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2020•Unpublished venueRequires access

A second-order noise-shaped triple-slope integrating analogue to digital converter

Masoomeh Momeni, Shahbaz Zahr Reyhani

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Abstract

In this paper, a second-order oversampling analogue to digital converter (ADC) is presented, in which a noise-shaped triple-slope integrating quantizer is used. The proposed integrating ADC uses three different slopes which reduce the number of clock pulses to predict the input signal and can be used in wideband applications. The quantization noise shaping is achieved with some simple modifications in the architecture of ADC. The simulation results indicated that the performance of the proposed ADC can be enhanced by increasing the order of integration due to the noise shaping property in the designed quantizer. The proposed second-order ADC has achieved a signal to noise and distortion ratio of (SNDR) 75.8 dB at oversampling ratio (OSR) of 8 for input bandwidth of 20 KHz.

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What this paper is about

In this paper, a second-order oversampling analogue to digital converter (ADC) is presented, in which a noise-shaped triple-slope integrating quantizer is used. The proposed integrating ADC uses three different slopes which reduce the number of clock pulses to predict the input signal and can be used in wideband applications. The quantization noise shaping is achieved with some simple modifications in the architecture of ADC. The simulation results indicated that the performance of the proposed ADC can be enhanced by increasing the order of integration due to the noise shaping property in the designed quantizer. The proposed second-order ADC has achieved a signal to noise and distortion ratio of (SNDR) 75.8 dB at oversampling ratio (OSR) of 8 for input bandwidth of 20 KHz.

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Available abstract

In this paper, a second-order oversampling analogue to digital converter (ADC) is presented, in which a noise-shaped triple-slope integrating quantizer is used. The proposed integrating ADC uses three different slopes which reduce the number of clock pulses to predict the input signal and can be used in wideband applications. The quantization noise shaping is achieved with some simple modifications in the architecture of ADC. The simulation results indicated that the performance of the proposed ADC can be enhanced by increasing the order of integration due to the noise shaping property in the designed quantizer. The proposed second-order ADC has achieved a signal to noise and distortion ratio of (SNDR) 75.8 dB at oversampling ratio (OSR) of 8 for input bandwidth of 20 KHz.

Key concepts: Oversampling, Noise shaping, Quantization (signal processing), Delta-sigma modulation, Wideband, Electronic engineering, Effective number of bits, Successive approximation ADC

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