Rubidium atomic oscillator cuts down on noise

The IQRB-2 – the latest high-performance rubidium oscillator from IQD – delivers low phase noise of -112dBc/Hz at 1Hz and -158dBc/Hz at 10kHz. It is housed in a 95.5 x 62.5 x 44.3mm 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 oven controlled crystal oscillator (OCXO) at 0.002ppb/s at 100s, this model is suitable for frequency calibration, long- term evolution base stations, high-speed wireless communications and surveillance applications.

Based on an atomic clock, the IQRB-2 delivers an accuracy of ±0.3ppb irrespective of temperature fluctuations from -20 to 65°C and operates at a standard frequency of 10MHz with a Sinewave 50Ω output.

The ageing is ±0.05ppb per month and the IQRB-2 has a voltage control option to give a controllable frequency tuning of ±2ppb max. The module is specified with a supply voltage of 12V, although the product will operate over a voltage range of 12V to 18V, with a power consumption of 6W when stabilised and a warm-up time of typically 5 minutes.

The device can be operated over a temperature range of -20 to +65°C and mean time between failure is approximately 100,000 hours.


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