Mounting of the yig and the tuning driver circuit board. Once the first yig tuned filter is tuned and the rf source frequency and power set, the second yig tuned filter is tuned to the correct, systems, or. Any luck purchasing yig tuned oscillators from ebay. This additional material on yig technology just in from james, a semiconductor guy with some rf test experience. Yig tuned filters with commercial serial drivers poweron reset the mlwi digital driver has a poweron reset circuit to set the dacs output to ovfmin in unipolar mode when vdd is first applied. The yig is mounted on a small piece of art foam to help avoid any microphonics from vibrations. Micro lambda yig filters, model types mlfp series and mlfrseries are available with integrated digital driver circuits. Tracking yig tuned filtermixer hewlettpackard company. They have a standard pin configuration, which is almost always the same fig. In addition, since the spectrum analyzer is a tuned receiver, measurements are not affected by spurious signals or harmonics. Yto yig tuned oscillator and yig yttriumirongarnet. Elva1 produces bandpass yig tuned filters of eyf series. The frequency range of up to 6 ghz was selected based on lab equipment available to students at sjsu. In special cases, speedup circuits like those used to improve tuning speed of yigoscillators can be included to provide both fasttuned and with good accuracy.
Same day shipping on all tunable filter designs in stock at quest components. A tracking yig tuned filter mixer circuit is provided. The tuning sensitivity for all four filters is typically 20 mhz ma, with worstcase tuning linearity of 3 mhz for the two lowerfrequency filters and 5 mhz for the two. Micro lambda yig filters, model types mlfp series and mlfrseries are available with integrated analog driver circuits. Yig products this analog driver is one of raditeks family of yig products designed for raditeks rybpfi3 and rytoi3 series. Lots of microwave circuit design needed for filter bank expensive, the chip itself is eur 58, and then comes all the switches rogerslike board needed for. This ensures that unwanted dac output voltages will not occur immediately following a system powerup, such as after power loss.
Integrated circuits ics interface filters active are in stock at digikey. Yig tuned filters a yig tuned filter consists of multiple yig spheres as filter elements. Filter circuitsworkingseries inductor,shunt capacitor,rc. If theres more than one sma connector, its almost certainly a filter. In the preferred embodiment, four yig tuned resonators are combined to provide a tracking filter mixer with a switched input. Bandwidth of the circuit should be a few 100 hz, and maximum. Is it possible to use a yig tuned filter to make a yig. The ytm from the hp 867x series ive seen all had a destroyed yig coupling loop on output circuit. All amateur radiorelated projects, tips, tricks, and tools. Dragged it to the microwave lab at the university, and tested it on a spectrum analyzer. A drive circuit for the pretune coil could be nothing more than an npn pass transistor operated as an.
Pass band reject yig filters are electronically tunable in octave andor multioctave frequency range from 500 mhz to 18 ghz. Teledyne defense electronics, llc teledyne microwave solutions tms delivers high quality yig products including closed and open loop yig filters, yig oscillators, yig tuned harmonic generators, and yig based integrated receiver frontendstuners. Performance options the hp 85644a tracking source is. A subsequent bandpass filter selects the desired harmonic frequency and removes the. Yttrium iron garnet yig is a crystal that has very high q characteristics. The band reject filter comprises one or more ferrimagnetic spheres shielded from each other by placement in nonmagnetic, electrically conductive cavities in a block placed in the flux gap of a tuning magnet.
A microwave filter using yig sphere as the resonant element. This application note assumes that the user is familiar with the fundamentals of yig oscillator and filter tech nologies see y ig oscillator, and yig filter technical. All drivers in this series provide input voltage regulators, and compensation circuits to improve frequency drift. These band passband reject yig filters consist of two units designed and integrated under a common tuning magnetic circuit. Yig tuned oscillator yto yig tuned filter ytf driver. Yigtuned oscillator design on printed circuit board using. Phase locking a yig tuned oscillator page 1 eevblog electronics community forum. Raditek providing high quality, low cost wireless and microwave products.
Edn micro lambda wireless unveils tunable yig filters. Input regulators for improved stability versus power supply variations. Each switch has a time associated with both the driver circuit employed and the bias. Improving power leveling range of microwave signal source using dualslope logarithmic amplifier by loo choo khiam thesis submitted in fulfillment of the requirements for the degree of master of science engineering december 2007. This application note assumes that the user is familiar with the fundamentals of yig oscillator and filter tech nologies see y ig oscillator, and yig filter. As will be discussed shorty, in some embodiments, the invention may comprise a combination yig based, closedloop signal filtering filter and amplitude control e. Yig filter can be maximized down to the component level. This high q provides very low phase no ise in oscillators and multi octave frequency tuning for both oscillators and filters.
Yig oscillator connections the connections of a yig oscillator are shown in the circuit. A nonreciprocally coupled ferrimagnetic band reject and bandpass filter having passbands from 218 ghz and 618 ghz respectively. Both admiral microwaves and sister company, aspen electronics, have specialists on hand to advise customers on selecting accessories, or indeed, specifying equipment for all their rf and microwave systems and component test and verification needs. Wirebonding, the key to microwave and millemeterwave.
