This additional material on yig technology just in from james, a semiconductor guy with some rf test experience. Lc oscillator tutorial and tuned lc oscillator basics. We did not publish schematics for these microcircuits. Micro lambda wireless offers the largest yig tuned oscillator product line in the market today including permanent magnet and electromagnetic designs covering frequency ranges from 500 mhz to 44 ghz in your choice of narrow or wideband configurations.
The yig oscillator at 10 ghz is a commercial one that allows voltage tuning over a 1ghz range. Replacing yigtuned oscillators with silicon by using an. Yig oscillator50867500 schematic for 83752b keysight. General equivalent circuits for rf oscillators the procedure is to design an active negative resistance circuit which, under largesignal steadystate conditions, exactly cancels out the load and any other positive resistance in the closed loop. The yig sphere technology has been used for microwave oscillators for more than. A magnetically tunable microwave spinwave photonic oscillator was designed and modeled. A sphere made from a single crystal of synthetic yttrium iron garnet acts as a resonator.
Apr 10, 2011 yig based solutions are usually simpler since the yig oscillator can mask many design imperfections. Even with the yig, when you hit the output amps with a saturation level sort of input power, you may see more harmonic energy 10 dbc than you would like. A miniaturised wideband frequency synthesiser qut eprints. Experimenting with a stellex yig oscillator overview stellex 6755. Tms has extensive experience in the design, manufacture, and management of large.
Yigbased solutions are usually simpler since the yig oscillator can mask many design imperfections. One can easily achieve respectable phase noise performance with a fairly simple single or dualloop pll by tolerating the slow tuning speed, large size, high power consumption, and relatively high cost of a yig oscillator. Microwave synthesizer modules yigtuned filters yig. Because of high frequencies, small inductance can be used for the radio frequency of oscillation. A spinwave filter made with an yttriumiron garnet yig film was used simultaneously as a frequency. We now know that for resonance to occur in the tank circuit, there must be a frequency point were the value of x c, the capacitive reactance is the same as the value of x l, the inductive reactance x l x c and which will therefore cancel out each other out leaving. The average output power of the yig is dbm in my frequency span of interest. November 20, 2000 10 ghz phaselocked yig source rev. Raditek providing high quality, low cost wireless and microwave products. A spinwave filter made with an yttriumiron garnet yig film was used simultaneously as a. Controlled oscillators vco, except they require a constant tuning current rather than a constant voltage. Tuned oscillator is a circuit that generates a radio frequency output by using lc tuned resonant circuit. Oscillator design using modern nonlinear cae techniques fliohewlett 3 i. Hp modular products are designed to be cascaded in a 50 microstrip system.
Its hard to get a system to tune an octave or more and keep things like that from popping up. The frequency of the oscillatory voltage depends upon the value of the inductance and capacitance in the lc tank circuit. Synthesizers, voltage controlled oscillators, coaxial resonator oscillators, yig replacement oscillators, and various custom design signal sources engineering and design expertise providing leading edge synthesizer and vco solutions to our customers. The minimum output power from this device operating into a. Teledyne microwave solutions is pioneer in design, development and manufacturing of yig oscillators. Attime t o,weclosethe switch,s,therebyconnectingthecapacitoracrosstheinductor,l. It has interesting magnetic properties which allow it to perform as a tunable microwave filter for example. Oscillator design guide structure the oscillator designguide is integrated into agilent eesofs advanced design system environment, working as a smart library and interactive handbook for the creation of useful.
These different yig oscillator topologies are depicted in the figure1 above. Simple conceptual oscillator i assumethecapacitorcischargeduptoastaticvoltagevo. Microwave synthesizer modules yigtuned filters yigtuned. I have put some thought into this, and i plan to do it like this.
In this paper, a yigtuned oscillator with low phase noise is designed successfully, the frequency range of 3 to 10 ghz, which is based on the theory of oscillation phase noise model and yttrium iron garnet yig spheres characteristic. Yig is a ferrite with very high resistivity and a sharp ferrimagnetic resonance. Permanent magnet and electromagnetic yigtuned oscillators. We can provide yig oscillators with 40 dbc second harmonic. Lecture 15 microwave oscillator design microwave active. Yig oscillator basics yig oscillator app note,vendors. Design of a 310 ghz low phase noise yigtuned oscillator. Yigtuned oscillators provide the lowest phase noise for broadband microwave applications. If you let me know what measurements youd like i can take some for you. Replacing yigtuned oscillators with silicon by using an ultrawideband pllvco with precision phase control. Pdf design theory for broadband yigtuned fet oscillators. Including all types of yig tuned oscillators, yig, yig tuned, ryto, ryad, rydd, analog driver, digital driver. We report here on the design and construction of a yig tuned fet oscillator tunable over the entire 818ghz frequency range.
