The Phase Locked Dielectric Resonator Oscillators (PLDRO) provides the best combination of ultra-low phase noise and excellent frequency stability when it is phase locked to a clean and stable crystal reference signal. The PLDRO series of Polaris provides ideal signal sources for commercial and military systems requiring ultra-low phase noise, low spurious and high frequency stability.

There are three types of PLDRO series at Polaris, such as Single Loop PLDRO, Single Loop Digital-PLDRO, and Dual Loop PLDRO.

The Single Loop Digital-PLDRO provides output frequency with very fine frequency resolution of 10KHz (1KHz optional) using DDS(Direct Digital Synthesizer) and Mixer. Also, it is possible to provide output frequency that is a prime number. Because VCXO is not used in this product family, it has the advantage of being able to develop products of various frequencies at a lower cost in a shorter period of time compared with Dual Loop PLDRO using VCXO.



●  Very fine frequency resolution of 10KHz
●  Phase shift using DDS & mixer
●  Ultra low Phase Noise: -117dBc/Hz at 10KHz offset at 10GHz
●  Low spurious: -80dBc maximum
●  Phase-locked alarm
●  High efficient DC-DC converter
●  Internal voltage regulators
●  Compact package (W x L x H): 2.25″[57.15] x 3.15″[80] x 1.06″[27]
●  Low microphonics
●  Affordable price



●  High stability internal reference
●  Higher output power
●  Frequency resolution of 1KHz
●  +8VDC supply
●  Extended operating temperature
●  Field replaceable connectors
●  Customized outlines
●  Laser marking

Outline Drawing


* End user phase noise dependent on external reference phase noise for offset < 100KHz.

  Single Loop Digital-PLDRO