Multiphase Oscillator Using Traveling Pulses Developed in a System of Transmission Lines with Regularly Spaced Resonant-tunneling Diodes

Narahara, Koichi

doi:10.1007/s10762-017-0371-4

Cited by 6 publications

(7 citation statements)

References 17 publications

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“…In the framework of the transmission line theory, the reduced physical dimensions of the RTD line system are shown to increase the oscillation frequency . However, the transmission line theory may become invalid when the frequency becomes large.…”

Section: Discussionmentioning

confidence: 99%

“…In the framework of the transmission line theory, the reduced physical dimensions of the RTD line system are shown to increase the oscillation frequency. 7 However, the transmission line theory may become invalid when the frequency becomes large. To examine the properties of high-frequency systems, we perform FDTD calculations for the system struc- Figure 6 with reduced spatial dimensions.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, we proposed a scheme to generate multiphase oscillatory signals using a system of transmission lines with regularly spaced resonant‐tunneling diodes (RTDs), which consists of several straight lines coupled in a closed line. () Generically, strongly coupled oscillator systems exhibit traveling‐pulse behavior by coherently delayed oscillations. () The development of traveling pulses guarantee that the phase of each contributing oscillator sequentially increases as it propagates.…”

Section: Introductionmentioning

confidence: 99%

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Full‐wave analysis of traveling pulses developed in a system of transmission lines with regularly spaced resonant‐tunneling diodes

Narahara

Maezawa

2017

Circuit Theory & Apps

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Summary In a system of transmission lines with regularly spaced resonant‐tunneling diodes (RTDs), where several straight RTD lines are connected halfway to a closed RTD line, a pulse‐shaped rotary traveling wave develops on the closed line by mutual synchronization of the oscillatory edge developed in each straight RTD line. The oscillating edge on each straight line is synchronized with the traveling pulse, such that the system has the potential to generate multiphase oscillatory signals in millimeter‐wave frequencies. To examine the dynamics of traveling pulses at such high frequencies, the system is modeled in the framework of the finite‐difference time‐domain method. It is found that a traveling pulse develops in the closed RTD line synchronized with the oscillatory edges moving in the straight lines, assuming a microstrip structure for each RTD line. We then compare the results of the finite‐difference time‐domain calculation with those predicted by the transmission line theory with parameter values obtained by the quasi‐transverse electromagnetic estimation. In addition, the RTD line that compactly confines the electromagnetic fields is shown to have the potential to generate multiphase oscillatory signals at submillimeter‐wave frequencies.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Full‐wave analysis of traveling pulses developed in a system of transmission lines with regularly spaced resonant‐tunneling diodes

Narahara

Maezawa

2017

Circuit Theory & Apps

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“…Part of the oscillating edges on

{normalTL}_{i}

then moves into TR to organise a rotary travelling pulse. As a result, the phase of the oscillating edge on each TL delays or advances by a constant value from that on its neighbour, so that the outputs from another end of TL can result in multiphase oscillation [1]. The current and voltage relating each cell on

{normalTL}_{i}

are represented by

N_{L} + 1

and

N_{L}

variables, respectively, whereas

3 \times false(2 N_{C} + 1 false)

variables are required for representing the currents and voltages on TR; therefore, the system dimension D turns out to be

6 N_{L} + 6 N_{C} + 6

.…”

Section: Injection‐locking Properties Of Td‐line Systemmentioning

confidence: 99%

Injection‐locked rotary travelling pulse in closed tunnel‐diode line for multiphase oscillation

2019

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Injection-locking properties of a rotary travelling pulse developed in a system of tunnel-diode (TD) transmission lines are characterised for multiphase oscillation. The system includes a unique TD line loop coupled with evenly spaced straight TD lines. The oscillating voltage edges in straight lines are synchronised to organise the rotary pulse on the closed one. Based on the phase-reduction theory, the authors determine where to connect an external oscillator for sufficient locking frequency range. Inherently, the travelling pulse can rotate on the loop in either clockwise or anticlockwise fashion. The rotation frequency slightly depends on the rotation direction by the finite fluctuation of device parameter values. By matching the frequency of the external oscillator with one of such frequencies, the rotation direction is specified as required. These injection-locking properties are validated experimentally.

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“…7 The oscillator based on transmission line loaded RTD is one of the most potential candidate devices for terahertz oscillators. [8][9][10] However, the fabrication of high oscillation RTD Oscillator is still a difficult challenge. [11][12][13] Ryzhii et al proposed that THz emission could be possible in high electron mobility transistors (HEMTs) with gates exhibiting NDC.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of terahertz active transmission line oscillator based on RTD-gated HEMT

et al. 2018

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In this paper, a new kind of terahertz oscillator is presented using plasma wave excitation in a resonant tunnel diode (RTD) gated high electron mobility transistor (HEMT). The plasma wave arising from the RTD-gated HEMT is equivalent to active transmission lines and induces negative differential conductance (NDC) of the oscillator. The proposed RTD-gated HEMT oscillator is more compact and has higher oscillation frequency than the transmission line loaded traditional RTD oscillator duo to plasma wave effect. This paper analyses and calculates the oscillation conditions, the relationships between device structures, oscillation frequency and the output power of the oscillator. The presented work may provide a new concept for fabricating terahertz oscillator.

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Multiphase Oscillator Using Traveling Pulses Developed in a System of Transmission Lines with Regularly Spaced Resonant-tunneling Diodes

Cited by 6 publications

References 17 publications

Full‐wave analysis of traveling pulses developed in a system of transmission lines with regularly spaced resonant‐tunneling diodes

Full‐wave analysis of traveling pulses developed in a system of transmission lines with regularly spaced resonant‐tunneling diodes

Injection‐locked rotary travelling pulse in closed tunnel‐diode line for multiphase oscillation

Theoretical study of terahertz active transmission line oscillator based on RTD-gated HEMT

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