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External frequency detection circuit

A technology of frequency detection circuit and drive circuit, which is applied in the direction of frequency measurement device, etc., can solve the problems of high cost, complex circuit, and many input pins, and achieve the effect of low cost and simple circuit structure

Active Publication Date: 2022-05-20
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, many input pins are required in the conversion process, the circuit is relatively complex, and the cost is high

Method used

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Embodiment Construction

[0022] The present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, like elements are designated by like reference numerals. For the sake of clarity, various parts in the figures have not been drawn to scale. Additionally, some well-known parts may not be shown.

[0023] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0024] like figure 1 Shown is a system block diagram for implementing external frequency detection with a single input pin in an embodiment of the present invention.

[0025] like figure 1 As shown, in order to realize the frequency detection of the external trigger signal, the embodiment of the present invention uses an intermediate function conversion circuit to convert the externally input trigger signal to obtain a pulse signal that is easier to measure, and then output to the internal frequency detection module. In the embod...

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Abstract

The invention discloses an external frequency detection circuit. Including: a clock signal generation module, used to convert the trigger signal into a synchronous clock signal; and an enable signal generation module, used to convert the trigger signal into an enable signal; wherein, the clock signal generation module and the enable signal The generation module is connected to a common signal input terminal to receive a trigger signal, and simultaneously generates the synchronous clock signal and the enable signal according to the trigger signal. The external frequency detection circuit of the present invention has a simple circuit structure, can realize detection from negative pressure to high voltage, and can still detect a clock signal and generate an enabling signal under the condition of ensuring negative pressure.

Description

technical field [0001] The invention relates to the technical field of frequency detection, and more particularly to an external frequency detection circuit. Background technique [0002] In real life, more and more need to perform frequency detection on some external signals, and the detection method is mainly to perform a series of conversion on the trigger signal, which can be recognized by some frequency detection circuits. For example, the trigger signal is converted into a clock signal synchronized with it, and then the frequency of the clock signal is indirectly obtained after the frequency of the clock signal is detected. However, many input pins are required in the conversion process, the circuit is relatively complex, and the cost is high. Therefore, it has become inevitable to reduce the input pins of the circuit and simplify the circuit structure. SUMMARY OF THE INVENTION [0003] In order to solve the above technical problems, the present invention provides ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 王宇易新敏
Owner SG MICRO