Consisting of a step recoverydiode and a yig tuned filter, the multiplier converts the amplified yto signal to useful rf power levels at twice and three times the yto frequency. Yig drivers act as digital wordtocurrent convert, converting standard 12 bit binary numbers into ma of current to tune a magnetic tuning coil. Yig crystals are grown, similar to sil icon crystals. The number of spheres stages determines the filter bandwidth and tuning range. Dec 12, 2017 as will be discussed shorty, in some embodiments, the invention may comprise a combination yig based, closedloop signal filtering filter and amplitude control e. Including all types of yig band pass, filters, yig tuned filters, rybpf, ryad, rydd, analog driver, digital driver, rybpffb, filter bank. Frequency multipliers consist of a nonlinear circuit that distorts the input signal and consequently generates harmonics of the input signal. The filters benefit from the highquality factor highq properties of yig spheres, which can be tuned within an electromagnetic em field by means of an applied current. Request pdf yig tuned oscillator design on printed circuit board using surface mount technology previously most of microwave circuits were designed based on thin film or thick film technologies. Design aspects of a linear, stabilized voltage to current transducer for driving yig tuned microwave devices are analysed.
If you havent already, its also worth looking into what is required to drive a yig oscillator its not just a rail, you need. The main reason for all these drawbacks is the use of inductor in the filter circuit. It was decided to make a yig resonator and an amplifier as separate circuits with rf connectors. The oscillator includes a transistor capable of driving a load coupled to a first port of the transistor, a reactive feedback element coupled to a second port of the transistor, a yig resonator, and coupling means for coupling the yig resonator to both a third port of the. For yig band pass filters and yig tuned oscillators see. These yig filters offer excellent tuning linearity, good frequency stability, excellent selectivity and offresonance rejection. Yig tuned filters use several spheres for a high order filter. Micro lambda drivers eliminate the need for customers to design or develop their own driver. Typical circuits with op amp interfacial input and bipolarvmos current. Yig tuned filters with military serial drivers poweron reset the mlwi digital driver has a poweron reset circuit to set the dacs output to ovfmin in unipolar mode when vdd is first applied. For a digitally controlled yig oscillator and filter, a driver is needed that can convert serial data from a microcontroller to a well defined, stable, and low noise current. So, i bought a microlambda yto on ebay, advertised as 28 ghz. When the circuit is oscillating its impedance is resistive and the collector and base voltages are 180 o out of phase. Field coils produce a magnetic tuning field that is uniform over the four yig resonators.
In order to maintain oscillations called frequency stability the voltage applied to the tuned circuit must be inphase with the oscillations occurring in the tuned circuit. There are three broad categories of filter which are widely used. Sep 20, 2016 yig filters and oscillators brochure source. Each unit comprises a tunable filter, an ac power supply,a heat sink with fan, a 16key dataentry keypad, a mechanical tuning knob, a. Technology description yig tuned filters w hat is yig. Digitally tunable bandpass filter computer control tunes this versatile bandpass filter to meet changing requirements.
C components of the rectified output, but allows the d. Micro lambda drivers eliminate the need for customers to design or develop their own driver circuits and sophisticated test and alignment procedures. This allowed the team to work on them independently, characterize them, simulate how. Tracking yig components tracking the yto harmonic with the singlepole yig tuned filter proved to be a. In electronics, a frequency multiplier is an electronic circuit that generates an output signal whose output frequency is a harmonic multiple of its input frequency. Micro lambda yig filters, model types mlfp series, mlfrseries and mlfrdseries are available with integrated digital driver circuits. Figure 1 shows the block diagram of a conceptual signal generator. Edn micro lambda wireless unveils tunable yig filters for. Dec 29, 2010 based on micro lambda wireless yig tuned filter devices, the mlbf series of benchtest filter assembliescovers a frequency range from 500 mhz to 50 ghz in both bandpass andbandreject versions. A broadband yig tuned oscillator is disclosed that has both series and parallel feedback provided by a yig sphere. In special cases, speedup circuits like those used to improve the tuning speed of yig oscillators can also be included to provide both fast tuned filters and with good accuracy. It is coupled to an amplifier which provides the required feedback for oscillation. As you have seen, by making the capacitance or inductance variable, the frequency at which a circuit will resonate can be controlled. Yig filters and oscillators teledyne defense electronics.
