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An apparatus and method for multi-phase digital sampling

A reference signal and frequency technology, applied in the field of measuring the input frequency relative to the reference signal, can solve the problem of not providing linear output and so on

Inactive Publication Date: 2011-06-22
III HLDG 12 LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these typical solutions do not provide a linear output (i.e., an indication of how much higher or lower the input is relative to a reference) when doing frequency comparisons

Method used

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  • An apparatus and method for multi-phase digital sampling
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  • An apparatus and method for multi-phase digital sampling

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Embodiment Construction

[0028] Embodiments of the present invention are described herein in conjunction with an apparatus and a method for determining an input frequency. Those skilled in the art will appreciate that the following detailed description of the invention is exemplary only and not restrictive in any way. Other embodiments of the invention will readily occur to those skilled in the art with the aid of this disclosure. Reference will now be made in detail to the embodiments of the invention illustrated in the accompanying drawings. Throughout the drawings and the following detailed description, the same reference numbers will be used to refer to the same or like parts.

[0029] In the interest of clarity, not all typical features of the implementations are shown and described herein. Of course, it should be recognized that in developing any such practical implementation, many specific implementations must be made to achieve the developer's specific goals (such as compliance with applicat...

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Abstract

A method and apparatus for determining a relationship between an input signal frequency and a reference signal frequency is envisioned. The system derives a plurality of internal reference signals from the reference signal. The internal reference signals are provided to a level detection circuit which in turn samples the input signal a number of times within a period of time. Values associated with these samples are stored, as is one value of a sample from a previous period. The stored samples are correlated, and a relationship between the input signal frequency and the reference signal frequency is derived.

Description

field of invention [0001] The present invention relates to digital sampling in electronic circuits. In particular, the invention relates to measuring an input frequency relative to a reference signal. Background technique [0002] In many applications, a waveform needs to be sampled to determine its characteristics, including its frequency or phase. There are several basic solutions to these problems. In a typical solution, analog components are used to obtain the comparison of the input and reference signals, including the magnitude and sign of the difference. [0003] However, this typical solution suffers from the disadvantage of inaccurate comparison of analog components because these components are inherently time-limited, including substandard responses and / or delays. [0004] In other typical solutions, digital logic components are used. However, these typical solutions do not provide a linear output (ie, an indication of how much higher or lower the input is rela...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/00H03D13/00
CPCH03D13/00G01R23/005
Inventor W·桑德
Owner III HLDG 12 LLC