Low noise oscillators
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| Parameter |
TCXO (Temperature Compensated Crystal Oscillator) |
OCXO LQ (Oven-Controlled Crystal Oscillators) |
OCXO SQ | OCXO MQ | OCXO HQ | OCXO DHQ | Rubidium |
| short term stability (τ = 1 sec) |
2·10-9 | 1·10-9 | 5·10-10 | 2·10-10 | 5·10-12 | 2·10-12 | 2·10-11 |
|---|---|---|---|---|---|---|---|
| accuracy of PPS (pulse per sec) |
< ±100 nsec | < ±100 nsec | < ±50 nsec | < ±50 nsec | < ±50 nsec | < ±50 nsec | < ±50 nsec |
| phase noise | 1Hz -60dBc/Hz 10Hz -90dBc/Hz 100Hz -120dBc/Hz 1kHz -130dBc/Hz |
1Hz -60dBc/Hz 10Hz -90dBc/Hz 100Hz -120dBc/Hz 1kHz -130dBc/Hz |
1Hz -70dBc/Hz 10Hz -105dBc/Hz 100Hz -125dBc/Hz 1kHz -140dBc/Hz |
1Hz -75dBc/Hz 10Hz -110dBc/Hz 100Hz -130dBc/Hz 1kHz -140dBc/Hz |
1Hz < -85dBc/Hz 10Hz < -115dBc/Hz 100Hz < -130dBc/Hz 1kHz < -140dBc/Hz |
1Hz < -80dBc/Hz 10Hz < -110dBc/Hz 100Hz < -125dBc/Hz 1kHz < -135dBc/Hz |
1Hz -75dBc/Hz 10Hz -89dBc/Hz 100Hz -128dBc/Hz 1kHz -140dBc/Hz |
| accuracy free run, one day |
±1·10-7 ±1Hz (1) |
±2·10-8 ±0.2Hz (1) |
±5·10-9 ±50mHz (1) |
±1.5·10-9 ±15mHz (1) |
±5·10-10 ±5mHz (1) |
±1·10-10 ±1mHz (1) |
±2·10-11 ±0.2mHz (1) |
| accuracy free run, one year |
±1·10-6 ±10Hz (1) |
±4·10-7 ±4Hz (1) |
±2·10-7 ±2Hz (1) |
±1·10-7 ±1Hz (1) |
±5·10-8 ±0.5Hz (1) |
±1·10-8 ±0.1Hz (1) |
±5·10-10 ±5mHz (1) |
| accuracy GPS-synchronous, averaged 24h |
±1·10-11 | ±1·10-11 | ±1·10-11 | ±5·10-12 | ±1·10-12 | ±1·10-12 | ±1·10-12 |
| accuracy of time free run, one day |
± 4.3 msec | ± 865 µs | ± 220 µs | ± 65 µs | ± 22 µs | ± 4.5 µs | ± 1.1 µs |
| accuracy of time free run, one year |
± 16 s | ± 6.3 s | ± 4.7 s | ± 1.6 s | ± 788 ms | ± 158 ms | ± 8 ms |
Note 1:
The accuracy in Hertz is based on the standard frequency of 10 MHz. For example: Accuracy of TCXO (free run one day) is ±1·10-7·10MHz = ± 1 HZ
The given values for the accuracy of frequency and time (not short term accuracy) are only valid for a constant ambient temperature !
A minimum time of 24 hours of GPS-syncronicity is required before free run starts.
