I have to know the application field of constant temperature crystal oscillator
1. Frequency accuracy: According to the specified conditions, the maximum allowable deviation of the frequency of the crystal oscillator relative to its specified nominal value is tested at the reference temperature, ie (f-f0)/f0;
2. Frequency-temperature stability: The allowable frequency offset value of the maximum variation of the output frequency of the crystal oscillator in the specified temperature range relative to the sum of the output frequency extremes in the specified temperature range, ie ±(fmax-fmin) ) / (fmax + fmin);
3. Frequency aging: The change of the crystal oscillator output frequency with time is usually measured by the frequency of a certain time interval. Such as a total change from 0 to 30 days or a predetermined total frequency change within one year;
4. Operating temperature range: The oscillator can work normally. The frequency range and other performances do not exceed the specified allowable deviation temperature range;
5. Stabilization time: the time required for the oscillator to be energized from initial power to stable operation at the specified limit value;
6. Phase noise: refers to the ratio of signal power to noise power (C/N), which is a technical indicator for characterizing frequency jitter. The phase noise is measured in units of 1 Hz bandwidth at a predetermined compensation for the expected signal;
7. Spectrum purity: A frequency domain measure of frequency stability, which is usually expressed in terms of the noise power per Hz bandwidth in the noise power spectrum of the signal sideband relative to the total signal power.
8. Harmonic distortion: non-linear distortion described by the unwanted relationship between the spectral components of the signal and the harmonics of the wanted signal frequency;
9. Reproducibility: The ability of the oscillator to return to the original frequency after a certain period of time and then power up for a period of time;
10. Output power: The electric energy consumed by the oscillator under the specified voltage and the specified load, expressed by the product of voltage and current consumption;
11. Output voltage (sine wave): After applying the specified voltage and load, after reaching the stability within the specified time, use the effective value measured by the RF meter or measure the effective value of the voltage peak-to-peak value with an oscilloscope.
The constant temperature crystal oscillator is referred to as the constant temperature crystal oscillator. The English abbreviation is OCXO (Oven Controlled Crystal Oscillator). The temperature of the quartz crystal resonator in the crystal oscillator is kept constant by the constant temperature bath, and the variation of the oscillator output frequency caused by the change of the ambient temperature is reduced. To the smallest crystal oscillator. The OCXO is composed of a thermostat control circuit and an oscillator circuit. Usually, people use a differential series amplifier composed of a thermistor "bridge" to achieve temperature control.
1) Military and aerospace fields: communication and navigation, enemy and enemy identifiers, radar, sensors, guidance systems, fuzes, electronic warfare, sonar;
2) Scientific research and measurement: atomic clock, measuring equipment, telemetry, remote sensing, remote control;
3) Industrial areas: communications, telecommunications, mobile/cellular/portable terminals, aerospace, marine, navigation, instrumentation, computers, digital devices, displays, disk drives, modems, identification/authentication systems, sensors;
4) Consumers: watches and clocks, cellular and cordless telephones, ordinary telephones, pagers, audio equipment, cable television systems and televisions, PCs, video cameras, amateur radio equipment, toys, medical devices and equipment;
5) Automotive field: engine control, stereo clock, sensor, driving computer, GPS application.
3 constant temperature crystal oscillator terminology1) Frequency accuracy: According to the specified conditions, the maximum allowable deviation of the frequency of the crystal oscillator relative to its specified nominal value is tested at the reference temperature, ie (f-f0)/f0;
2) Frequency-temperature stability: The allowable frequency offset value of the maximum variation of the output frequency of the crystal oscillator in the specified temperature range relative to the sum of the output frequency extremes in the specified temperature range, ie ±(fmax-fmin) ) / (fmax + fmin);
3) Frequency aging: The crystal oscillator output frequency changes with time, usually measured by the frequency of a certain time interval. Such as a total change from 0 to 30 days or a predetermined total frequency change within one year;
4) Operating temperature range: The oscillator can work normally. The frequency range and other performances do not exceed the specified allowable deviation temperature range;
5) Stabilization time: the time required for the oscillator to be energized from initial power to stable operation at the specified limit value;
6) Phase noise: refers to the ratio of signal power to noise power (C/N), which is a technical indicator for characterizing frequency jitter. The phase noise is measured in units of 1 Hz bandwidth at a predetermined compensation for the expected signal;
7) Spectral purity: A frequency domain measure of frequency stability, which is usually expressed in terms of the noise power per Hz bandwidth in the noise power spectrum of the signal sideband relative to the total signal power.
8) Harmonic distortion: non-linear distortion described by the unwanted harmonic relationship between the spectral components of the signal and the frequency of the wanted signal;
9) Reproducibility: The ability of the oscillator to return to the original frequency after a certain period of time and then power up for a period of time;
10) Output power: The electric energy consumed by the oscillator under the specified voltage and the specified load, expressed as the product of the voltage and the current consumption;
11) Output voltage (sine wave): After applying the specified voltage and load, after reaching the stability within the specified time, use the effective value measured by the RF meter or measure the effective value of the voltage peak-to-peak value with an oscilloscope.
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