Development of Supra-THz Schottky Diode Harmonic Mixers

Jayasankar, Divya; Drakinskiy, Vladimir; Sobis, Peter; Stake, Jan

doi:10.1109/irmmw-thz50926.2021.9567206

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…Two integrated circuits with Schottky contact areas of 0.11 and 0.14 µm 2 were assembled on mixer modules and characterized, showing similar performance [32]. In this section, we will present the results of the mixer with a Schottky contact area of 0.11 µm 2 .…”

Section: Resultsmentioning

confidence: 99%

A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

Jayasankar

Drakinskiy²,

Rothbart³

et al. 2021

IEEE Trans. THz Sci. Technol.

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Efficient and compact frequency converters are essential for frequency stabilization of terahertz sources. In this paper, we present a 3.5-THz, ×6-harmonic, integrated Schottky diode mixer operating at room temperature. The designed frequency converter is based on a single-ended, planar Schottky diode with a sub-micron anode contact area defined on a suspended 2-µm ultra-thin GaAs substrate. The dc-grounded anode pad was combined with the radio frequency E-plane probe, which resulted in an electrically compact circuit. At 200 MHz intermediate frequency, a mixer conversion loss of about 59 dB is measured resulting in a 40 dB signal-to-noise ratio for phase locking a 3.5-THz quantum-cascade laser. Using a quasi-static diode model combined with electromagnetic simulations, good agreement with the measured results was obtained. Harmonic frequency converters without the need of cryogenic cooling will help in the realization of highly sensitive space and air-borne heterodyne receivers.

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Section: Resultsmentioning

confidence: 99%

A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

Jayasankar

Drakinskiy²,

Rothbart³

et al. 2021

IEEE Trans. THz Sci. Technol.

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“…The mixer based on the GaAs Schottky diode is one of the most researched mixers due to its simple structure, high stability, low noise, and room temperature working conditions [6]. At present, the development of the terahertz sub-harmonic mixer is moving towards high frequency, high harmonic, and high integration [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Development of 0.34 THz Sub-Harmonic Mixer Combining Two-Stage Reduced Matching Technology with an Improved Active Circuit Model

et al. 2022

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In this paper, a high-performance 0.34 THz sub-harmonic mixer combining two-stage reduced matching technology with an improved active circuit model is established and analyzed. The mixer’s improved active circuit model is realized by decomposing passive functional models into basic transmission line units and their impedance matching and filtering are realized through automatic optimization. The improved active circuit model takes out the RF (radio frequency) transition model separately to set an optimization goal instead of operating directly in the mixing circuit. Compared with traditional active circuit models in the SDM (subdivision design method) and GDM (global design method), it provides a massive optimization space, larger working bandwidth, and better results. In the RF frequency range of 320–360 GHz, the SSB (single sideband) conversion loss of the 0.34 THz sub-harmonic mixer is below 9.5 dB and the RF return loss is less than 12 dB.

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Phase Locking of 3.5-THz and 4.7-THz Quantum-Cascade Lasers Using a Schottky Diode Harmonic Mixer

Richter

Rothbart

Wienold

et al. 2021

2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)

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High frequency accuracy and stability are important requirements for local oscillators in terahertz heterodyne spectrometers. We report on a phase-locked loop for quantumcascade lasers (QCLs) operating at 3.5 and 4.7 THz, two very important frequencies in atmospheric science and astronomy. The QCLs are locked to the multiplied output of a frequency synthesizer using a Schottky diode harmonic mixer.

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Development of Supra-THz Schottky Diode Harmonic Mixers

Cited by 5 publications

References 7 publications

A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

A 3.5-THz, ×6-Harmonic, Single-Ended Schottky Diode Mixer for Frequency Stabilization of Quantum-Cascade Lasers

Development of 0.34 THz Sub-Harmonic Mixer Combining Two-Stage Reduced Matching Technology with an Improved Active Circuit Model

Phase Locking of 3.5-THz and 4.7-THz Quantum-Cascade Lasers Using a Schottky Diode Harmonic Mixer

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