Optical delta sigma modulator system design: The best approach for THz A/D conversion

Davoudzadeh, Nima; Tafazzoli, Mohamad; Sayeh, M.R.

doi:10.1109/gsmm.2015.7175464

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…(b) Hysteresis output x 4 and input x 2 signal versus output of the integrator x 3 (a, and b adopted from Ref. ). (c) Effect of increasing the input x 1 on the transfer function.…”

Section: Calculation Of the Switching Limit For The Schmitt Triggermentioning

confidence: 99%

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Theorical and numerical analysis of an all‐optical delta‐sigma modulator

Davoudzadeh

Goddard

Sayeh

2017

Micro & Optical Tech Letters

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Delta-sigma modulation is a powerful technique for optical signal processing due to its high bandwidth, noise immunity, and low cost. In this article, a theory for all-optical delta-sigma modulation is presented along with the calculation and design parameters for optical system implementation. An optical delta-sigma modulator can be used in a microwave photonic link to encode the radio frequency signal into the duty cycle of the optical pulses. Simulation results are presented that confirm the theory and also the possibility of reaching a few GHz modulation rate in a chip-level implementation.

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“…(b) Hysteresis output x 4 and input x 2 signal versus output of the integrator x 3 (a, and b adopted from Ref. ). (c) Effect of increasing the input x 1 on the transfer function.…”

Section: Calculation Of the Switching Limit For The Schmitt Triggermentioning

confidence: 99%

“…We have previously reported the first realization of the all optical delta‐sigma modulator . The switching unit in our design controls the sampling frequency as well as its dynamic range.…”

Section: Introductionmentioning

confidence: 99%

Theorical and numerical analysis of an all‐optical delta‐sigma modulator

Davoudzadeh

Goddard

Sayeh

2017

Micro & Optical Tech Letters

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4th Order LC-Based Sigma Delta Modulators

Lima

Soares

Belfort

2022

Sensors

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Due to the characteristic of narrow band conversion around a central radio frequency, the Sigma Delta Modulator (ΣΔM) based on LC resonators is a suitable option for use in Software-Defined Radio (SDR). However, some aspects of the topologies described in the state-of-the-art, such as noise and nonlinear sources, affect the performance of ΣΔM. This paper presents the design methodology of three high-order LC-Based single-block Sigma Delta Modulators. The method is based on the equivalence between continuous time and discrete time loop gain using a Finite Impulse Response Digital-to-Analog Converter (FIRDAC) through a numerical approach to defining the coefficients. The continuous bandpass LC ΣΔM simulations are performed at a center frequency of 432 MHz and a sampling frequency of 1.72 GHz. To the proposed modulators a maximum Signal-to-Noise Ratio (SNR) of 51.39 dB, 48.48 dB, and 46.50 dB in a 4 MHz bandwidth was achieved to respectively 4th Order Gm-LC ΣΔM, 4th Order Magnetically Coupled ΣΔM and 4th Order Capacitively Coupled ΣΔM.

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Optical delta sigma modulator system design: The best approach for THz A/D conversion

Cited by 2 publications

References 8 publications

Theorical and numerical analysis of an all‐optical delta‐sigma modulator

Theorical and numerical analysis of an all‐optical delta‐sigma modulator

4th Order LC-Based Sigma Delta Modulators

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