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Electronic device, wireless communication device and method of controlling operation of delta-sigma adc

An electronic device and operational technology, applied in electrical components, code conversion, transmission systems, etc., can solve the problems of integrated circuit delta-sigma ADC performance instability, performance degradation, quantizer stage overload, etc.

Active Publication Date: 2021-09-07
ANALOG DEVICES INT UNLTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The magnitude of the input voltage may limit the performance instability of the integrated circuit delta-sigma ADC
As the amplitude increases, the quantizer stage may be overloaded, resulting in a decrease in performance

Method used

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  • Electronic device, wireless communication device and method of controlling operation of delta-sigma adc
  • Electronic device, wireless communication device and method of controlling operation of delta-sigma adc
  • Electronic device, wireless communication device and method of controlling operation of delta-sigma adc

Examples

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Embodiment Construction

[0010] figure 1 is a block diagram of an example of a first order unit delta-sigma ADC. ADC105 takes sampling clock frequency Kf s A certain rate converts the input signal (u(t)) into a continuous serial stream of 1s and 0s. A 1-bit digital-to-analog converter (DAC) 102 is driven by the serial output data stream to generate a feedback signal. The output of DAC 102 is subtracted from the input signal using summing element 104 . Typically, summing element 104 is implemented as a summing junction of an operational amplifier (op-amp), such as an operational amplifier of integrator 106 . Integrator 106 integrates the output of summing element 104 and the output of integrator 106 is applied to clock latched comparator 108 to produce a 1-bit ADC at the output.

[0011] A delta-sigma ADC circuit can quantize an analog input to a digital value using a comparator. For example, for a 1-bit converter, the quantizer determines whether the input voltage has a value of one or zero. As ...

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Abstract

The present disclosure relates to methods and apparatus for increasing dynamic range in delta-sigma ADCs using built-in feedback across all integrators in a loop filter. The device includes a delta-sigma analog-to-digital converter (ADC) and baseband processing circuitry. A delta-sigma ADC includes a plurality of integrator stages connected in series, including: a first integrator stage operatively coupled to an input of the delta-sigma ADC; a main quantization circuit, including a main ADC circuit and a main digital-to-analog converter (DAC) circuit, wherein an input of a main ADC circuit operatively coupled to the plurality of integrator stages; and a first feedback circuit path from an output of the first integrator stage operatively coupled to an input of a delta-sigma ADC, wherein the first feedback circuit path is configured is the output voltage of the first integrator stage subtracted from the input of the delta-sigma ADC. The baseband circuit is configured to activate the first feedback circuit path when an increase in input voltage is detected to cause distortion in the delta-sigma ADC.

Description

Background technique [0001] The electronic system may include an analog-to-digital (A / D) converter (ADC). Converting an analog signal to a digital quantity allows the processor of an electronic system to perform signal processing functions on the system. A delta-sigma ADC is a type of ADC that is widely used to convert signals in the audio frequency band, precision industrial measurement applications, and narrowband Internet of Things (IoT) applications. The magnitude of the input voltage can limit the performance instability of integrated circuit delta-sigma ADCs. As the amplitude increases, the quantizer stages can become overloaded, resulting in degraded performance. The inventors recognized a need to improve the dynamic range of delta-sigma ADCs. Contents of the invention [0002] The present invention relates generally to delta-sigma analog-to-digital converter (ADC) circuits, and more particularly to improving the dynamic range of ADC circuits. Exemplary devices in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M3/00
CPCH03M3/358H03M3/452H03M3/454H03M3/488H04B1/0017
Inventor D·班纳吉
Owner ANALOG DEVICES INT UNLTD