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Narrow pulse filter circuit

A narrow pulse and circuit technology, which is applied in the field of pulse signal processing circuits, can solve problems such as the influence of narrow pulse filtering

Active Publication Date: 2019-08-06
邳州市鑫盛创业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the algorithm is processed after sampling by the MCU, the MCU itself is easily affected by various interferences, which affects the filtering of narrow pulses

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 5

[0047] In Embodiment 5, the charge resistor and discharge resistor connected in parallel with the fast discharge diode and the fast charge diode respectively are cancelled, and are replaced by the charge and discharge resistor R51 connected in parallel with the input pulse terminal E1 and the input terminal E2 of the Schmidt circuit. This circuit is a special case where the charging resistor and the discharging resistor are the same, which can simplify the circuit structure.

[0048] Figure 8 Shown is Embodiment 6 of the narrow pulse filtering circuit. In Embodiment 6, the fast discharge diode is a diode D61, the fast charge diode is a diode D62, the fast discharge switch and the fast charge switch are digitally controlled multi-channel analog switches T61; the capacitor is a capacitor C61, and one end of the capacitor C61 is connected to a Schmitt circuit The input end of F61 is the input end F2 of F61, and the other end is connected to the common ground; the multi-channel ...

Embodiment 6

[0049] In Embodiment 6, the charging and discharging resistors connected in parallel with the fast-discharging diode and the fast-charging diode respectively are canceled and replaced by the charging and discharging resistor R61 connected in parallel with the input pulse terminal F4 and the Schmidt circuit input terminal F2. This circuit is also a special case where the charging resistor and the discharging resistor are the same, which can simplify the circuit structure.

[0050] The narrow pulse filter circuit allows positive pulses with a width greater than T1 and negative pulses with a width greater than T2 to pass through.

[0051] The input signal of the Schmidt circuit is the voltage on the capacitor, therefore, the Schmidt circuit is required to have a high input impedance characteristic. Schmitt circuit can choose CMOS Schmitt inverter CD40106, 74HC14 with high input impedance characteristics, or choose CMOS Schmitt NAND gate CD4093, 74HC24 and other devices with high ...

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Abstract

The present invention discloses a narrow pulse filter circuit. The narrow pulse filter circuit includes a rapid discharge circuit, a rapid charging circuit, a capacitor, and a Schmitt circuit. An output pulse of the narrow pulse filter circuit controls the rapid discharge circuit and the rapid charging circuit by using an analog switch or a multiplexing analog switch, one route input pulse is selected for discharging or charging the capacitor, and a signal on the capacitor passes the Schmitt circuit, so that an output pulse is obtained. The narrow pulse filter circuit can automatically filter positive narrow pulse interference in a negative width pulse period and negative narrow pulse interference in a positive width pulse period, particularly, can filter continuous narrow pulse interference signals; and maximum widths of the positive narrow pulse and the negative narrow pulse that need to be filtered can be adjusted by changing a charging time constant and a discharging time constant respectively. The narrow pulse filter circuit can be applied to all occasions in which the narrow pulse interference signal needs to be filtered in a digital signal circuit.

Description

technical field [0001] The invention relates to a pulse signal processing circuit, in particular to a narrow pulse filter circuit. Background technique [0002] In digital signal circuits, it is often necessary to filter the positive narrow pulse and negative narrow pulse in the pulse signal, for example, filter a single narrow interference pulse, filter the shaking pulse of a mechanical switch, and so on. At present, the commonly used method is to use a filter circuit for filtering, or use an MCU to sample and perform algorithm processing. Filtering circuit is used to filter. When the frequency of the narrow pulse to be filtered is high, the filter circuit has a DC memory effect, and the previous narrow pulse will affect the filtering of the latter narrow pulse. When the algorithm is processed after sampling by the MCU, the MCU itself is easily affected by various interferences, which will affect the filtering of narrow pulses. Contents of the invention [0003] In orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K5/1252
CPCH03K5/1252
Inventor 郭艳杰凌云曾红兵
Owner 邳州市鑫盛创业投资有限公司
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