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Compressive Sensing Based Reconstruction Algorithm for Non-Uniform Sampling Based Data Converters

A compressed sensing, sample technology, applied in analog/digital conversion, code conversion, instrumentation, etc.

Active Publication Date: 2017-08-11
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This type of penalty exists for almost every application that employs data compression

Method used

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  • Compressive Sensing Based Reconstruction Algorithm for Non-Uniform Sampling Based Data Converters
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  • Compressive Sensing Based Reconstruction Algorithm for Non-Uniform Sampling Based Data Converters

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Embodiment Construction

[0032] Referring now to the drawings, wherein for the sake of clarity, depicted elements are not necessarily drawn to scale, and wherein like or similar elements are designated by like reference numerals throughout the several views.

[0033] go to figure 1 , an example of a system 100 employing a CS-SAR ADC can be seen. In this example, the SAR ADC generally includes a sample-and-hold (S / H) circuit 102, a comparator 104, SAR logic 106, and a capacitive digital-to-analog converter (CDAC) 108, and the controller generally includes a processor 110 (which may be, for example, a digital signal processor or DSP) and memory 112 . In operation, SAR logic 106 substantially randomly selects the resolution used to convert each sample from S / H circuit 102 (which may be, for example, an S / H amplifier). The comparator 104 operates when the clock signal CLK (which is generated by the sequential circuit in the processor 110 or the controller and has a cycle T longer than the sampling cloc...

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Abstract

Compressed sensing is an emerging field that attempts to prevent the losses associated with data compression and improve overall efficiency, and compressive sensing performs compression before or during capture so that no energy is wasted. Here, a reconstruction algorithm is proposed for compressed sensing successive approximation register SAR analog-to-digital converter ADC. Thus, an analog signal is converted to a first digital signal at a sampling frequency that is less than the Nyquist frequency of the analog signal, and a second digital signal is constructed from the first digital signal by a box-constrained linear optimization process. digital signal such that the second digital signal is approximately equal to the analog-to-digital conversion of the analog signal at the Nyquist frequency of the analog signal.

Description

technical field [0001] This disclosure relates generally to analog-to-digital converters (ADCs), and more particularly, to compressive sensing ADCs (CS-ADCs). Background technique [0002] Digital compression has become ubiquitous and has been used in a wide variety of applications, such as video and audio applications. When image capture (ie, photography) is taken as an example, an image sensor (ie, charge-coupled device or CCD) is employed to generate analog image data, and an ADC is used to convert this analog image into a digital representation. This type of digital representation (which is raw data) can consume a large amount of storage space, so algorithms are employed to compress the raw (digital) image into a more compact format (ie Joint Photographic Experts Group or JPEG). Performing compression after an image has been captured and converted to a digital representation wastes energy (ie, battery life). This type of penalty exists for almost every application that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/38
CPCH03M1/1265H03M7/00H03M7/3062
Inventor 查尔斯·K·塞斯托克安德鲁·沃特斯
Owner TEXAS INSTR INC