A Low-Noise 40-GS/s Continuous-Time Bandpass $\Delta\Sigma$ ADC Centered at 2 GHz for Direct Sampling Receivers

Chalvatzis, T.; Gagnon, Edouard D.; Repeta, Morris

doi:10.1109/jssc.2007.894794

Cited by 57 publications

(16 citation statements)

References 17 publications

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“…[4][5][6][7][8][9][10], most of them using SiGe HBT technology and a single-bit quantizer. Only one of them [4] achieves SNDR and BW suitable for AAS applications, but at a sampling rate of 40 Gb/s, making decimation filtering challenging.…”

Section: B) Circuit Design: Ct Bp Dsm Versus Zero-intermediate Frequementioning

confidence: 99%

“…One difference to [4][5][6][7][8][9][10]13] is the use of two-bit (fourlevel) internal quantization. More than single-bit (two-level) quantization introduces the risk of mismatch between current sources, leading to non-linearity of the DAC.…”

Section: I D E S I G Nmentioning

confidence: 99%

“…Figure 7 and Table 1 compare the performance of this circuit to previously published CT BP DSMs. The plot displays SNR versus bandwidth for [4][5][6][7][8][9][10]. The dashed line indicates a line of constant SNR normalized to 1 MHz bandwidth of 72.1 dB.…”

Section: I I M E a S U R E M E N T R E S U L T Smentioning

confidence: 99%

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A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

Karthaus¹,

Ahles²,

Elmaghraby

et al. 2013

Int. J. Microw. Wireless Technol.

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This paper presents a radio frequency (RF) continuous-time band-pass delta sigma modulator (CT BP DSM) receiver realized in a 180 nm SiGe BiCMOS technology. It also provides an introduction to active antenna systems (AAS) for cellular infrastructure base stations, which is the target application for this RF integrated circuit (IC). The internal quantizer and feedback digital to analog converter (DAC) resolution of the CT BP DSM is 2 bit. Without applying DAC linearization techniques such as trimming or dynamic element matching being utilized, measured performance parameters include an SNR and SNDR in 35 MHz bandwidth of 56.7 and 53.7 dB, respectively. IIP3 and noise figure are 26.6 dBm and 10 dB, respectively. No image reception is noticeable within a measurement dynamic range of 83 dB. When driven by single-carrier and three-carrier W-CDMA signals, adjacent channel leakage ratio (ACLR) is 262.6 and 252.1 dB, respectively, making the design also suitable as a modulator for a class-S power amplifier.

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Section: B) Circuit Design: Ct Bp Dsm Versus Zero-intermediate Frequementioning

confidence: 99%

Section: I D E S I G Nmentioning

confidence: 99%

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A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

Karthaus¹,

Ahles²,

Elmaghraby

et al. 2013

Int. J. Microw. Wireless Technol.

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“…Akos et al have developed in [4] a direct RF sampling receiver for multiple frequency bands where the ADC is placed in baseband fron-end. Recently, CT-bandpass ΣΔ modulation is a hopeful method to provide a lower power, high resolution analog to digital converter [5]. The prominent benefit of using a CT-bandpass ΣΔ modulator is the inherent anti-alias filtering [6].…”

Section: Introductionmentioning

confidence: 99%

On the RF subsampling continuous-time ΣΔ downconversion stage for multistandard receivers

Bechir¹,

Bouallègue²

2010

2010 2nd International Conference on Computer Engineering and Technology

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This paper deals with the design and analysis of a new RF subsampling downconversion front-end assigned to propose a multistandard receivers for next wireless generation standards. The RF subsampling front-end is based on continuous time (CT) bandpass ΣΔ modulator with sine-shaped feedback DAC. Much attention is given to frequency sampling selection and non idealities in subsampling CT-bandpass ΣΔ modulator. Thus, the mainly jitter effect on SNR degradation is investigated. Simulation results for a dual-mode GSM and WCDMA receiver based on RF subsampling fourth order CT-bandpass ΣΔ modulator show that the proposed topology can improve the SNR output measurement with low sampling rate.

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“…A major building block in multi-standard highspeed transceivers is the ADC. For RF and high-IF solutions, Continuous-Time Bandpass RD Modulators (CT-BP) are frequently used because at high intermediate frequencies the flicker noise is small compared to that of the quantization noise [1][2][3]. A major issue found in continuous-time networks is the lack of accuracy due to processvoltage temperature tolerances that may lead to over 25% variations on the time constants [1,4,5].…”

Section: Introductionmentioning

confidence: 99%

Digital based calibration technique for continuous-time bandpass sigma-delta analog-to-digital converters

Silva-Rivas

Kode

et al. 2008

Analog Integr Circ Sig Process

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In this paper, a calibration technique for Noise Transfer Function (NTF) optimization of Continuous-Time Bandpass Sigma Delta (CT BP RD) modulators is presented. The proposed technique employs a test tone applied at the input of the quantizer to evaluate the noise transfer function of the Analog-to-Digital Converter (ADC) using the capabilities of the Digital Signal Processing (DSP) platform usually available in mixed-mode systems. Once the ADC output bit stream is captured, necessary information to generate the control signals to tune the ADC parameters for best Signal-to-Quantization Noise Ratio (SQNR) performance is extracted via an LMS softwarebased algorithm. Simulation results show that notch frequency of the NTF due to process variations and temperature tolerances can be tuned using the proposed methodology. The proposed global calibration approach can be used during the system start-up and the idle system time. The proposed approach uses a single in-band calibration tone, but it can be expanded using out-of band test tones for background calibration schemes.

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A Low-Noise 40-GS/s Continuous-Time Bandpass $\Delta\Sigma$ ADC Centered at 2 GHz for Direct Sampling Receivers

Cited by 57 publications

References 17 publications

A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

A 2-bit, 3.1 GS/s, band-pass DSM receiver for active antenna systems

On the RF subsampling continuous-time ΣΔ downconversion stage for multistandard receivers

Digital based calibration technique for continuous-time bandpass sigma-delta analog-to-digital converters

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