Aim of This work is to Design a second order discrete time sigma delta modulator for low frequency high resolution applications, which can be used in data converters (sigma delta ADC) where high resolution is required for more accuracy in signal processing’s. A real world is analogue but easier to process digital data ex: speech, image processing’s. Analog signal contains too much unnecessary d...

A low-voltage low-power discrete time sigma delta modulator for biomedical signal acquisition designed and implemented in 0.18-μm CMOS process is presented in this paper. This sigma delta modulator is designed using cascaded 3rd-order feedback form of integrator with the over sampling ratio (OSR) of 32. The experimental prototype chip achieves 55dB and 60dB dynamic range for 200Hz and 500Hz sig...

In this paper, a new approach for design of a fully differential second order current mode continuous-time sigma-delta modulator is presented. For circuit implementation, square root domain (SRD) translinear loop based on floating-gate MOS transistors that operate in saturation region is employed. The modulator features, low supply voltage, low power consumption (8mW) and high dynamic range (55...

Design techniques for sigma-delta modulators from communications are applied and adapted to improve the spectral characteristics of high frequency power electronic applications. A high frequency power electronic circuit can be regarded as a quantizer in an interpolative Σ∆ modulator. We review one dimensional sigma-delta modulators and then generalize to the hexagonal sigma-delta modulators tha...

Sigma-delta ADC, not only has adopted the technology of oversampling, but also utilized noise shaping which modulate the quantization noise in the baseband to the high frequency area. It increases the SNR in baseband and the effective quantization number of the converter. Because of the modulation technology, it makes sigma-delta ADC allowed to use one bit comparator, in addition Conventional N...

This paper presents a circuit including a high-pass Σ∆ modulator implemented in CMOS process and a timeinterleaved high-pass Σ∆ analog to digital converter.

One of the greatest unsolved problems in the theory of sigma delta modulation concerns the ability to analytically derive the stability, or boundedness, of a high order sigma delta modulator (SDM). In this work, we describe the existing literature and try to clarify the issues involved. We fully derive the stability of first order sigma delta modulators, and derive some important results for th...

Sigma-Delta (∑-∆) analog to digital converters are well known for its use in high accuracy wireless communication applications. It is alternative for low power, high resolution (greater than 12 bits) converters, which can be ultimately integrated on digital signal Processor ICs. In this work Over Sampling concept is used to address the problem of power dissipation and noise in ADCs. In this pap...

This work presents a novel noise-shaping cascaded sigma-delta modulator that incorporates two stages. The first stage is realized by low-order single bit architecture, while the second stage is realized by a high-order feed-forward multi-bit architecture. Moreover, the error cancellation schemes can be added in the digital circuit part to cancel the coarse quantization errors and thus effective...

In communication systems the present trend is to move the border between the analog and digital interface as close as possible to the point where information is received or emitted, in this way most of SoC functionalities are implemented in the digital domain. in this work an efficient first order sigma delta modulator has been designed in circuit level, considering the possible non-idealities ...