Bandpass phase shifter and analytic signal generator

Peddinti, Vijay Kumar; Kumaresan, R.

doi:10.1016/j.sigpro.2016.01.015

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…The Hilbert transform is a fundamental signal processing function with wide range of applications in radar systems, signal sideband modulators, measurement systems, signal sampling, and many others [1][2][3][4][5][6][7][8]. Fractional Hilbert transforms provide an additional degree of freedom in terms of a variable phase shift, which can meet the special requirements of unilateral communication [2] and confidentiality of hardware keys [3].…”

Section: Introductionmentioning

confidence: 99%

“…Fractional Hilbert transforms provide an additional degree of freedom in terms of a variable phase shift, which can meet the special requirements of unilateral communication [2] and confidentiality of hardware keys [3]. In practical applications such as multiplexing and demultiplexing signals, analyzing individual sub-channel spectral components, etc., Hilbert transformers are typically realized as a truncated or windowed version of the ideal Hilbert transform impulse response [5][6][7]. Therefore, Hilbert transformers covering a wide range of different band pass regions are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

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Versatile, highly reconfigurable, high bandwidth, radio frequency and microwave photonic Hilbert transformers with soliton crystal Kerr micro-comb sources

Moss

2022

Preprint

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We experimentally demonstrate bandwidth-tunable RF photonic Hilbert transformer based on an integrated Kerr micro-comb source. The micro-comb is generated by an integrated micro-ring resonator with a free spectral range of 48.9 GHz, yielding 75 micro-comb lines in the telecom C-band. By programming and shaping the generated comb lines according to calculated tap weights, we demonstrate high-speed Hilbert transform functions with tunable bandwidths ranging from 1.2 GHz to 15.3 GHz, switchable center frequencies from baseband to 9.5 GHz, and arbitrary fractional orders. The experimental results show good agreement with theory and confirm the effectiveness of our approach.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Versatile, highly reconfigurable, high bandwidth, radio frequency and microwave photonic Hilbert transformers with soliton crystal Kerr micro-comb sources

Moss

2022

Preprint

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“…Fractional Hilbert transforms can meet specific requirements for secure single sideband communications [2] as well as hardware keys [3] since they provide an additional degree of freedom in terms of a variable phase shift. In practical applications such as multiplexing and demultiplexing signals, analyzing individual sub-channel spectral components, etc., Hilbert transformers are typically realized as a truncated or windowed version of the ideal Hilbert transform impulse response [4][5][6]. Thus, Hilbert transformers that cover a wide range of different bandpass regions are in high demand.…”

Section: Introductionmentioning

confidence: 99%

Tunable Broadband RF Photonic Fractional Hilbert Transformer Based on a Soliton Crystal Microcomb

Tan¹,

Xu²,

Moss³

2021

Preprint

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We demonstrate an RF photonic fractional Hilbert transformer based on an integrated Kerr micro-comb source featuring a record low free spectral range of 49 GHz. By programming and shaping the comb lines according to calculated tap weights for up to 39 wavelengths across the C-band, we achieve tunable bandwidths ranging from 1.2 to 15.3 GHz as well as variable center frequencies from baseband to 9.5 GHz, for both standard integral and arbitrary fractional orders. We experimentally characterize the RF amplitude and phase response of the tunable bandpass and lowpass Hilbert transformers with 90 and 45-degree phase shifts. The experimental results show good agreement with theory, confirming the effectiveness of our approach as a powerful way to implement standard and fractional order Hilbert transformers with broad and variable bandwidths and center frequencies, with high reconfigurability and greatly reduced size and complexity. Tan, and D. J. Moss are with the Optical Sciences Centre, Swinburne University of Technology, Hawthorn, VIC 3122, Australia. (Corresponding e-mail: dmoss@swin.edu.au). Xu is with the Electro-Photonics Laboratory, Department of Electrical and Computer System Engineering, Monash University, Clayton, 3800 VIC, Australia

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“…In many applications, such as signal analysis and signal detection, an quadrature signal is needed, and the input signal generates quadrature signals by 90 degrees phase shifting [1][2][3]. If the input signal frequency is fixed, the phase shift 90 degrees can be achieved by adjusting the parameters of the RC circuit [4][5].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Self-tracking 90 Degrees Phase Shift Circuit

Ma¹,

Fan²,

Zhang³

2018

dtcse

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Based on the linear phase shift of Bessel filter and the frequency doubling function of phase-locked loop, the new structure of 90 degrees phase shift circuit is proposed. The input signal is amplified and shaped into digital signal, and the clock of switched capacitor filter MAX296 is generated by the phase-locked loop. It can control the ratio between clock and input signal frequency of the filter. So when sinusoidal signal is as input of the filter, in a wide frequency range of from 20Hz to 1kHz, the 90 degrees phase shift can be achieved at the output of the filter. The working principle of the system is described, and the design circuit and experimental results are given. 1

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Bandpass phase shifter and analytic signal generator

Cited by 8 publications

References 6 publications

Versatile, highly reconfigurable, high bandwidth, radio frequency and microwave photonic Hilbert transformers with soliton crystal Kerr micro-comb sources

Versatile, highly reconfigurable, high bandwidth, radio frequency and microwave photonic Hilbert transformers with soliton crystal Kerr micro-comb sources

Tunable Broadband RF Photonic Fractional Hilbert Transformer Based on a Soliton Crystal Microcomb

Design and Implementation of Self-tracking 90 Degrees Phase Shift Circuit

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