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Event-driven analog/digital converter and compressed sampling method thereof

An event-driven, digital converter technology, applied in analog-to-digital converters, code conversion, electrical components, etc., can solve the problems of increasing chip area, chip power consumption, system noise, etc., to facilitate signal restoration, optimize input noise, reduce The effect of circuit power dissipation

Active Publication Date: 2015-03-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to be able to change the upper and lower bounds of the threshold, two digital-to-analog converters (DACs) are used in its circuit implementation, which increases the chip area and power consumption of the chip; There must be a certain deviation in the problem, which will also bring some noise to the system

Method used

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  • Event-driven analog/digital converter and compressed sampling method thereof
  • Event-driven analog/digital converter and compressed sampling method thereof
  • Event-driven analog/digital converter and compressed sampling method thereof

Examples

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Embodiment 1

[0071] Such as Figure 1-10 As shown, the event-driven analog / digital conversion module of this embodiment includes: 1bit digital / analog converter 1, direction comparator 2, direction control logic 3, multiplexer 4, cross comparator 5, sawtooth control logic 6. Time measurer 7, threshold generator control logic 8 and threshold generator 9.

[0072] The analog signal to be converted V in Input to 1bit digital / analog conversion module 1, the circuit diagram of 1bit digital / analog conversion module 1, as shown image 3 As shown, under certain conditions, the analog signal V to be converted in Converted into a sawtooth signal V located between the upper and lower thresholds VH and VL on , Output to direction comparator 2 and multiplexer 3; direction comparator 2 will sawtooth signal V on And threshold median V m =(VH+VL) / 2 compare to determine the direction of change of the received signal, when V on > V m Is increasing when V on m When the time is decreasing, the output directio...

Embodiment 2

[0076] This embodiment provides a method for measuring time interval in an analog manner. The circuit diagram of the analog measurement time interval module T2V is as follows figure 2 As shown, it includes: a constant current source for generating electric charge; a capacitor for receiving the electric charge generated by the constant current source; a cut-off switch Used to control whether the constant current source charges the capacitor; reset switch Used to reset the charge on the capacitor. Since the voltage of the capacitor U=Q / C, and the charge accumulated on the capacitor Q=It, where I is the current of the constant current source, U=IΔt / C. That is, the voltage on the capacitor is proportional to time. For example: when a pulse signal representing an event passes, the cut-off switch is opened and the reset switch is closed At this time, the stored charge on the capacitor is released and the voltage becomes zero. When the pulse leaves (triggered on the falling edge o...

Embodiment 3

[0079] This embodiment describes in detail the compressed sampling method using the event-driven A / D converter of the present invention, and its operation flowchart and sampling process are as follows Picture 11 , 12 As shown, the specific steps are as follows:

[0080] S41: Convert the analog signal V to be converted in Transform into sawtooth transform signal V on ;

[0081] S42: Transform the sawtooth signal V on And threshold median V m (V m =(VH+VL) / 2) compare and judge the sawtooth signal V on The direction of change (is it increasing or decreasing), when V on > V m Is increasing when V on m Time is decreasing;

[0082] S43: According to the sawtooth signal V on The sawtooth signal and the upper threshold of the threshold or the sawtooth signal and the lower threshold of the threshold are output; when the signal change direction is increasing, the sawtooth signal V on And the threshold upper limit VH output, when the signal change direction is decreasing, the sawtooth s...

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Abstract

The invention discloses an event-driven analog / digital converter and a compressed sampling method of the event-driven analog / digital converter. The converter comprises a 1-bit digital / analog converter, a direction comparator, a direction control logic, a multiplexer, a crossing comparator, a sawtooth control logic, a time measurer, a threshold value generator control logic and a threshold value generator. The compressed sampling method comprises the steps that S41, an analog signal is converted into a sawtooth signal; S42, the change direction of the sawtooth signal is judged; S43, the sawtooth signal and a threshold value upper bound or threshold value lower bound are output; S44, the sawtooth signal is compared with the threshold value upper bound or threshold value lower bound, whether a sampling action is triggered is judged, if yes, the S45 is executed, and if not, the S44 is executed again; S45, the sampling action is triggered, and sampled pulse signals are generated; S46, the time interval of the sampled pulse signals is measured, and a threshold value interval is changed according to the time interval. The event-driven analog / digital converter reduces circuit area and is low in system noise and low in power consumption.

Description

Technical field [0001] The present invention relates to the field of analog / digital converters, in particular to an event-driven analog / digital converter and a compression sampling method thereof. Background technique [0002] The sensor network is the interface between the real world and the computer world. It is through the sensor network that people can understand and change the real world faster and more accurately, thereby promoting the development of society. Because of its importance, some experts pointed out that the entire semiconductor industry will also be promoted by it for a long period of time in the future. However, in some applications, large-scale deployment of sensor nodes and long-term signal detection are required. For battery-powered sensor nodes, ultra-low power consumption technology will greatly extend the service life of the entire network and reduce labor costs due to frequent battery replacement. At the same time, how to make sensor nodes work in ultr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12H03M7/30
Inventor 田震震刘博晓应忍冬王国兴
Owner SHANGHAI JIAO TONG UNIV
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