Low phase noise rubidium atomic oscillator module

January 17, 2017 // By Graham Prophet
IQD's IQRB-2 rubidium oscillator delivers phase noise of -112 dBc/Hz at 1 Hz and -158 dBc/Hz at 10 kHz. It is housed in a 95.5 x 62.5 x 44.3mm module so can be used in a 1U rack.

Electrical connections to the module 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 0.002 ppb/sec at 100 sec, this model is suitable for frequency calibration, Long Term Evolution (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 outputs a standard frequency of 10 MHz with a sinewave 50Ω 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 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 +65C and Mean Time Between Failure (MTBF) is approximately 100,000 hours.


IQD; www.iqdfrequencyproducts.com