Reconfigurable RF notch filter based on an integrated silicon optical true time delay line

Jing, Jiayu; Wang, Xinyi; Lu, Liangjun; Zhou, Linjie; Shu, Haowen; Chen, Jianping

doi:10.1088/1361-6463/ab0735

Cited by 10 publications

(3 citation statements)

References 35 publications

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“…Although rather speculative, the PM-HLL may also be used for high-frequency applications such as radio receivers. For this, it may be required to use tunable analog delay lines (e.g., [28]) for implementing the comb filters (Eq. ( 5)).…”

Section: Discussionmentioning

confidence: 99%

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The Period-Modulated Harmonic Locked Loop (PM-HLL): A low-effort algorithm for rapid time-domain multi-periodicity estimation

Hohmann

2021

Acta Acust.

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Many speech and music analysis and processing schemes rely on an estimate of the fundamental frequency f0 of periodic signal components. Most established schemes apply rather unspecific signal models such as sinusoidal models to the estimation problem, which may limit time resolution and estimation accuracy. This study proposes a novel time-domain locked-loop algorithm with low computational effort and low memory footprint for f0 estimation. The loop control signal is directly derived from the input time signal, using a harmonic signal model. Theoretically, this allows for a noise-robust and rapid f0 estimation for periodic signals of arbitrary waveform, and without the requirement of a prior frequency analysis. Several simulations with short signals employing different types of periodicity and with added wide-band noise were performed to demonstrate and evaluate the basic properties of the proposed algorithm. Depending on the Signal-to-Noise Ratio (SNR), the estimator was found to converge within 3–4 signal repetitions, even at SNR close to or below 0 dB. Furthermore, it was found to follow fundamental frequency sweeps with a delay of less than one period and to track all tones of a three-tone musical chord signal simultaneously. Quasi-periodic sounds with shifted harmonics as well as signals with stochastic periodicity were robustly tracked. Mean and standard deviation of the estimation error, i.e., the difference between true and estimated f0, were at or below 1 Hz in most cases. The results suggest that the proposed algorithm may be applicable to low-delay speech and music analysis and processing.

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Section: Discussionmentioning

confidence: 99%

“…For this, it may be required to use tunable analog delay lines (e.g. [26]) for implementing the comb filters (eqn. 5).…”

Section: Discussionmentioning

confidence: 99%

The Period-Modulated Harmonic Locked Loop (PM-HLL): A low-effort algorithm for rapid time-domain multi-periodicity estimation

Hohmann

2021

Acta Acust.

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“…At present, most front door protection is concentrated at the circuit level. Out-of-band HPM and EMP energy can be attenuated by band-pass filters [6], [7], while the protection of sensitive components against in-band high power threats is usually dependent on power limiters [8]- [10]. In order to…”

Section: Introductionmentioning

confidence: 99%

Waveguide Energy-Selection-Filter Switch Array

Lin

Liu

et al. 2019

IEEE Access

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This paper presents a waveguide energy-selection-filter switch (ESFS) array for high-power microwave protection, which has a nonlinear transmission response depending on the power intensity of the incident wave. A prototype of nine unit-cells loaded with pin diodes is designed and measured. First, the relationship between the unit-cell dimension and frequency response is analyzed by the full-wave simulation, and an equivalent circuit is studied with numerical fitting. Then, the non-linear characteristics of the unit-cell for different power levels are observed by using an electric field probe. Subsequently, the array structure is designed with equivalent circuits made to evaluate the performance and the coupling effects between the array elements. At the same time, the influence of the number of elements on the transmission coefficient is discussed. Finally, the nonlinear and adaptive transmission characteristics of the ESFS array are demonstrated by the waveguide measurements, which show an isolation improvement of 19.5 dB for high-power microwave protection compared to a single ESFS unit. In addition, the protecting band is wider than that of a single unit. INDEX TERMS Adaptive protection, energy-selection-filter, high power microwave, pin diode loaded, waveguide.

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LNOI waveguide grating based true time delay line for tunable bandpass microwave photonic filter

Gong

et al. 2020

Opt Quant Electron

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Reconfigurable RF notch filter based on an integrated silicon optical true time delay line

Cited by 10 publications

References 35 publications

The Period-Modulated Harmonic Locked Loop (PM-HLL): A low-effort algorithm for rapid time-domain multi-periodicity estimation

The Period-Modulated Harmonic Locked Loop (PM-HLL): A low-effort algorithm for rapid time-domain multi-periodicity estimation

Waveguide Energy-Selection-Filter Switch Array

LNOI waveguide grating based true time delay line for tunable bandpass microwave photonic filter

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