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XCO3.php    4570 Bytes    23-04-2024 14:34:57


XCO3 - A low cost Crystal Oscillator Module


For any standard 7 x 5 mm Oscillator






The assembled prototype




✈ Motivation • Design Criteria




On one hand, we wanted a calibrated Source for the EMC-Precompliance Setup. On the other hand, a Source to study the Harmonics of a Standard Crystal Oscillator was desirable.

This is a board to house any 7 x 5 mm Crystal Oscillator. A Voltage Regulator supplies it with a stable 3.3 V / 5 V, max. 100 mA. We used the SO-8 78LXX type Voltage Regulator for that.

In order to use 50 Ω Measurement Gear, a massive Output Divider (30 dB) does this matching thing, without loading the Oscillator too much.




✈ Downloads








✈ Performance • 4.096 MHz





The CMOS oscillator creates beautiful Harmonics (FSP is 50Ω)




Whilst in the time domain it is close to a squarewave (SCOPE is Hi-Z)




✈ Share your thoughts



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t1 = 6586 d

t2 = 181 ms

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