Frequency Management International Oscillator Products

Frequency Management (FMI)

FMI is a global leader in the design and manufacturing of high reliability – extreme environment and industrial grade – frequency control and hybrid electronic solutions. 

Committed to the industry’s highest level of service and total customer satisfaction, FMI helps customers achieve competitive advantages and strategic differentiation in their product applications

Targeting both New System Designs and Legacy Replacements Complies to Operating Conditions Beyond Industry Standards Solutions for new Jet Engine Controllers and Sensors at Higher Operating Temperatures 

FMI uses the smallest available product footprints with Lowest Available Power Consumption achieving reliable  Fixed, Variable, & Multiple Frequency Low Phase Jitter 

QPL Oscillators

FMI has successfully completed the certification of MIL-PRF-55310 /41, which is the latest and the smallest of all Hi-Rel hybrid crystal oscillators that DLA has qualified.

The approval represents FMI’s most recent achievement and is thefirst DLA-certified miniature 5x7mm form-factor oscillator design listed under MIL-PRF-55310, providing low voltage CMOS oscillators in the frequency range of 500 kHz to 125 MHz.

Not only has FMI achieved the certification, they helped DLA to first create the specifications according to commonly required performance standards but now in a much smaller 5x7mm (gullwing style) package.

Note that /41 denoted 3.3V which caters to the newer designs (as opposed to 5V).

Also note that gullwing style leads offer the following important characteristics:

1-        It offers a full view of the soldering contact between the PCB and the leads. This is superior to any larger package with J-leads where the solder contact area is hidden under the package of the product

2-        The gullwing configuration offers a more thermally compliant lead positioning according to our NASA customers that have selected this type of lead forming compared to any other.

3-        The /41 package size is indeed the smallest among the QPL offering and is significantly lighter which makes it more suitable for any Hi-Rel system  application requiring performance of the part under shock and vibration

4-        This 5×7 gullwing package’s land pattern accepts both 9×14 and 9×7 packages, examples:
M55310/30                9×14       CMOS   3.3V       450 KHz to 100 MHz
M55310/34                9×7         CMOS   3.3V       500 KHz to 150 MHz         Thickness 1
M55310/38                9×7         CMOS   3.3V       500 KHz to 150 MHz         Thickness 2

 It would be useful for our customers to know about the following attributes and properties of the /41 that FMI has qualified:

1-      The QPL certification is a reflection of the availability of this type of crystal oscillator  over the entire range of 500KHz to 125 MHz

2-      From the standard product perspective, our M88 is the closest to the military version of the QPL design (https://www.frequencymanagement.com/web_pdfs/cat_pdfs_space%20and%20military/FMI_M88_Issue%205_07272016.pdf)

3-      There are a range of other electrical parameters that are not be included in the QPL /41 specifications but we offer them-

a.       Phase noise (at a specific output frequency): Noise floor of -159dBc/Hz for 125MHz output

b.      RMS jitter for 12 KHz to 20 MHz offset : 100 fsec

4-      Waveform parameters other than what is listed on the /41 QPL spec including alternative rise/fall times and duty cycles

5-      Output frequency outside the range specified on QPL /41: we offer 250KHz to 200MHz

FMI products

  • Crystals, Oscillators, VCXOs, Temperature Sensors 
  • Voltage Options: 1.2V, 1.8V, 2.5V, 3.3V, 5V, and up to 15V 
  • Radiation Tolerance: from 10krad and Up 
  • COTS Alternatives Available 
  • Temperature Range: -180oC to +300oC 
  • High Shock and Vibration 
  • High Pressure Tolerant to 7,000 PSI 
  • CMOS/TTL, Sine-wave, LVPECL & LVDS 
  • Low Phase Jitter 
  • Facilitated Source Inspection Provisions 
  • Maximum Use of Established Reliability Components 
  • Rugged Design & Construction Optimized for Severe Environments 
  • Robust Manufacturing & Assembly Techniques 
  • Very Rugged Crystal Design and Mechanical Assembly 
  • Long Term Performance & Life Test Under Extreme Conditions 
  • Surface Mount and Thru-hole Package Options 

Kratos Oscillator Products

Kratos General Microwave

Digitally Tuned Oscillators (DTO)

Kratos General Microwave offers a line of DTOs covering the 2-18 GHz frequency range based upon its catalog line of broadband VCOs. The DTO provides the desired output frequency in response to a digital control signal. A block diagram of the DTO is shown in Fig. 1. By appropriate design of the electronic circuitry, settling times of less than 300 nanoseconds are achieved. To obtain a frequency accuracy of the order of ±1%, including the effects of temperature, a proportionally controlled heater is required for the VCO and the electronic circuitry is temperature-compensated. A latch mode is provided as a standard feature.

