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 Dual Loop PLDRO provides an output frequency whose phase is locked to an integer or fractional multiple of the external reference using PLCRO(Phase Locked Coaxial Resonator Oscillator) and frequency divider. This family of product offers a frequency resolution of 500 KHz, but if you need finer frequency resolution, please refer to Single Loop Digital-PLDRO. The Single Loop Digital-PLDRO provides very fine frequency resolution.



●  Frequency resolution of 500KHz
●  Ultra low phase noise: -120dBc/Hz at 10KHz offset at 10GHz
●  Low spurious: -80dBc maximum
●  Phase-locked alarm
●  Internal voltage regulators
●  Low power consumption
●  Compact package (W x L x H): 2.25″[57.15] x 2.25″[57.15] x 1.06″[27]
●  Low microphonics



●  High stability internal reference
●  Higher output power
●  +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.

  Dual Loop PLDRO