Lc oscillator tutorial and tuned lc oscillator basics. The frequency of the output wave may be fixed or variable, depending on the oscillator design. Positive feedback amplifiers oscillators lc and crystal. First a 3db attenuator, just to make the rest look more like 50r. The superb linearity of these oscillators is contributed by the ideal design. Yig filters are used for their high q factors, typically between 100 and 200. Low phase noise gan hemt oscillator design based on highq. Wavetek 907 repair, yig oscillator teardown kerry d. A simple approach to yig oscillators vhf communications magazine. The wave shape and amplitude are determined by the design of the oscillator circuit and choice of component values. 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. Design of a 310 ghz low phase noise yigtuned oscillator. 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. The frequency of the oscillatory voltage depends upon the value of the inductance and capacitance in the lc tank circuit.
Replacing yigtuned oscillators with silicon by using an. Apr 10, 2011 yig based solutions are usually simpler since the yig oscillator can mask many design imperfections. And under the concept of modification of pcb rf in stellex see picture. The connections of a yig oscillator are shown in the circuit. Gigatronics has 30 years of design experience to support your custom yigtuned oscillator and driver applications. This discussion of amplifier design gives us some insight into how to design an oscillator from small signal sparameters. These units feature a novel coupling technique to provide maximum rf power output and a lower second harmonic and other spurious responses. The fracn can be used with a reference oscillator up to 50 mhz, and operates at a frequency of up to 6. We can provide yig oscillators with 40 dbc second harmonic. This resonator is coupled to a lownoise active device to create an oscillator. Controlled oscillators vco, except they require a constant tuning current rather than a constant voltage. It has interesting magnetic properties which allow it to perform as a tunable microwave filter for example. A spinwave filter made with an yttriumiron garnet yig film was used simultaneously as a frequency.
The yig sphere technology has been used for microwave oscillators for more than. Pdf design techniques that have been succcessfully used on the development of xband gaas fet yigtuned oscillators are presented. Including all types of yig tuned oscillators, yig, yig tuned, ryto, ryad, rydd, analog driver, digital driver. Despite a small degradation in phase noise, the simplicity facilitated with electronic tuning motivates this design for practical applications. These different yig oscillator topologies are depicted in the figure1 above. The yig sphere behaves like a resonator with to8000 unloaded q resulting in very good frequency stability. Sep, 2011 hi pete b the 50867500 is a dual yig oscillator that is a sealed microcircuit and is not field repairable. The omniyig yom series provides fundamental yig tuned oscillator designs electronically tuned in octave and multi octave bands. Its hard to get a system to tune an octave or more and keep things like that from popping up. 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. Although the common gate fet yig oscillator has be tter phase noise than most other technologies e. The average output power of the yig is dbm in my frequency span of interest.
Tms has extensive experience in the design, manufacture, and management of large. This additional material on yig technology just in from james, a semiconductor guy with some rf test experience. The design of one yig oscillator is not readily scalable to a nonstandard package or frequency. The problem is the correct design of the current driver coil fm and tune. The omniyig yom series provides fundamental yigtuned oscillator designs electronically tuned in octave and multi octave bands. Switched or tuned filters of some sort generally creep into the design. The following is a list of parts needed for this part of the tutorial lesson. 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. Pdf design theory for broadband yigtuned fet oscillators. Yigtuned oscillator design on printed circuit board using. Hp modular products are designed to be cascaded in a 50 microstrip system. A sphere made from a single crystal of synthetic yttrium iron garnet acts as a resonator.
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. 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. Tunedinput and tunedoutput oscillator tunedoutput tunedinput feedback coupling ci rf output c 2 c 1 l 1 2 c co c l 2 1 2 0 2 1 1 l c f s. 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. The minimum output power from this device operating into a. The common gate fet oscillator circuit is the most common yig oscillator topology.
Yttrium iron garnet spheres yig spheres serve as magnetically tunable filters and resonators for microwave frequencies. A magnetically tunable microwave spinwave photonic oscillator was designed and modeled. The yig ball, which sits at the tip of a short ceramic rod, is positioned in the middle of a coupling coil u bolt. I have put some thought into this, and i plan to do it like this. The resonator in a yig tuned oscillator yto is a sphere of. From the picture below, you can clearly see the orthogonal coupling wires around the yig sphere click to see the picture in higher resolution.
A spinwave filter made with an yttriumiron garnet yig film was used simultaneously as a. The commongate fet oscillator circuit is the most common yig oscillator topology. Aug 03, 2014 the center of the yig oscillator is protected and shielded by a small piece of copper on the top. Yig oscillator basics yig oscillator app note,vendors. Yigbased solutions are usually simpler since the yig oscillator can mask many design imperfections. The primary objective of this tutorial lesson is to underline the challenges of analyzing oscillator circuits. Broadband, electronics, frequency synthesiser, microwave, microwave circuit design, microwave packaging.
A miniaturised wideband frequency synthesiser qut eprints. A technique for designing yig yttriumiron garnet tuned transistor oscillators, tunable over the range of frequencies from 500 to 950 mhz, is presented. Oscillator designguide reference this manuals provides reference information on the use of the oscillator designguide. Attime t o,weclosethe switch,s,therebyconnectingthecapacitoracrosstheinductor,l. Experimenting with a stellex yig oscillator overview stellex 6755. After carefully removing the thin copper cap, we can see the core of the yig oscillator. 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. Because of high frequencies, small inductance can be used for the radio frequency of oscillation. Jii packard slide 10 tunable oscillators vco and yig tunable oscillators lnp. A similar oscillator with a mechanicall y tuned cavity has about 3 db better phase noise. Also, aspecial design enablesveryfasttuning with a 3dbbandwidth of typically 2. If you let me know what measurements youd like i can take some for you. Teledyne microwave solutions is pioneer in design, development and manufacturing of yig oscillators. Simple conceptual oscillator i assumethecapacitorcischargeduptoastaticvoltagevo.
We did not publish schematics for these microcircuits. They have a stand ard pin configuration, which is almost always the same fig. Permanent magnet and electromagnetic yigtuned oscillators. The center of the yig oscillator is protected and shielded by a small piece of copper on the top. This yig resonator is influenced by the magnetic field that is generated by the tuning coils. A typical analogdriver control input of 0 to 10 v tunes the oscillator over the full frequency band. 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. 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. We report here on the design and construction of a yig tuned fet oscillator tunable over the entire 818ghz frequency range.
Yig oscillator50867500 schematic for 83752b keysight. 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. Tuned oscillator is a circuit that generates a radio frequency output by using lc tuned resonant circuit. The minimum output power from this device operating into a 50omega. Yigtuned oscillators provide the lowest phase noise for broadband microwave applications. The combination of the high q and broadband tuning range of the. The yig oscillator at 10 ghz is a commercial one that allows voltage tuning over a 1ghz range. Miniaturizedstandard and fast switching multioctave designs. In this tutorial you will build and test a high frequency colpitts oscillator using a parallel resonant lc circuit. Raditek providing high quality, low cost wireless and microwave products. Yig is a ferrite with very high resistivity and a sharp ferrimagnetic resonance.
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. Oscillator design using modern nonlinear cae techniques fliohewlett 3 i. Microwave synthesizer modules yigtuned filters yigtuned. Yig drivers for the above models are supplied in one integral package with oscillator. Replacing yigtuned oscillators with silicon by using an ultrawideband pllvco with precision phase control. November 20, 2000 10 ghz phaselocked yig source rev. Lecture 15 microwave oscillator design microwave active.
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