2006
DOI: 10.1007/s10470-006-9068-7
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A low-power sigma-delta modulator for wireless communication receivers using adaptive biasing circuitry and cascaded comparator scheme

Abstract: This paper represents the low-power signal-delta ( ) modulator for wireless communication receiver applications. The 2nd-order modulator has a single-loop structure with 11 quantization levels. An adaptive biasing scheme of the operational amplifier and cascaded comparator scheme are proposed in order to save the power consumption. The DAC with three-level references including the analog ground voltage can make the modulator be implemented with half of the input capacitances without degradation of linearity ch… Show more

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Cited by 11 publications
(4 citation statements)
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“…Note that the presented prototype compares favourably to the ICs reported in [4], [7], and [8], and it also achieves a performance comparable to that in [3], being thus competitive with the current state of the art. …”
Section: Resultsmentioning
confidence: 65%
See 1 more Smart Citation
“…Note that the presented prototype compares favourably to the ICs reported in [4], [7], and [8], and it also achieves a performance comparable to that in [3], being thus competitive with the current state of the art. …”
Section: Resultsmentioning
confidence: 65%
“…Also, the mandatory use of low oversampling in wideband applications typically forces the ΣΔM to achieve the required dynamic ranges by resorting to high-order shaping [3] [7] [9], to multi-bit embedded quantizers [4] [8], or both [6]. Thus, additional strategies to optimize the performance of a multi-mode ΣΔM for wideband standards can be found in the use of cascade architectures whose back-end stages can be switched on/off [6] or in the programming of notches within the signal band [3] [9].…”
Section: Introductionmentioning
confidence: 99%
“…A detailed analysis on the overall receiver chain, determining the impact of interferers and establishing the specifications for each block is beyond the scope of this work. Therefore, a research on ADC specifications was performed, based on several publications on this area [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27], where the ADC specifications for each standard were established, Table 1.…”
Section: Adc Specificationsmentioning
confidence: 99%
“…Therefore, several publications have been presented through recent years regarding this issue, thus emphasizing the importance of multi-standard receivers. However, the majority of these publications focused on low-medium bandwidth standards [9][10][11][12][13]15,17,19,21,23,24], supporting essentially GSM and WCDMA standards. Recently, new converters were introduced in order to improve the bandwidth and therefore to be able to cope with WLAN requirements [14,16,18,20,22,[25][26][27].…”
Section: State-of-the-artmentioning
confidence: 99%