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Cavity-stabilized IMPATT Diode Oscillators of CIDO series

Photo of BWO tube

  • Very high frequency stability
  • High output power
  • Low phase noise
  • Fine spectrum
  • Precision frequency adjustment
  • Weak temperature dependence
  • Compact, low cost


  • Stable fixed frequency LO
  • Communication systems
  • Instruments and test equipment
  • Space and Hi-Rel systems


ELVA-1 series CIDO-XX cavity-stabilized IMPATT diode oscillators provide high frequency stability and low phase noise capabilities. They combine the extended frequency range and high output power of IMPATT oscillators with stability and phase nose capabilities provided by cavity-stabilized Gunn oscillators. These sources are available in 8 waveguide bands covering 26 to 150 GHz. The source consist of a waveguide cavity IMPATT oscillator which is coupled to a high Q, high order mode cylindrical cavity. The cylindrical cavity is made of Invar to improve the frequency stability over a broad temperature range. Operating temperature range is -50 to +50 C. Low pass EMI filter and current stabilizer included for reliable, trouble-free operation. The device supplied with an integral isolator.

Standard CIDO-XX models are supplied mounted on a finned heatsink These oscillators can maintain their operating frequency within few MegaHertz over the normal operating temperature range without a temperature controller or heater. An optional built-in temperature controlled heater can be supplied to extend the operating temperature range. The frequency can be held in a much narrower range. Custom configurations and performance characteristics different from standard models are available.


*Values are presented for the middle frequency of the frequency band.

Accuracy of frequency adjustment is about few MHz. The adjustment is provided on the factory according to customer requirements.

Typical performance

Optionally the following items would be supplied to meet customer requirements:

  1. IMPATT Injection-Locked Amplifiers IILA series to increase the output power;
  2. Phase or amplitude modulator on the base of fast P-I-N switch FPS series;
  3. Amplitude regulator on the base of Voltage Controlled Attenuator VCVA series;
  4. Power supply for AC Input Voltages 110 V, 60Hz; 220 V, 50 Hz

How to Order:

Specify Model Number CIDO-xxA-B-C-D

XX- waveguide band (WR-Number)

A - flange type : R = round or S = square (WR-28 only)

B - operating frequency in GHz

          C - output power in mW

D - AC voltage power supply options

0= no power supply 1 = 110 VAC/60Hz ,or 2 = 220 VAC/50Hz, or 3 = 100VAC/50Hz power supplies

Example:  To order oscillator meets the following specification: waveguide WR-10, round flange, operation frequency 94 GHz, output power 20mW,  input AC voltage 110ACV, should be ordered as CIDO-10R-94-20-1