achieved by the addition of 10 db and 20 db sections, or a binary multiple 16 db section. Pa1b power attenuator calculator including download. This design is based around the at250 voltage variable absorptive attenuator chip manufactured by macom and available from richardson electronics of lafox, illinois, usa under stock number at250pin.
Amplifier stepped attenuators for sale in stock ebay. Compare frequency range, attenuation range, model and number of bits to find the right switched bit attenuator from kratos. Keysight manual step attenuators offer fast, precise signallevel control up to 26. Rtqs series rectangular qseal attenuators the rectangular qseal attenuator includes the qualities of the rt series attenuator and incorporates an infill system fully. So ive been wanting to try out one of these ladder type stepped attenuators for a while now. Click here for a shunt attenuator calculator potential divider resistors rx and ry as shown. Variable attenuation can be provided in discrete steps by a switched attenuator. Rf attenuators can be used for a variety of different purposes within many rf systems. Great for checking s meters and receiver sensitivity.
Filled with realworld design techniques and rules of thumb, this practical resource offers professionals a unique look into the daytoday practices of mmic production and the economics associated with it. So you can reduce the power of you qrp set from 5 watts down to qrpp level with out modifying the set. We have stocked attenuators, rf switches and rf products to meet your immediate applications. The keysight attenuator switch drivers provide panel drive control for programmable attenuators and electromechanical or solid state switches for quick, easy design validation and automated testing. So i decided to build it into a standalone passive volume control. The um4300 and um7300 series combine a diode chip of extremely thick intrinsic region with a low thermal resistance construction. Pin diode switches are used to create two or perhaps more paths. Generate low level signals from sources including signal generators, oscillators and transmitters. Note that rx and ry are made up by the string of resistors in the chain. Minicircuits is a global leader in the design and manufacturing of rf, if, and.
The lpa is produced in the uv, visible and nir spectral ranges, from 250 nm to 2000 nm. A typical attenuator circuit will be a purely resistive network for example, this pinetwork for a balanced attenuator. The rotary switch is used to select where, in this voltage divider, the output will be. Use switcherpro power supply design software to create, manage and share custom power supply designs. Three switch stepped attenuators if you dont know what the attenuator is all about, you didnt follow the link to the glassware yahoo. The example in the figure below, shown in the 0 db position, is capable of 0 through 7 db of attenuation by additive switching of none, one or more sections. 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. Resistorswitch attenuator networks for audio volume control.
Its a great time to upgrade your home theater system with the largest selection at. Alternatively, generate r1 and r2 for a wanted attenuation. The um4300 series, with large crosssectional chip area offers the highest power capability, of the two series. The keysight attenuatorswitch drivers provide panel drive control for. Quick, easy design validation and automated testing. Refer to the rtqs series for applications where moisture may be present in the air stream. Elmas new step attenuator designed for highend audio. The keysight 117c can also be used to independently control up to 20 switches. That example is the attenuator built to work with a dell laptop computer.
Local download now al klappenbergers home page scroll down electrical engineering software home. This device consists of a series of discrete resistors and switches, of which always one switch is actually closed. This type of attenuator is more clever than the previous one, here we start with an attenuator network such as a pi or tee pad or reflection attenuator, and create resistive elements that can have two or more values. The tcj attenuator a3 uses three 6position rotary switches to yield a total of 36 positions of attenuation in 1db or 2db resolution. 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.
Electrically, it is just like a potentiometer with builtin mechanical detents. Dws8i,whispertouch decora stereo switched attenuator ivory. A3 stereo stepped attenuator glassware audio design software. It has a single resistor to ground and has series resistors on the input and output, forming a t section. Our 41db switched attenuator kit provides variable attenuation of input signals in steps of 1db. Floating wave attenuators provide peace, protection, and. Switchednetwork attenuators are versatile, once youve built one you can easily change the attenuation value. The energy below that point is dampened by the mass and breadth of the wave attenuator. Switcherpro online or desktop design software allows you to design power supplies with texas instruments tps40k controllers, lowpower dcdc converters and swift tps54xxx pointofload stepdown dcdc products.
