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Integrated Digitizer System with Streaming Interface

a technology of integrated digitizer and streaming interface, which is applied in the field of measurement and data acquisition systems, can solve the problems that the technology process required for high-speed adcs is usually not the optimal process for the logic required, and achieve the effect of accurately determining (predicting) and minimizing dead acquisition tim

Active Publication Date: 2015-02-05
NATIONAL INSTRUMENTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a system for acquiring and synchronizing data from different digitizer systems. The system generates additional sideband data that contains information about the timing and status of each acquisition record. This sideband data is transmitted through a separate interface and can be used to correlate data from synchronized acquisitions without synchronizing different interfaces. The system can also react immediately to an acknowledgement event to minimize dead acquisition time between records. The acknowledgement event is used to detect the proper operation of the system and error conditions. Overall, the system improves the speed and accuracy of data acquisition and synchronization.

Problems solved by technology

One common arrangement includes modular ADCs and integrated complete digitizer systems because the technology process required for the high speed ADCs is usually not the optimal process for the logic required for the other components of the system.
While designed for high-speed data, the specification is designed to support a continuous stream of data, as generated by the ADC, and lacks a mechanism to define records of data to be stored by the memory system.

Method used

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  • Integrated Digitizer System with Streaming Interface
  • Integrated Digitizer System with Streaming Interface
  • Integrated Digitizer System with Streaming Interface

Examples

Experimental program
Comparison scheme
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first embodiment

[0059]Several algorithms or variations of an algorithm may be devised to manage the data acquisition process according to the principles described above. In a first embodiment, the memory controller 328 may actually receive a specified number ‘N’ of records. The acknowledgement from expansion module 322 may be sent immediately after the reception of the end of record symbol unless all buffers are full. If / when all buffers are full, memory controller 328 may be instructed to wait until the next buffer is free.

second embodiment

[0060]In a second embodiment, the ASM 310 may be programmed to acquire N records and then wait for the ACK signal from the expansion module 322 to be asserted. The memory controller 328 (and / or DSP 326) may have been previously programmed or instructed to receive these N records and wait for their consumption before sending acknowledgement (i.e. before asserting the ACK signal) to the ASM 310.

third embodiment

[0061]In a third embodiment, the ASM 310 may be programmed to acquire N records before it waits for the ACK signal to be asserted. Memory controller 328 may include a first number (M) of buffers, each buffer holding a second number (N) of records, where ‘M’ and ‘N’ are nonzero integers. The ACK signal may be asserted to the ASM 310 immediately upon the reception of each set of N records, unless all M buffers are in use. If that is the case, the memory controller may be instructed / programmed to wait until at least one buffer is free before asserting the ACK signal to the ASM 310.

[0062]FIG. 7 shows the time flow diagram 700 of a data acquisition process in a system using a digitizer system such as those exemplified in FIGS. 3 and 4, according to one embodiment. As shown in FIG. 7, a state engine 702 may implement control / management of the data acquisition process. State engine may be a finite state machine or programming instruction executed by a controller / processor or any combinatio...

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PUM

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Abstract

A digitizer system (DS) may include one or more input channels to receive sample data, and an acquisition state machine (ASM) to organize the sample data into one or more acquisition records according to events of interest, and generate framing information corresponding to the one or more acquisition records. The events of interest may be identified by a trigger circuit in the DS, and relayed to the ASM for organizing the sample data. The DS may further include a data interface capable of receiving the one or more acquisition records and the framing information, encoding the one or more acquisition records and the framing information into encoded data, and transmitting the encoded data to an expansion module. The expansion module may receive the encoded data, decode the encoded data, and recover the sample data from the decoded data according to the framing information and the one or more acquisition records.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates generally to measurement and data acquisition systems and, more particularly, to a data acquisition system with an improved integrated digitizer having a streaming interface.[0003]2. Description of the Related Art[0004]Measurement systems are oftentimes used to perform a variety of functions, including measurement of a physical phenomena, measurement of certain characteristics or operating parameters of a unit under test (UUT) or device under test (DUT), testing and analysis of physical phenomena, process monitoring and control, control of mechanical or electrical machinery, data logging, laboratory research, and analytical chemistry, to name a few examples.[0005]A typical contemporary measurement system comprises a computer system, which commonly features a measurement device, or measurement hardware. The measurement device may be a computer-based instrument, a data acquisition device or board, a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03M7/00G04F10/00
CPCG04F10/00H03M7/00G05B17/02G06F13/28
Inventor CASTRO SCORSI, RAFAELPATEL, KUNAL H.RUBIO, HECTOR
Owner NATIONAL INSTRUMENTS