Multi-Band Frequency Locked Oscillator (FLO)

Kratos General Microwave has developed a new product line of Multi-Band Frequency Locked Oscillators (FLO). This product line is an enhancement to our free running Digitally Tuned Oscillator (DTO) products. This FLO combines the high speed of DTO with the high accuracy and long-term stability of a frequency locked source. The key specification feature of the FLO is a timing speed of less than 1μsec to settle within 1 MHz of the desired frequency.


The FLO was specifically designed for test systems and simulator applications. It is a low cost replacement for high cost direct synthesizers, in applications that the frequency setting time of 1 μsec is meeting the system requirements.    

Voltage Controlled Oscillators (VCO)

Kratos General Microwave has developed a family of high-speed, miniaturized VCOs covering the 2-6 GHz frequency range. These VCOs have been utilized in airborne EW applications, as well as in ground-based simulators.

Safran Timing Technologies

Atomic Clocks and Oscillators

Safran, with its Spectratime Brand, is a world leader in high-end crystal, rubidium, maser and integrated GPS/GNSS clocks, as well as related testing instrument technologies for space missions that rely on high precision atomic clock technology. 

The products include: 

Rubidium Oscillators

The Spectratime mRO-50 is a breakthrough low SWaP-C Miniaturized Rubidium Oscillator designed to meet the latest commercial, military and aerospace requirements where time stability and power consumption are critical.

It provides a one day holdover below 1µs and a retrace below 1 x 10-10 in a form factor (50.8 x 50.8 x 19.5mm) that takes up only 51 cc of volume (about one-third of the volume compared to standard rubidiums) and consumes only 0.45W of power, which is about ten times less than existing solutions with similar capabilities.

With these competitive advantages, the new Spectratime mRO-50 Miniaturized Rubidium Oscillator provides accurate frequency and precise time synchronization to mobile applications, such as military radio-pack systems in GNSS denied environments. Its wide-ranging operating temperature of -10°C to 60°C (military version extended to -40°C to 75°C) is also ideal for UAVs and underwater applications.

Space-Qualified Oscillator

The Spectratime MO is a cost-effective, high-performance, and space-qualified master crystal oscillator.

It’s designed with space technology to endure long lifetime and high reliability, withstanding harsh space applications

GPS/GNSS Synchronized OCXO/Rb Modules

The new, slim, ultra low noise SRO-5680 GPS/GNSS-disciplined rubidium oscillator (GPSDO) features an EMI-shielded, rugged packaging, while integrating complex synchronization functionality all in one low-cost, super-small package.

It is compatible with the FEI-5680 Rb model and utilizes the SmarTiming+® technology to provide a host of integrated GPS/GNSS disciplining and timing features. The SRO intelligently synchronizes, disciplines, and controls any primary 1PPS reference signal, such as GPS/GNSS, Cesium, Hydrogen Maser, and T1/E1, at cutting-edge 1ns resolution. Its slim and rugged packaging and ultra low noise features make it greatly suitable for next gen SATCOM, airborne and other stringent MIL applications.

GPS/GNSS Rb/Maser Standards


T4Science’s smart iMaser-3000 clock is a next generation of state-of-the-art, high-performance active hydrogen maser, integrating intelligent functionality in a compact, cost-effective and maintenance-free package.

Spectratime GNSSource-2500

The GNSSource™ is a low-cost, high-performance primary GPS/GNSS rubidium reference standard in a compact 1U package.

Clock Instruments for Test

The PicoTime-1U is a low-cost, high-performance clock ADEV (Allan Deviation) stability analyzer.

Synergy Oscillators: 

Synergy Microwave Corporation

Voltage Controlled Oscillator

VCO’s featuring excellent phase noise and available in planar, ceramic or SAW resonator construction and on most product utilizing our patented REL-PRO® technology surface mount footprint design. We can also customize an oscillator according to your specific requirements.

SAW Oscillators

Synergy’s SAW oscillators features excellent phase noise, small size surface mount and lead free REL-PRO® patented technology. We can also customize this VCOs according to your specific requirements.

 SAW oscillator

High Performance Crystal Oscillators

Synergy’s high performance oven controlled crystal oscillators features exceptional phase noise, fast warm-up time, low power consumption, tight frequency stability, excellent long-term stability, El. frequency tuning input, reference voltage output and small CO-8 or SMD package. We can also customize this VCOs according to your specific requirements.

Ultra-low Noise Phase Locked Oscillators

Synergy’s phase locked oscillators features ultra-low phase noise, no programming required, lead free REL-PRO® patented technology and is available in both surface mount and connectorized package. We can also customize these phase locked oscillators according to your specific requirements.

High Performance Dielectric Resonator Oscillator

Synergy’s high performance dielectric resonator oscillators(DRO) features exceptional phase noise, lead free REL-PRO® patented technology and is available in both surface mount and connectorized package. We can also customize these high performance dielectric resonator oscillators according to your specific requirements.