Despite a small degradation in phase noise, the simplicity facilitated with electronic tuning motivates this design for practical applications. Also, aspecial design enablesveryfasttuning with a 3dbbandwidth of typically 2. Yttrium iron garnet spheres yig spheres serve as magnetically tunable filters and resonators for microwave frequencies. The problem is the correct design of the current driver coil fm and tune. Miniaturizedstandard and fast switching multioctave designs. The superb linearity of these oscillators is contributed by the ideal design. The wave shape and amplitude are determined by the design of the oscillator circuit and choice of component values. The commongate fet oscillator circuit is the most common yig oscillator topology. A similar oscillator with a mechanicall y tuned cavity has about 3 db better phase noise.
The omniyig yom series provides fundamental yig tuned oscillator designs electronically tuned in octave and multi octave bands. A technique for designing yig yttriumiron garnet tuned transistor oscillators, tunable over the range of frequencies from 500 to 950 mhz, is presented. In this tutorial you will build and test a high frequency colpitts oscillator using a parallel resonant lc circuit. First a 3db attenuator, just to make the rest look more like 50r.
Wavetek 907 repair, yig oscillator teardown kerry d. The minimum output power from this device operating into a 50omega. Oscillator designguide reference this manuals provides reference information on the use of the oscillator designguide. The fracn can be used with a reference oscillator up to 50 mhz, and operates at a frequency of up to 6. Jii packard slide 10 tunable oscillators vco and yig tunable oscillators lnp. Yig tuned oscillator yto for a very wide band that can reach decade tuning with high frequency stability and for frequency range of 1 ghz to 50 ghz. If we can design an amplifier for which k pdf rf and microwave instruments, such as signal and network analyzers, require wideband, swept frequency signals to make many of their basic measurements. Pdf design techniques that have been succcessfully used on the development of xband gaas fet yigtuned oscillators are presented. This resonator is coupled to a lownoise active device to create an oscillator. Although the common gate fet yig oscillator has be tter phase noise than most other technologies e. Teledyne defense electronics, llc with a 30 year heritage in yig technology, tms has unsurpassed capabilities as your single source for yig oscillators and offers best in industry low phase noise. The design of one yig oscillator is not readily scalable to a nonstandard package or frequency. The resonator in a yig tuned oscillator yto is a sphere of. The connections of a yig oscillator are shown in the circuit.
These units feature a novel coupling technique to provide maximum rf power output and a lower second harmonic and other spurious responses. This yig resonator is influenced by the magnetic field that is generated by the tuning coils. They have a stand ard pin configuration, which is almost always the same fig. The following is a list of parts needed for this part of the tutorial lesson. The frequency of the output wave may be fixed or variable, depending on the oscillator design. Yig drivers for the above models are supplied in one integral package with oscillator. Yigtuned oscillator design on printed circuit board using.
After carefully removing the thin copper cap, we can see the core of the yig oscillator. The omniyig yom series provides fundamental yigtuned oscillator designs electronically tuned in octave and multi octave bands. The yig ball, which sits at the tip of a short ceramic rod, is positioned in the middle of a coupling coil u bolt. Sep, 2011 hi pete b the 50867500 is a dual yig oscillator that is a sealed microcircuit and is not field repairable. A simple approach to yig oscillators vhf communications magazine. From the picture below, you can clearly see the orthogonal coupling wires around the yig sphere click to see the picture in higher resolution. Positive feedback amplifiers oscillators lc and crystal.
Yig filters are used for their high q factors, typically between 100 and 200. Gigatronics has 30 years of design experience to support your custom yigtuned oscillator and driver applications. The center of the yig oscillator is protected and shielded by a small piece of copper on the top. This discussion of amplifier design gives us some insight into how to design an oscillator from small signal sparameters. Micro lambda wireless offers the largest yigtuned oscillator product line in the market today including permanent magnet and electromagnetic designs covering frequency ranges from 500 mhz to 44 ghz in your choice of narrow or wideband configurations. The yig sphere behaves like a resonator with to8000 unloaded q resulting in very good frequency stability. And under the concept of modification of pcb rf in stellex see picture. Broadband, electronics, frequency synthesiser, microwave, microwave circuit design, microwave packaging.