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Sub- THz generators and detectorsTerasense IMPATT

IMPATT sub-THz generators

  • 80 — 120 GHz  frequency range
  • Typical output power 10 mW
  • Low cost and compact
  • 1 year warranty
  • Customer focused solutions
  • Add-ons with enhancements

An IMPATT diode (IMPact ionization Avalanche Transit-Time) is a high-power diode used in microwave electronics and sub-THz devices. They operate at frequency range 3 — 400 GHz. Main advantage is their high-power capability and small size. The IMPATT diode operates over a narrow frequency band, and diode internal dimensions must correlate with the desired operating frequency.

TeraSense series of IMPATT diodes are silicon double drift diodes with a 0.6 um transit region, mounted on copper heat sink. The layers in double-drift diodes are: a heavily doped (p+)-region, a moderately doped pregion, a moderately doped n-region, and a heavily doped (n+)-region. The (p+)- and (n+)- regions allow ohmic electrical contacts to be made to the external circuit. The device relies on negative resistance to generate and sustain an oscillation.

IMPATT Diode Specifications

  • 80 — 120 GHz frequency range.
  • Available minimum output power 10 mW.
  • Typical linewidth can be narrowed down to 1 MHz.
  • Operating voltage range 15-16 V.
  • Operating current 110 — 120 mA.
  • Input power 2W (stable current source required, TeraSense-produced source is highly recommended)
  • TTL Modulation option (1us rise/fall time) — available as add-on option
  • Rigidly attached conical horn — available as add-on option
  • High power option (>50 mW output rfpower) — available as add-on option
  • Sensitive area: 2 x 2, mm
  • No power supply needed
  • 1 year warranty period.

Terasense Ultrafast sub terahertz detector

Ultrafast sub-Terahertz detectors

  • Response time: 150 ps
  • Spectral Range: 10 GHz — 1.2 THz
  • Responsivity (typical): 1 V/W
  • Noise Equivalent Power : 500 pW/√Hz
  • Compact size: 23 x 29 x 6.5, mm

Passive-type ultra-fast detector for sub-THz radiation range. This product is an ultimately user-friendly plug & play device. All you need to put it to use is an oscilloscope (or any other type of voltage detector), which is to be plugged to a coaxial SMA type output connector and then exposed to a THz or sub-THZ radiation under investigation.


TeraSense® detector response time was measured using mixing method at local oscillator frequency of 97 GHz. Photo response of the detector measured as a function of differential frequency Δf is shown in Figure to the left. Photo response cut-off differential frequency f0 = 3.75 GHz, which corresponds to response time of 300 ps. 


TeraSense® detectors are sensitive in a wide frequency range. However, due to radiation interference within the bulk of detector’s crystal, its responsivity consists of multiple peak structures (see example in Figure to the right). Most importantly, our specialists — having full control of the technology- can tune up positions of the peaks in responsivity curve at manufacturing stage. This way, being offered such  attractive and free customization opportunity, our clients can choose and order specific frequencies or frequency ranges they need, when making their purchase request.

Our ultrafast high-sensitive sub-THz detectors are meant for exploring fast-changing and transient sub-THz signals and impulses. Terasense detectors are actually expediting the advent of ultra-high-speed wireless telecommunication networks  that is about to happen in the nearest future. Terasense ultrafast detectors are also an ultimate tool for characterization, calibration and tuning of impulse sub-THz sources.

For more information on these products call 01635 30345 or email