Weinschel labviewtm based usb control center software. Headquartered in indianapolis, indiana with local sales representatives available around the world. These rf attenuators can be fixed, switched or even continuously variable. The traditional potentiometer is implemented with an electrical contact that slides over a resistive layer.
A webbased calculator to configure logarithmic attenuator circuits, or a small calculator for just individual stages. Accurate design of small single layer airwound inductors for microwave filters can be done using this free software. In terms of topology the t attenuator pad or tee attenuator pad is the opposite of the pi section resistive attenuator. My first decision was to decide how i wanted to wire up the control.
A highend good and costly alternative is the rotary switch. The only requirement is to enter the desired attenuation in decibels db and the characteristic impedance of the transmission lines to be matched. Balanced attenuator calculator electrical engineering. Minicircuits is a global leader in the design and manufacturing of rf, if, and microwave components from dc to 86ghz. The result is a superb design solution, completed to your specifications in a timely and costefficient. For the part of the wave energy from the top of the wave to the bottom of the wave attenuatar, the wave is reflected. A very fast switched attenuator circuit for microwave and r. There are many different types of rf attenuator, but the simpler ones using just resistors can be designed very easily, especially of they are for low power use.
An example of a wellknown audiograde potmeter is the alps blue. Calculation methods for predicting attenuation of parallel. This attenuator combines one or more tandem pairs of sp2t switches with a zero loss connection between one pair of outputs and a ixed attenuator inserted in the other see fig. Receiver step attenuator this step attenuator is an easy way to improve a receivers handling of strong signals and to add signal diagnostic capability. Bit topology selection algorithm in design of highly accurate cmos. This software will accurately predict, to a very high degree.
The use of this unique pa1b power attenuator calculator enables you, to design a very accurate power attenuator for any power you want. Calculates the resistor values, attenuation, minimum attenuation, impedance, reflection coefficient, vswr and return loss of a matching pi attenuator. Software to the rescue wes haywards xlad and gpla programs were. The addition of a 3 or 8 db section above enables the unit to cover to 10 db and beyond.
That is why this approach is most often used by hybrid vendors. Unmatched attenuation repeatability of less than 0. This device is combined with the unique mechanical design which ensures repeatability and high stability of performance. Designed with both benchtop and ate environments in mind. The parts are designed for the lowest insertion loss and best accuracy in the specified frequency range. We can utilize our vast resource of experienced designers and engineers from facilities all over the world. The main formats for rf resistor attenuator circuits are summarised below. Useful for hidden transmitter foxhunting to reduce received signal in controlled steps. Ive tested it and confirmed that it works, but theres. Crystal filter design is a rather complex process if done from the base mathematics or using coefficients from a book. Elma has been a leader in design innovation for over 50 years.
A program to analyse your own switchedattenuator circuit design of any topology. I picked up this 080 db switched rf attenuator at a flea market, with no part number or other useful markings other than the knob settings. Software, splitters, switches, system design, technical writing and presentations, test equipment, transformers and matching networks, transmission lines. Since both cables coming out of your attenuator are identical and use the same connector, we expect z1 and z2 the impedance seen looking into each cable to be equal. The typical multi section attenuator has more sections than the above figure shows.
The modem floating wave attenuator design works as both a reflector and an energy attenuator fig. The 1gg78103 tc750 is a 35 db by 5 db step gaas mmic step attenuator designed for good input match and low distortion from dc to 12 ghz. Switched bit attenuators selection guide kratos gm catalog. There are several different types of resistorbased attenuator designs.
1346 304 615 1514 242 1219 747 1088 1309 508 1120 406 289 844 917 259 1287 1139 358 76 985 642 176 1270 749 859 1061 69 1370 870