Silicon Mems Vcxo Surpasses Quartz

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Quartz has been the predominant technology of choice for timing references. Quartz oscillators consist of piezoelectric crystals with analog circuits in ceramic packages. They provide accurate and stable clocks that meet the requirements of most electronic applications. However, they have many inherent limitations, such as:

* Long lead times and lack of easy availability, due to complex manufacturing
* Lack of customization due to inflexibility
* Quality and performance variations over different lots and over different manufacturers
* Lack of integration

As semiconductors have grown in popularity, electronics manufacturers have turned to Silicon MEMS Timing solutions for their clocking needs. Silicon MEMS Timing solutions provide the following benefits:

* Better availability and short lead times through semiconductor manufacturing infrastructure
* Easy customization due to programmability
* Consistently high quality and reliability
* Significant integration
* High performance, particularly for high speed serial interfaces and programmable logic (FPGAs).

In the case of VCXOs (Voltage Controlled Oscillators), the benefits of MEMS solutions become even more evident. Below is a comparison of Quartz based VCXOs vs. Silicon MEMS VCXOs, which shows that MEMS is clearly superior to Quartz.

Quartz VCXO

* Core Technology - Pullable Crystals
* RMS Integrated Phase Jitter (12kHz 20MHz) - < 1ps
* Frequency Offering - 10-15 standard frequencies (< 60 MHz)
* Pull Range - 50PPM, 100PPM, 200PPM
* Pull Range Linearity - 10%
* Tuning Slope (Kv) Consistency Poor Consistency
* Drive Strength for Impedance Matching, EMI Reduction - Not Available
* Product Coverage - Limited options for 1.8V, pull range or 3225 package
* Lead Time - 8-12 weeks for standard device & 16 weeks for non-standard device

MEMS VCXO

* Core Technology - All-Silicon MEMS
* Integrated Phase Jitter (12kHz 20MHz) - < 1ps
* Frequency Offering - Any frequency up to 800MHz
* Pull Range - up to 1600 PPM
* Pull Range Linearity -

About the Author:
Know more about- Voltage Controlled Oscillator, VCXO, Clock Generator



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