These are then usually tuned with a tuning voltage of between 0 and 10v. If we use a resistance in series, instead of the inductor as the filter, these drawbacks can be overcome. Micro lambda wireless offers an extensive range of yig tuned filters for use with the mlbf series. It has interesting magnetic properties which allow it to perform as a tunable microwave filter for example. Yig filters tuned by a sweep current are used in spectrum analyzers. Az components home about service department suppliers products. A filter circuit is in general a combination of inductor l and capacitor c called lc filter circuit. This yields filter driver combinations set at the factory with excellent frequency accuracy performance. To remove the ac components or filter them out in a rectifier circuit, a filter circuit is used. Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. In practical yig tuned oscillators and filters, the magnetic field is derived from an electromagnet and the resonant frequency of the yig sphere is proportional to the current flowing through the magnetic coil. Elva1 yig tuned bandpass filters cover octave and multioctave frequency band from 1 to 37. An electromagnet then tunes the yig filter to select the desired harmonic. A filter is a circuit whose transfer function, that is the ratio of its output to its input, depends upon frequency.
These measurements have the advantage of high dynamic range and speed. Gigatronics has different configurations covering many microwave frequency bands in a variety of package styles with many driver options. Note that yig filters can be configured as either bandpass filters or notch filters. Us5418507a yig tuned high performance filters using full. Yigtuned filters a yigtuned filter consists of multiple yig spheres as filter elements. Unless you take the filter apart and assemble the amplifier on the coupling to the spheres, the electrical length in and out of the filter will dominate the phase shift round a sustaining amplifier, meaning you will probably need additional switchable phase shift to be able to oscillate at all frequencies. Angt143a frequency switching speed in microwave signal. The step recovery diode impulse generator is driven at a subharmonic of the desired output frequency. Analog and digital drivers are available for all ferretec yig products. Introduction this project began as development of a yig based oscillator.
Yig oscillators and filters with basic coil driver circuits to facilitate tuning of the yig component output fre quency. Lowpass filters allow any input at a frequency below a characteristic frequency to pass to its output unattenuated or even amplified. Finally, id like to mention two other types, although they are rare. Yig is a ferrite with very high resistivity and a sharp ferrimagnetic resonance. In addition, the yig control circuitry must be very stable with temperature and time and must compensate for the tuning errors in herent in magnetically tuned devices. In this circuit, the ripples have to be made to drop across the resistance r instead of the load resistance rl. Lc oscillator tutorial and tuned lc oscillator basics. The ytm from one of the more modern hp 867x sweepers very similar to the above ytm but this one has an internal amplifier to drive.
Integrating a driver at micro lambdas factory ensures that peak perform. Audio filter circuit can be formed by simple cascading high pass filter circuit and low pass filter circuit and is generally the choice for simplicity of design and performance through such a circuit can be realized by number of possible circuit. Gigatronics has different configurations covering many microwave frequency bands in a variety of package styles with many driver. Frequency switching speed in microwave signal generators. Yig tuned filters with commercial digital drivers pd series continued bandpass filters with positive input digital drivers 0. Yig tuned band reject filter for 218 ghz with full one. Each switch has a time associated with both the driver. Yig tuned oscillator using composite feedback avantek, inc. Avantek yf850107 yig filter artisan technology group. Another yig application is yig oscillators, where the sphere acts as a tunable frequencydetermining element. Jun 22, 1993 in april 1989, the then existing state of the prior art in yig tuned notch filter design was summarized by w. Microwave synthesizer modules yigtuned filters yig. Resonant circuits as filter circuits the principle of series or parallelresonant circuits have many applications in radio, television, communications, and the various other electronic fields throughout the navy. A connection diagram should acquired for these types, since no rules are applicable here.
Yigbased closed loop signal filtering and amplitude control. Ryad ryadi3 specifications may be subject to change 021411 world hq. Driver tunin when properly biased, the driver converts the y ig filter to a voltage tuned device where a control voltage of 0 to 10 volts tunes the filter over the specified output frequency range. Jan 11, 2015 what is a filter circuit a rectifier is actually required to produce pure d.
Filter circuits inductor filter, lc filter, clc or pi. Yigtuned front ends for ecm front ends for ecm, octave and multioctave discriminators, integrated local oscillator with prepostselector yig filters the superb tracking of the yig oscillator versus the yig filter is attributed by the ideal design of the magnetic circuit and the coupling technique used between yig sphere and active elements. Keane in a design note, design criteria for yig tuned bandreject filters, ferretec, inc. This option adds a microwave mixer, a second yig tuned filter, a second gaas amplifier, and associated signal switching. Make sure you know the difference between a yig oscillator and a yig filter. The yig filter has a yttrium iron garnet sphere that is tuned with a magnetic field. Microwave synthesizer modules yigtuned filters yigtuned.
Teledyne microwave solutions yig products supplies both closedand openloop yig filters, yig oscillators, yig tuned harmonic generators, and yig based integrated receiver frontends tuners. In environ ments with large amounts of electromagnetic. The butterworth filter is generally used in audio system which is characterized by a maximally. Angt143a frequency switching speed in microwave signal generators page 2 of 7. Based on micro lambda wireless yig tuned filter devices, the mlbf series of benchtest filter assembliescovers a frequency range from 500 mhz to 50 ghz in both bandpass andbandreject versions. An apparatus and method for calibrating a yttriumirongarnet tuned filter ytf is disclosed.
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