1.98 THz resonant-tunneling-diode oscillator with reduced conduction loss by thick antenna electrode

Izumi, Ryunosuke; Suzuki, Safumi; Asada, Masahiro

doi:10.1109/irmmw-thz.2017.8066877

Cited by 128 publications

(109 citation statements)

References 3 publications

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“…[4][5][6][7] Operating frequency of oscillators with electron devices has also been rapidly increasing from the millimeter wave side. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] Among the electron devices, resonant tunneling diodes (RTDs) have been considered as one of the candidates for compact THz oscillators at room temperature. [16][17][18][19][20][21][22][23] Oscillations up to 1.98 THz 23 and relatively high output power in the sub-THz region 24 have been reported for these oscillators.…”

Section: Introductionmentioning

confidence: 99%

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

2017

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The temperature dependences of output power, oscillation frequency, and current-voltage curve are measured for resonant-tunneling-diode terahertz (THz) oscillators. The output power largely changes with temperature owing to the change in Ohmic loss. In contrast to the output power, the oscillation frequency and current-voltage curve are almost insensitive to temperature. The measured temperature dependence of output power is compared with the theoretical calculation including the negative differential conductance (NDC) as a fitting parameter assumed to be independent of temperature. Very good agreement was obtained between the measurement and calculation, and the NDC in the THz frequency region is estimated. The results show that the absolute values of NDC in the THz region significantly decrease relative to that at DC, and increases with increasing frequency in the measured frequency range.

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Section: Introductionmentioning

confidence: 99%

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

2017

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“…The extracted device capacitance from S-parameters, which corresponds to Cn, indicates that the static capacitance C0 is slightly higher (90 fF). Thus, Cqw can be determined from the total capacitance variation using (6).…”

Section: B Device Capacitancementioning

confidence: 99%

“…There is intense on-going research on this device technology to realise compact and coherent THz sources [2]- [5]. Fundamental frequency oscillations at around 2 THz have recently been obtained from RTD oscillators [6]. Compared to other electronic device technologies that may be used in the 0.1 -1 THz band such as transistors, Gunn diodes, etc., the RTD exhibits the largest bandwidth (for a given device size), requires simple circuitry, is compact, and consumes low power [7].…”

Section: Introductionmentioning

confidence: 99%

Accurate Small-Signal Equivalent Circuit Modeling of Resonant Tunneling Diodes to 110 GHz

Morariu

Wang

Cornescu

et al. 2019

IEEE Trans. Microwave Theory Techn.

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This paper presents a novel, on-wafer de-embedding technique for the accurate small-signal equivalent circuit modelling of resonant tunneling diodes (RTDs). The approach is applicable to stabilised RTDs, and so enables the modelling of the negative differential resistance (NDR) region of the device's current-voltage (I-V) characteristics. Further, a novel quasianalytical procedure to determine all the equivalent circuit elements from the de-embedded S-parameter data is developed. Extraction results for a 10 x 10 µm 2 stabilised, low-current density RTD at different bias points show excellent fits between modelled and measured S-parameters up to 110 GHz.Index Terms-Bias oscillations, experimental modelling, parameter extraction, Resonant tunneling diode (RTD), smallsignal equivalent circuit. Lisbon. His current research interests include applications of resonant tunneling diodes and resonant tunneling diode based optoelectronic devices, and neural-inspired photonic circuits.

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“…Asada, et al [11] showed in their earlier work, the oscillation frequency increased to 345 GHz with a slot width of 2 mm from a 330 GHz with a slot width of 4 mm. For [3], the oscillation frequency of the RTD Oscillator is already close to 2 THz. At such high frequencies, transmission line theory is more suitable for analyzing RTD Oscillator than the conventional lumped-element equivalent circuit model.…”

mentioning

confidence: 95%

“…RTD requires two electrodes and oscillator requires an antenna. Refer to [2,3,10] and [26], it is common to apply a DC bias voltage to the antenna. In this study, the positive electrode of the DC power supply is modified and designed as an antenna.…”

mentioning

confidence: 99%

Resonant Tunneling Diode (RTD) Terahertz Active Transmission Line Oscillator with Graphene-Plasma Wave and Two Graphene Antennas

et al. 2019

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This study describes the design of a resonant tunneling diode (RTD) oscillator (RTD oscillator) with a RTD-gated-graphene-2DEF (two dimensional electron fluid) and demonstrates the functioning of this RTD oscillator through a transmission line simulation model. Impedance of the RTD oscillator changes periodically when physical dimension of the device is of considerable fraction of the electrical wavelength. As long as impedance matching is achieved, the oscillation frequency is not limited by the size of the device. An RTD oscillator with a graphene film and negative differential resistance (NDR) will produce power amplification. The positive electrode of the DC power supply is modified and designed as an antenna. So, the reflected power can also be radiated to increase RTD oscillator output power. The output analysis shows that through the optimization of the antenna structure, it is possible to increase the RTD oscillator output to 22 mW at 1.9 THz and 20 mW at 6.1 THz respectively. Furthermore, the RTD oscillator has the potential to oscillate at 50 THz with a matching antenna.

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1.98 THz resonant-tunneling-diode oscillator with reduced conduction loss by thick antenna electrode

Cited by 128 publications

References 3 publications

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

Measurements of temperature characteristics and estimation of terahertz negative differential conductance in resonant-tunneling-diode oscillators

Accurate Small-Signal Equivalent Circuit Modeling of Resonant Tunneling Diodes to 110 GHz

Resonant Tunneling Diode (RTD) Terahertz Active Transmission Line Oscillator with Graphene-Plasma Wave and Two Graphene Antennas

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