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IQD VCTCXO meets LTE-A, WCDMA, small cell synchronisation challenges

  • Author:Ella Cai
  • Release on :2017-09-28
IQD’s  low jitter, tight stability IQXT-316 series VCTCXO uses proprietary ASIC technology to meet the tight short and medium term stability requirements (±50ppb to ±250ppb depending on the operating temperature range) required for packet network synchronisation for small cells.

This, combined with slope performance as low as ±20ppb/degrees and low power consumption makes the IQXT-316 suitable for small cell synchronisation requirements.

To meet network interface requirements such as 10GE etc, the IQXT-316 series delivers RMS phase jitter down to 280fs over 12kHz to 5MHz and low phase noise of -157dBc/Hz @100kHz to meet the radio interface requirements of LTE-A (TS36.104) and WCDMA (TS25.104) transceivers.

This enables a single device to be used for both functions. The new model also offers  short term ageing of ±20ppb max per day and long term ageing of ±3ppm max over 10 years.

The VCTCXO option includes a patented varactor linearisation circuit which removes the effects of tilt and the oscillator can be pulled between ±5ppm to ±12ppm with a control voltage of 1.5V ±1V and an input impedance of 100k Ohms minimum.

Housed in a 7 x 5mm 6-pad package, the IQXT-316 series operates over a temperature range of -40 to +85 degrees and is available with an output of HCMOS, 15pF load or clipped sinewave into 10k Ohms load and with a current draw down to 2mA and standard supply voltages of 2.8, 3.0 and 3.3V.

Seven frequencies have been developed: 19.2MHz, 24.576MHz, 25.0MHz, 26.0MHz, 30.72MHz, 38.4MHz and 40.0MHz, all standard within small cell synchronisation applications and a range have been approved with a number of chipset manufacturers


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