High Power Voltage Controlled Oscillators

  • High output power
  • Digital/Electrical Frequency control
  • High power and frequency stability
  • Digital/Electrical control of output power
  • Ability of long-term frequency stability
  • Stable spectrum
  • Ability of remote control/diagnostics via internet
  • Long life time
  • EPR spectrometer bridge
  • DNP polarizer source
  • Measurement and test equipment
  • Mm-wave source of high power
  • Plasma diagnostics
  Millimeter-wave oscillators of VCOM-XX series originally was designed for purposes of EPR spectroscopy and plasma diagnostics. It provides electromagnetic energy within some range around of central frequency with high output power. Original design uses low frequency stable voltage controlled oscillator and frequency multiplier. To increase output power an IMPATT mm-wave power amplifier can be used. Max value of output power level depends on requested frequency range. It can be 200 mW at
94 GHz, 50 mW at 140 GHz and 10 mW at 170 GHz.
   Output power and frequency are controlled by means digital code signal (symbol D at end of p/n: VCOM-…-DD, VCOM-…-DA, VCOM-…-DP models) or with external DC or pulse voltages (VCOM-…-T, VCOM-…-DA, VCOM-…-DP models). Digital control models of VCOM-XX have built in frequency counter what allows providing high long-term stability of output frequency. Also remote control and diagnostics of operation through internet is admissible.
   Reliable work of VCOM-XX oscillators allows using them in scientific experiments which last for long time, a few weeks or even months.
There are set of standard models of the VCOM-XX oscillators now.
T   – analogue control of frequency and power level

DD – digital control of frequency and power level

DA – analogue and digital control (switchable modes)

DP – digital control of output frequency, digital and analogue control of power level (up to 5kHz pulse modulation of power level available).

Custom designed VCOM models can be produced by special order. 


MODEL VCOM-10/94/0.5/200-XX VCOM-06/140/2/20-XX VCOM-06/170/2/10-XX
Central frequency 94 GHz 140 GHz 170 GHz
Bandwidth 500 MHz 2 GHz 2 GHz
Frequency Range (controlled) 93.75-94.25 GHz 139-141 GHz 169-171 GHz
Output power (controlled) 0-200 mW 0-20 mW 0-10 mW
Spectrum line width at -3dBc 100 kHz max 100 kHz max 100 kHz max
Control attenuation 0…50 dB 0…50 dB 0…40 dB
Flange/ Waveguide UG-387/U-M /WR-10 UG-387/U-M /WR-06 UG-387/U-M /WR-06
Operating Humidity in Temp range of +10 to +40 °С < 70% (non-condensing) < 70% (non-condensing) < 70% (non-condensing)
For models with digital control:
Frequency Step (max) 250 kHz 350 kHz 500 kHz
Power Level Step < 1 mW < 0.1 mW 0.05 mW
Absolute accuracy of set Frequency in range of +10 to +40 °С <0.5 MHz <0.7 MHz <1 MHz
Settling time to major frequency step within 0.5 MHz less than or equal to 500 ms (max) less than or equal to 500 ms (max) less than or equal to 500 ms (max)
Long term stability of reference crystal oscillator at constant temperature +/- 1 ppm per month +/- 1 ppm per month +/- 1 ppm per month
Output Frequency/Power Control connector RS232/DB-9 Plug RS232/DB-9 Plug RS232/DB-9 Plug
Remote Diagnostic Protocol Ethernet/SNMP v1 Ethernet/SNMP v1 Ethernet/SNMP v1
Ethernet port: RG-45 Socket RG-45 Socket RG-45 Socket

Basic block-schemes of VCOM oscillator:
A. Wideband VCOM…-T (does not have powerful output power amplifier which limits operating bandwidth):
B. High power VCOM…-DD with digital control and remote control/diagnostics:
A) B)
Control panel of VCOM-10/94/0.5/200-DA (a) and VCOM-06/140/0.5/50-DD oscillators (b)
Typical measured data of W- and D- band VCOM-XX oscillators:

How to order

Specify Model Number VCOM-XX/CF/BW/P-AB, where

XX – number of waveguide standard (Ex. 10 for WR-10 and 06 for WR-06)

CF – central operating frequency in GHz 

BW – operating bandwidth, GHz 

P    – output power (nom.), mW

AB – type of output frequency and power control: -T or -DD, or –DA or -DP

Standard flange is UG-XXX/U-M round


VCOM-10/94/0.5/200-DD ( W-band oscillator, WR-10 waveguide, Central frequency 94 GHz, Bandwidth 0.5 GHz, Output power 200 mW (typ.), Digital control of output power and frequency).