A 0.25-mW low-pass passive sigma-delta modulator with built-in mixer for a 10-MHz IF input

Chen, F.; Leung, Bosco

doi:10.1109/4.585244

Cited by 74 publications

(44 citation statements)

References 7 publications

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“…9 10 and some of these are pointed out in the figure. These power-efficient converters utilize four architectures: flash (low resolution only) [23], [24], folded-flash [12], [25], pipelined [26]- [29], and modulation [30]- [33]. These particular modulators, in contrast to the GHz circuits mentioned above, were designed in CMOS using switchedcapacitors and are oriented toward lower frequency applications.…”

Section: Low-power Adc Architecturesmentioning

confidence: 99%

Analog-to-digital converter survey and analysis

Walden

1999

IEEE J. Select. Areas Commun.

1,837

959

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Abstract-Analog-to-digital converters (ADC's) are ubiquitous, critical components of software radio and other signal processing systems. This paper surveys the state-of-the-art of ADC's, including experimental converters and commercially available parts. The distribution of resolution versus sampling rate provides insight into ADC performance limitations. At sampling rates below 2 million samples per second (Ms/s), resolution appears to be limited by thermal noise. At sampling rates ranging from 2 Ms/s to 4 giga samples per second (Gs/s), resolution falls off by 1 bit for every doubling of the sampling rate. This behavior may be attributed to uncertainty in the sampling instant due to aperture jitter. For ADC's operating at multi-Gs/s rates, the speed of the device technology is also a limiting factor due to comparator ambiguity. Many ADC architectures and integrated circuit technologies have been proposed and implemented to push back these limits. The recent trend toward single-chip ADC's brings lower power dissipation. However, technological progress as measured by the product of the ADC resolution (bits) times the sampling rate is slow. Average improvement is only 1.5 bits for any given sampling frequency over the last six-eight years.Index Terms-Analog-to-digital converters, aperture jitter, comparator ambiguity, input-referred noise, signal-to-noise ratio, spurious-free dynamic range.

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Section: Low-power Adc Architecturesmentioning

confidence: 99%

Analog-to-digital converter survey and analysis

Walden

1999

IEEE J. Select. Areas Commun.

1,837

959

View full text Add to dashboard Cite

show abstract

“…The gain factor G in a conventional active modulator is estimated as unity [12] assuming the integrators swing is maintained close to the reference voltage. In a passive modulator the signal swing at the quantizer input is much weaker than the reference level, due to the successive attenuation by the passive filters [1][2][3], resulting in a non-unity G. This gain is lumped into the comparator input, according to Fig. 1, and is a function of the passive filter's pole location [3].…”

Section: System-level Considerationsmentioning

confidence: 99%

“…Delta-sigma modulator is a powerful ADC technique because of its higher accuracy in low-speed applications (e.g., medical applications). Passive integrator, as an alternative to the power-hungry active integrator, is a significant approach in the design of low-power and low-voltage delta-sigma (ΔΣ) modulators for reducing the analog power consumption [1][2][3][4][5][6]. However, due to the lack of DC gain inside the passive filter (or integrator), the modulator is sensitive to noise coupling, thereby affecting the signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

“…However, due to the lack of DC gain inside the passive filter (or integrator), the modulator is sensitive to noise coupling, thereby affecting the signal-to-noise ratio (SNR). Modulators in [1] and [2] employ switched-capacitor (SC) gain-boosted passive filter to somewhat compensate for the lack of gain. However, achieving very high gain requires unrealistically large capacitive area as well as high sensitivity to parasitic capacitances [3].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Low-Power Low-Voltage ΔΣ Modulator Using Switched-Capacitor Passive Filters

Yeknami

Alvandpour

2015

IFIP Advances in Information and Communication Technology

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“…Passive sigma-delta (Σ∆) analog-to-digital modulators [1,2] are a very attractive way to build very-low consumption analog to digital (A/D) converters. In these modulators, the active low-pass filters which are generally used for sigmadelta conversion are replaced by passive ones.…”

Section: Introductionmentioning

confidence: 99%