New Precision OCXOs Provide Ultra Low Phase Noise (ULPN) and Low G-Sensitivity (LGS)

By the usage of self-manufactured noise-optimized SC-cut crystals and noise-minimized electronic circuits KVG’s engineers succeeded in designing new OCXOs what provide beside a very high frequency stability an exceptional ULTRA low phase noise (ULPN) and in addition low G-sensitivity (LGS).

For high-frequency crystal oscillators locked to a frequency-reference the phase-noise (PN) in the frequency-range above the PLL-loop bandwidth is particularly important, because phase-noise is determined by the locked oscillator and not by the reference-signal.

The new 100 MHz OCXOs - O-30-ULPN-100M – gives a “Noise Floor” for better than -185 dBc/Hz at 100 kHz offset. At 10 kHz offset the phase-noise is already better than -180 dBc/Hz and near to the carrier O-30-ULPN-100M gives a very good performance with -135 dBc/Hz at 100 Hz offset.

A very good robustness against vibration is very important for oscillators with very good phase-noise, to avoid a significant performance degradation due to “vibration-induced” phase-modulation. The dynamic G-sensitivity of the new OCXO is less than 1 ppb/g (1 x 10-9/g) for all axes, which means ten-times better than standard-OCXOs.

In addition to the excellent phase-noise and low G-sensitivity the O-30-ULPN-100M is characterized by a very good frequency stability vs. temperature of better than ±50 ppb (±5 x 10-8) in the temperature-range from -20 ºC to +70 ºC. For the extended temperature range from -40 ºC to +85 °C the frequency stability is better than ±200 ppb (±2 x 10-7).

The long term stability (aging) is typically better than ±2.0 ppm within 15 years. The OCXO provides a voltage controlled frequency-tuning with a sufficiently large tuning-range.

These new high-frequency OCXOs are dedicated for application in Test & Measurement Systems as well as Medical-industry (e.g. Magnetic Resonance – or Computed Tomography) and reference clock for microwave signal sources or radar systems. In general all application in GHz-range where phase-noise of reference-source is the determining factor for the performance of the complete system.

The oscillators will be delivered in a small hermetically sealed metal can packages either

(36 x 27 x16 mm) or (25 x 25 x 12.7 mm) for thru-hole mounting (see also pic 2&3). Due to the hermetically sealed package the OCXOs is suitable for humid environmental conditions.