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Method and apparatus for time-differential comparison of an analog signal

An analog comparator and differential technology, applied in the field of analog signals, can solve unrealistic problems

Inactive Publication Date: 2013-01-23
POWER INTEGRATIONS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While this technique is usually not practical for simple low-cost systems that do not require analog-to-digital conversion and digital memory in their control circuits

Method used

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  • Method and apparatus for time-differential comparison of an analog signal
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  • Method and apparatus for time-differential comparison of an analog signal

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Embodiment Construction

[0013] An example related to implementing a time domain differential comparison of analog signals according to the present invention is disclosed. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the specific details need not be employed to practice the invention. In other instances, well-known materials or methods have not been described in detail in order not to obscure the invention.

[0014] Reference throughout this specification to "one embodiment," "an embodiment," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention . Thus, appearances of the phrases "in one embodiment," "in an embodiment," "in one example," or "in an example" in various places throughout this specification are not n...

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Abstract

A time-differential analog comparator is disclosed. An example apparatus according to aspects of the present invention includes a source of a variable frequency signal having a frequency responsive to an analog input. A counting circuit is coupled to count cycles of the variable frequency signal. The counting circuit is coupled to count in a first direction for a first time interval and is coupled to count in a second direction opposite to the first direction for a second time interval that occurs after an end of the first time interval. An evaluation circuit is coupled to the counting circuit. The evaluation circuit is responsive to the count of the cycles of the variable frequency signal after an end of the second time interval.

Description

technical field [0001] The present invention relates generally to analog signals, and more particularly, the present invention relates to processing analog signals. Background technique [0002] A traditional comparator makes a comparison between the instantaneous value of an analog signal and a reference value. A time-differential analog comparator compares the value of an analog signal acquired in a current time interval with the value of the same analog signal acquired in a past time interval. This can be used in some electronic circuit applications to know whether a slowly varying quantity has changed much for a circuit over a considerable period of time. [0003] Electronic circuits generally use components that are optimized to operate at high speeds, responding to events that occur in a very short period of time. These circuits are typically used in applications that control slowly changing processes that take a long time to respond. For example, components of micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B1/02
CPCG01R19/12H03K5/24H03M1/60
Inventor 威廉姆·M·波利夫卡
Owner POWER INTEGRATIONS INC