Rubidium atomic oscillator module for low phase noise applications

January 16, 2017 // By Jean-Pierre Joosting
The IQRB-2 high performance rubidium oscillator, from IQD, delivers low phase noise of -112 dBc/Hz at 1 Hz and -158 dBc/Hz at 10 kHz.

The oscillator is housed in a 95.5- x 62.5- x 44.3-mm module so can be used in a 1U rack. The electrical connections include an SMA connector for RF output, RS232 connectors RX & TX, a voltage control input and a frequency locked monitor. With a short term stability 100 times better than a typical OCXO at 0.02 ppb/s at 100s, this model is ideal for frequency calibration, LTE base stations, high speed wireless communications and surveillance applications.

Based around an atomic clock, the IQRB-2 delivers an accuracy of ±0.3 ppb irrespective of temperature fluctuations from -20 to 65°C and operates at a standard frequency of 10 MHz with a Sinewave 50 Ω output. The ageing is ±0.05 ppb per month and the IQRB-2 has a voltage control option to give a controllable frequency tuning of ±2 ppb maximum.

The module is specified with a supply voltage of 12 V, although the product will operate over a voltage range of 12 V to 18 V, with a power consumption of 6 W when stabilised and a warm up time of typically 5 minutes. The device can be operated over a temperature range of -20 to +65ºC and Mean Time Between Failure (MTBF) is approximately 100,000 hours.