High-performance time-based continuous-time sigma-delta modulators using single-opamp resonator and noise-shaped quantizer

Tamaddon, Mohsen; Yavari, Mohammad

doi:10.1016/j.mejo.2016.08.008

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Although the concept of the NSQ was first introduced by Tamaddon and Yavari, its performance and the detailed analysis are further elaborated in this paper. In Tamaddon and Yavari, the reported CTSDM incorporates the NSQ to enhance its performance; however, the performance of the NSQ itself is not fully investigated. Hence, a detailed insight of the NSQ seems to be necessary to generalize the concept.…”

Section: Introductionmentioning

confidence: 99%

An oscillatory noise‐shaped quantizer for time‐based continuous‐time sigma‐delta modulators

Tamaddon

Yavari

2017

Circuit Theory & Apps

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Summary In this paper, a new type of an oscillatory noise‐shaped quantizer (NSQ) for time‐based continuous‐time sigma‐delta modulators is presented. The proposed NSQ is composed of an oscillatory voltage‐to‐time converter and a polyphase sampler. Using Tustin's transformation method and through the approximation of the comparator gain, a linearized model of the NSQ is introduced. This way, a novel realization of the first‐ and second‐order NSQ is presented. Its implementation is based on fully passive continuous‐time filters without needing any amplifier or power consuming element. The ploy‐phase sampler inside the NSQ is based on the combination of a time‐to‐digital and a digital‐to‐time converter. The layout of the proposed NSQ is provided in Taiwan Semiconductor Manufacturing Company 0.18 μm complementary metal‐oxide‐semiconductor 1P6M technology. The verification of the proposed NSQ is done via investigating both the system level and postlayout simulation results. Leveraging the proposed NSQ in an Lth‐order time‐based continuous‐time sigma‐delta modulator enhances the noise‐shaping order up to L + 2, confirming its superior effectiveness. This makes it possible to design high performance and wideband continuous‐time SDMs with low power consumption and relaxed design complexity.

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Section: Introductionmentioning

confidence: 99%

An oscillatory noise‐shaped quantizer for time‐based continuous‐time sigma‐delta modulators

Tamaddon

Yavari

2017

Circuit Theory & Apps

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An asynchronous pulse width modulator for DC‐DC buck converter

Inanlou

Shoaei

Tamaddon

2019

Circuit Theory & Apps

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Summary This paper presents an asynchronous pulse width modulation (APWM) approach for the analysis of a new class of the switched mode power supply (SMPS). The proposed APWM significantly simplified the mathematical analysis by utilizing a binary comparator (BAPWM) and a distinctive delay cell instead of hysteretic comparator. By this way, the mathematical analysis can be extended to study the behavior of high‐order self‐oscillating modulators in terms of key parameters such as the harmonic distortion and the stability. The performance of the proposed BAPWM is deeply analyzed for different orders of loop filters (here up to third order) in both time and frequency domain. To verify the effectiveness of the proposed analytical derivations, the BAPWMs are employed in a classic synchronous DC‐DC buck converter and its closed loop performance, in terms of stability, has been investigated. Then the converter is designed and simulated in 130‐nm CMOS technology to convert input voltage of 5 to 3.3 V with maximum load current of 1 A, using Spectre simulator. From the post‐layout simulation results, the peak efficiency conversion efficiency for 3.3 V output voltage is higher than 89%.

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