What if I told you that specifying more Electronic Frequency Control (EFC) than you need could actually be hurting your pocketbook? Well, it very well may be! Paying attention to whether your supplier is using AT cut vs SC cut crystals will help you save money in the long run with OCXOs.
Precise timing across a variety of networks and industries is becoming a necessity. Both operationally and legally. It's actually pretty amazing to see the evolution of timing & frequency control throughout different industries. There's been significant timing innovations over the past 5-10 years alone.
Do you know all about Atomic Clocks in space and how they work? If not, it's about TIME you do. (Haha. Ha. Ha...)
Timing is everything when it comes to GPS satellites and other space applications. Even just a one microsecond error in timing can lead to an error of 300 meters on the ground. Atomic clocks can maintain very precise timing, making them a great timing solution for GPS and other LEO satellites.
Want to know what's better than a crystal oscillator? A crystal oscillator combined with Electronic Frequency Control (EFC). Of course, it really comes down to your specific application and what requirements you're looking for to determine if EFC would be a good addition to your crystal oscillator circuit design, and if so, which method is best for you.
There are 4 options to choose from when selecting an Electronic Frequency Control method for your crystal oscillator. These 4 options are
- Pulse Width Modulation & Low Pass Filter
- Reference RF Signal & Phase Locked Loop (PLL)
- Voltage Divide
- Digital-to-Analog Converter (DAC)
In this post, let's take a closer look at each option and compare the pros and cons between them.
Surface Acoustic Wave (SAW) filters offer a reduced size, weight, & cost compared to other filter technologies. However, there are many tradeoffs that need to be considered when selecting a SAW filter for your system design.
What are SAW filters? What are some common SAW filter applications? How are SAW filters used for mobile communications? We'll answer these questions and more in this post.
Topics: RF Technology
GPS Disciplined Oscillators (GPSDO) are one of today's most trusted and accurate sources of timing. These powerful devices (sometimes called GPS clocks) consist of a high-quality stable oscillator and a GPS receiver. The GPSDO works by disciplining (or steering) the oscillator output to a GPS device or GNSS satellite signal via a tracking loop.
When it comes to stratum levels and minimum performance requirements for digital network synchronization, there's definitely a lot to know. A standard first released in 1987 entitled "Synchronization Interface Standards for Digital Networks" from the American National Standards Institute (ANSI) lays out all the official information and requirements.
Topics: RF Technology
Since the beginning of NASA, radio communication has been the go-to method of communication for spacecrafts. Well, that's about to change. NASA has recently announced they will be making a major change to some of their upcoming communication systems by implementing new, cutting-edge, laser communication technology.
A Berlin-based team known as PTScientists (Part Time Scientists) will be celebrating the 50th anniversary of the Apollo 11 moon landing in high-style in 2019. The group was a participant in the private race to the moon, the Google Lunar X Prize, which will wrap up this year without a winner. Their mission for 2019? To bring a 4G wireless mobile network to the moon!
RF engineers are aware that temperature variations are the most significant factor contributing to frequency drift in crystal oscillators. Other variables affecting frequency output, such as humidity and pressure, can be easily alleviated with a hermetically sealed packaging of the crystal in a vacuum, or in an inert gas such as nitrogen. Controlling temperature for precise frequency output in a crystal oscillator circuit, however, requires a higher level of electronic RF design ingenuity. Enter... The Oven Controlled Crystal Oscillator (OCXO).