A VCXO – Voltage Controlled Oscillator – is a reference timing component that is commonly used in telecom, consumer and industrial electronics. A VCXO differs from an XO (Oscillator) in that it offers an capability to “fine-tune” the output frequenc (more)
A VCXO – Voltage Controlled Oscillator – is a reference timing component that is commonly used in telecom, consumer and industrial electronics. A VCXO differs from an XO (Oscillator) in that it offers an capability to “fine-tune” the output frequency within a certain range, after the device is already populated in a system. This capability is not available on XOs. (less)
SiTime’s MEMS oscillators simplify system designs and open the door to new applications. Though an LC oscillator will operate at any frequency within its range, they do not operate beyond approximately 200 MHz. SiTime’s single-ended LVTTL/CMOS com (more)
SiTime’s MEMS oscillators simplify system designs and open the door to new applications. Though an LC oscillator will operate at any frequency within its range, they do not operate beyond approximately 200 MHz. SiTime’s single-ended LVTTL/CMOS compatible MEMS oscillators operate at any frequency up to 220 MHz and the differential oscillator family expands the frequency to 800 MHz. (less)
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SiTime
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"A TCXO is a Temperature Compensated Oscillator.
The frequency stability (variation of frequency) of quartz oscillators varies significantly with temperature changes."
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SiTime
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MEMS oscillators offer very high performance – stability as good as 0.5 PPM over the industrial temperature range, 500 femtoseconds of integrated RMS phase jitter.
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SiTime
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The digital electronics era introduced a fundamental change in electronic circuit operation – most circuits were now being clocked synchronously. The clock oscillator became more important as it provided the reference timing to all these circuits.
Slide 1: The Unique Features and Benefits of Silicon MEMS Differential Oscillators
A differential oscillator is used as reference timing sources in very high performance electronic systems. Typically, differential oscillators have a frequency in excess of 100 MHz, though frequencies below that are also occasionally used. There are a couple of reasons why differential oscillators are used in electronic systems. First – a differential output eliminates common mode noise, which is important in very high performance, highspeed systems. Another reason for using a differential oscillator is that it offers more robustness against power supply noise – and therefore, offers a higher Power Supply Rejection Ratio (PSRR). These two capabilities are especially useful in serial data protocols that transfer data in excess of 6 Gigabits per second. Historically, a differential oscillator is made of a quartz resonator, married to a fixed frequency analog circuit (oscillator). The quartz resonator operates in either fundamental or overtone mode, and generates resonance at the target frequency of oscillation. The clock output from the oscillator goes through output conditioning, and appears as LVPECL, LVDS, CML or HCSL outputs on the device. LVPECL and LVDS are the most popular signaling standards in differential oscillators, with LVDS getting more adoption in the recent past because of its lower power consumption. A Silicon MEMS differential oscillator uses a MEMS resonator operating at a fundamental frequency of resonance, which is married to an analog circuit consisting of an oscillator, a PLL and various other functions. Most of the Silicon MEMS differential oscillators are programmable, i.e. their frequencies, voltages, stabilities, output signaling type and control pin can be configured exactly to the customer’s specification. Because Silicon MEMS timing companies use the fabless semiconductor model, samples of these customized devices are available in less than a week, and production is available in 3-5 weeks, both of which are very important for accelerating time to revenue. Another unique advantage of Silicon MEMS differential oscillators is its ability to offer very high frequencies and stabilities at very low voltages, without resorting to overtone and SAW technology. Therefore, they eliminate the startup issues that are associated with overtone oscillators, and they offer significantly better stability than SAW oscillators, as low as 10 PPM, which is not available from SAW. In addition, their aging is also significantly better than SAW oscillators. With all these benefits, it’s no wonder that Silicon MEMS differential oscillators are gaining significant traction against quartz oscillators and are replacing the latter in storage, networking and telecom applications. Learn more about :- Voltage Controlled Oscillator , TCXO , Crystal Oscillator & MEMS oscillators
