Equipment and Components for the RF and Microwave industry

Phase Locked Oscillators
External Reference APL - 03 Series

  • 400 MHz to 14 GHz
  • Fundamental Frequency (CRO or DRO)
  • External Reference
  • Small Size
  • Low Phase Noise
  • Low Microphonics
  • Low Current
  • Custom Design

 General Specifications (also see options)
 Output Frequency 400 MHz to 14 GHz
 Reference Frequency
10 MHz for Output Frequency 0.4-3.4 GHz (see notes)
25-200 MHz for Output Frequency 3.4-14.0 GHz (see notes)
 Frequency Stability Reference dependent
 Output Power +13dBm min. (see options)
 Output Power Stability +/-2dB max
 Harmonics -20dBc max.
 Ref. Related Spurious -70dBc max.
 Divided Ref. Related Spurious -50dBc (400 MHz - 3.4 GHz)
 Other Spurious -80dBc max.
 Load VSWR 2.5:1 max.
 Input Voltage +11 to 16V d.c. (see options)
 Input Current 300mA max. (for +13dBm)
Operating Temperature 0+50C standard (see options)
 Storage Temperature -40+85C
 Lock Alarm TTL high for locked
 RF Output Connector SMA female
 Ref. Monitor Connector SMA female

The APL - 03 series of fundamental frequency phase locked oscillators utilise coaxial resonators (CRO) to 3.4 GHz and dielectric resonators (DRO) to 14 GHz in a phase locked loop for use with an external reference. Circuit design uses SMT devices including Si bipolar active devices up to 3.4 GHz and GaAs FET active devices above 3.4 GHz. The output contains a buffer amplifier for improved ruggedness, higher output power and a wider range of load VSWR. DRO types have an external tuning screw for factory set up only.

Frequencies above 14 GHz are available - please contact us for more information.

Phase Noise (dBc/Hz) (typical)
Offset Frequency (Hz) Output Frequency (GHz)
0.6 1.5 3.0 4.0 10.0 14.0
100 Reference Dependent - See Notes
1K Reference Dependent - See Notes
10K Reference Dependent - See Notes
100K -135 -125 -115 -115 -110 -105
1M -140 -140 -135 -135 -120 -115

Reference Frequency Notes:
The output frequency must be an integral multiple of the reference frequency.
Reference level required 0+/-3dBm.
At offset frequencies up to 100Hz, the output phase noise is degraded from that of the reference oscillator by approximately 20logN+3dB, where N is the ratio of the output to the reference frequency.

00 - Standard
Operating Temperature
01 - -10+60C
02 - -20+70C
03 - -40+85C
Output Power
11 - +15dBm min. up to 10 GHz
12 - +15dBm min. up to 6 GHz
D.C. Supply
21 - Input Voltage +12V d.c.
22- Regulated +11 to +16V d.c.
23 - +28V d.c.

Custom Options:

  • Higher Output Frequency to 30GHz (multiplied)
  • Higher Output Power to +30dBm (amplified)
  • Lower Harmonics (filtered)
  • Lock Alarm - Open Collector
  • Custom Sizes
  • Instrument or Rack Mount Housing with Power Supply

Model Numbers:
APL-03-13.050-50-00 13.05GHz PLO with standard specifications and 50MHz ref.
APL-03-9.750-50-02-11-23 9.75GHz PLO with 50MHz ref., -20+70C, +15dBm and +28V

All dimensions are inches (mm)

We reserve the right to change standard product specifications without notice but will be pleased to consider control drawings for quotation.

T: +44 (0)1376 550220 F: +44 (0)1376 552145 E: 40A Springwood Drive, Braintree, Essex CM7 2YN, England