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Sigma-delta modulator

A technology of modulators and regulators, applied in code conversion, electrical components, transmission systems, etc., can solve problems that cannot be integrated in small and compact wireless telecommunication equipment, high complexity of ΣΔADC circuits, and inability to use them

Active Publication Date: 2019-06-28
SORBONNE UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Tuning of these ΣΔ ADCs is very complex, and due to this complexity, the tuning range may be limited
Therefore, tuning these modulators for higher frequencies would mean higher complexity, higher power consumption, and larger size for the ΣΔ ADC circuit
As a result, such ΣΔ ADCs cannot be used in a wide variety of applications, or small enough to be integrated in small and compact wireless telecommunication equipment

Method used

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Examples

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Embodiment Construction

[0035] Several embodiments of the ΣΔ ADC will be described in detail below with reference to the accompanying drawings.

[0036] Figure 4 is a schematic diagram of an embodiment of a ΣΔ ADC 400 according to the present disclosure. ΣΔ ADC 400 at sampling frequency f s will have a variable center frequency around f 0 The frequency bandwidth of the analog input signal 401 is converted into a digital output signal 422 . The ΣΔ ADC 400 is a circuit comprising a loop including a forward path 460 for generating digital output signals 421 and 422 from an analog input signal 401, and for generating one or more feeds from the delayed digital output signal 422 Feedback path 470 for the feedback signals 403, 404, 405 of the forward path. ΣΔ ADC 400 can be used to implement the reference figure 1 The ADC 11 of the RF receiver 100 is depicted.

[0037] The loop includes a loop filter comprising one or more sub-filters 410 , an adjustable delay element 455 , and one or more DACs 451 ,...

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Abstract

A Sigma-Delta ([Sigma][Delta]) modulator for converting an analog input signal having a frequency bandwidth around a variable center frequency f 0 to a digital output signal at a sampling frequency fs . The [Sigma][Delta] modulator comprises a quantizer (420) for generating the digital output signal and a loop filter for shaping the quantization noise. The loop filter comprises at least one subfilter (430, 410) centered around a frequency f0 and constant noise shaping coefficients (451, 452, 453). The [Sigma][Delta] modulator further comprises a tunable delay element (455), a frequency adjuster (480) for adjusting the sampling frequency f s such that the normalized center frequency f0 / fs is constant, and a delay adjuster (490) for adjusting the loop delay td implemented by the quantizer and the tunable delay element (455), such that the normalized loop delay td / Ts falls in a predetermined range [tmin,tmax], where Ts=1 / fs.

Description

technical field [0001] The present disclosure relates to sigma-delta modulators (Sigma-Delta modulators), analog-to-digital converters, and methods of converting analog signals to digital signals using sigma-delta modulators. Background technique [0002] Sigma-delta modulators are used to implement radio frequency (RF) receivers in many different types of wireless telecommunications equipment. These wireless telecommunication devices can be used in several applications such as Software Defined Radio (SDR), Cognitive Radio (CR), Internet of Things (IoT) and base stations or cellular telephones. These wireless telecommunication devices, for example, comply with different wireless telecommunication standards including GSM / GPRS, EDGE, UMTS, LTE, Wi-Fi, ZigBee, Bluetooth, etc. and therefore must be able to convert analog input signals with various frequency ranges. [0003] already described figure 1 is a schematic diagram of an embodiment of a highly digitized RF receiver 100...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M3/00
CPCH03M3/396H03M3/424H03M3/402H04B1/0014H04B1/0021H03M3/43H03M3/496
Inventor H·阿布沙迪T·巴德兰A·萨叶德
Owner SORBONNE UNIV
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