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

2019

Electron. lett.

A scheme is proposed for reducing phase noise in a spatially extended oscillator using tunnel-diode (TD) transmission line. It is observed that a voltage edge oscillates on a TD line when supplied by an appropriate DC voltage at the end. When the TD line is bypassed by a linear transmission line, part of the oscillating edge is inputted to and moves on the linear line to interact with the oscillating edge at the another crosspoint. The proper length of the linear line makes the bypassed voltage arrive at the crosspoint at the same time as the oscillating edge. It results in significant phase-noise reduction of the oscillating edge through self-injection locking. Herein, the principle of operation is described with its experimental validation.

Section: Methodsmentioning

confidence: 89%

Phase‐noise reduction by self‐injection locking in spatially extended tunnel‐diode oscillator

2019

Electron. lett.

“…Finally, we measured the properties of the TD line connected to 18 linear lines. The linear line dimensions were set at (M, K)=(2, 3), (3, 4), (4, 5), (5,6), (6, 7), (7,8), (8,9), (9, 10), (10,9), (11,10), (12,11), (13,12), (14,15), (15,16), (16,17), (17,18), (18,19), and (19,20). When trial and error optimization was applied, a mismatch occurred between M i and K i .…”

Section: Optimization Using Perturbation Projection Vectorsmentioning

confidence: 99%

“…Through this mechanism, the spatially extended oscillator can be made to operate as a voltage-controlled oscillator (VCO). Resonant-tunneling diodes (RTDs) have been utilized in ultrafast electronics, including oscillators, [7][8][9] opt-electronic applications, [10][11][12][13] and neural networks. 14 State-of-the-art RTDs can be used in place of the TDs in the spatially extended oscillator.…”

Section: Introductionmentioning

confidence: 99%

Broadband reduction of phase noise in a spatially extended tunnel‐diode oscillator through multiple self‐injection locking

2021

Circuit Theory & Apps

Self Cite

A self-injection locking scheme is proposed to reduce phase noise in a spatially extended oscillator that uses a tunnel-diode (TD) transmission line. When a linear transmission line is connected to each cell of the TD line, a part of the oscillating edge flows through the linear line. This wave on the linear line is reflected at its far end and flows back to the point of connection of the TD and linear transmission lines. By matching the time taken by the reflected wave on the linear transmission line to reach the point of connection with the time taken by the forward-moving oscillating edge to return to the point, the edge can be synchronized with the wave that flows back through each linear line. This multiple self-injection locking significantly reduces the phase noise of the oscillating edge. In this work, the technique of phase noise reduction is explained through numerical phase noise analysis using the perturbation projection vector of the system. Several experimental observations were made to validate the reduction of the phase noise in the oscillating edge traveling on the TD line.

“…By applying this mechanism, a tunnel-diode (TD) oscillator lattice loop has been characterized for use as a multiphase oscillator. [16][17][18][19][20] A multiphase oscillator is an essential electronic component in cost-effective systems such as time-interleaved analog-to-digital converters 21,22 and parallelism. Multiple-phased clocks can relax the base clock rate subharmonically and render one of the effective platforms realizing high-frequency applications.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, pulsed wave tends to rotate in an oscillator lattice loop. By applying this mechanism, a tunnel‐diode (TD) oscillator lattice loop has been characterized for use as a multiphase oscillator 16–20 …”

Section: Introductionmentioning

confidence: 99%

Mutual synchronization of rotary pulses in coupled tunnel‐diode oscillator lattice loops

2022

Circuit Theory & Apps

Self Cite

Coupled tunnel-diode oscillator lattice loops are investigated to characterize the mutual synchronization of nonlinear rotary pulses. In a properly biased lattice loop, a pulsed phase wave autonomously rotates. When two loops are coupled, these pulses are supposed to be mutually synchronized to start rotating with a fixed phase difference. To quantify the synchronization properties of both the in-phase and out-of-phase rotary pulses, two five-cell loops that are point-coupled by a capacitor are studied using bifurcation analyses with respect to the bias voltage and coupling capacitance. In-phase pulses are allowed irrespective of the coupling capacitance, whereas relatively small coupling is favorable for out-of-phase pulses. Moreover, a solution exists whose phase difference continuously varies with the bias voltage, which bifurcates from the out-of-phase pulses through pitchfork bifurcation. This study presents the result from the bifurcation analyses. For validation of the rotary pulse in the coupled loops, we measured a breadboarded test circuit in both the frequency and time domains. The in-phase, out-of-phase, and symmetry-broken rotary pulses were detected successfully.