Difference between MEMS Oscillator and Crystal Oscillator | MEMS Oscillator vs Crystal Oscillator
This page compares MEMS Oscillator vs Crystal Oscillator and mentions difference between MEMS Oscillator and Crystal Oscillator. We will take Si-MEMS Oscillator for comparison with Crystal oscillator.
The figure-1 depicts SI based MEMS oscillator structure. It uses silicon resonator as source of oscillation. It uses PLL circuit in order to correct the frequency mismatches produced due to tolerences while manufacturing as well as temperature drift. This is referred as frequency calibration also.
The figure-2 depicts crystal oscillator structure. As shown it uses simple oscillator circuit with quartz crystal operating in fundamental mode.
Following table mentions difference between Crystal Oscillator and MEMS Oscillator.
|Specifications||Crystal Oscillator||MEMS Oscillator|
|Structure||Simple||complex (resonator, PLL, temperature compensation part, calibration)|
|Phase Jitter (ps)||Lower||Higher|
|Power Consumption (mA)||Lower||Higher|
|Oscillator start up time||Low||High|
|Frequency stability||No frequency jumps; less variation||Frequency jumps; more variation|
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