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Crystal oscillator with controllable pulse width

A crystal oscillator and pulse width technology, applied in electrical components, impedance networks, etc., can solve problems such as poor output oscillation frequency stability, and achieve the effect of good stability and controllable pulse width.

Active Publication Date: 2013-07-03
DONGGUAN KASADI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned oscillator has the defect that the stability of the output oscillation frequency is relatively poor

Method used

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  • Crystal oscillator with controllable pulse width
  • Crystal oscillator with controllable pulse width
  • Crystal oscillator with controllable pulse width

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one, such as Figure 4 and Figure 5 As shown, a crystal oscillator with controllable pulse width includes an inverter 1, a mechanical resonator 2, and a current limiting device 3 that has current unidirectionality and can limit the magnitude of the current. The inverter 1 is connected in parallel with a bias Piezoresistor R1, one terminal of the mechanical resonator 2 is connected to the input terminal of the inverter 1, and the other terminal of the mechanical resonator 2 is connected to the output terminal of the inverter 1 through a series connection of the current limiting resistor R2 , the two terminals of the mechanical resonator 2 are connected in parallel with the current limiting device 3, the mechanical resonator 2 is equipped with a resonator load capacitor C1 and a resonator load capacitor C2, one of the terminals of the resonator load capacitor C1 is connected to the mechanical One of the terminals of the mechanical resonator 2 is connected, on...

Embodiment 2

[0033] Embodiment two, such as Figure 6 As shown, the difference between the second embodiment and the first embodiment is that the current limiting device 3 is equipped with a variable current limiting resistor RP, and one terminal of the current limiting device 3 is connected in series with the variable current limiting resistor RP and the mechanical Resonator 2 is connected to the corresponding terminals.

[0034] The crystal oscillator in the second embodiment can obtain the required output pulse width by adjusting the size of the variable current limiting resistor RP, wherein the smaller the resistance value of the variable current limiting resistor RP, the larger the output pulse width; The larger the resistance value of the variable current limiting resistor RP, the smaller the output pulse width.

[0035] As in the first embodiment, the current limiting device 3 in the second embodiment can be connected in parallel with the mechanical resonator 2 in the reverse direc...

Embodiment 3

[0036] Embodiment three, such as Figure 7 and Figure 8 As shown, the difference between the third embodiment and the first embodiment is that the current limiting device 3 is equipped with a photocoupler 4 . During the use of the third embodiment, the output pulse width can also be controlled by adjusting the current of the optocoupler 4, and electrical isolation control can be realized and is suitable for a closed-loop system. Such as Figure 7 As shown, the larger the forward current flowing into the photocoupler 4, the larger the output pulse width; correspondingly, the smaller the forward current flowing into the photocoupler 4, the smaller the output pulse width.

[0037] Such as Figure 8 As shown, the photocoupler 4 is reversely connected to the current limiting device 3, the greater the forward current flowing into the photocoupler 4, the smaller the output pulse width; correspondingly, the more forward current flowing into the photocoupler 4 Smaller, the larger ...

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Abstract

The invention discloses a crystal oscillator with controllable pulse width. The crystal oscillator with the controllable pulse width comprises a phase inverter, a mechanical resonator and a current-limiting device, wherein the phase inverter is connected with a bias resistor R1 in parallel; one connecting terminal of the mechanical resonator is connected with an input end of the phase inverter, the other connecting terminal of the mechanical resonator is connected with an output end of the phase inverter via a series current-limiting resistor R2, and the two connecting terminals of the mechanical resonator are connected with the current-limiting device in parallel; and the mechanical resonator is assembled with a resonator load capacitor C1 and a resonator load capacitor C2. According to the crystal oscillator with the controllable pulse width disclosed by the invention, the output pulse width of the crystal oscillator is controlled by changing the current of the current-limiting device, and then the needed output pulse width is obtained; the higher the through current value of the current-limiting device is, the larger the output pulse width is; and additionally, an output waveform can be phase-inverted by changing the current through direction of the current-limiting device. Therefore, the crystal oscillator with the controllable pulse width disclosed by the invention has the advantages of being good in stability and controllable in pulse width.

Description

technical field [0001] The invention relates to the technical field of oscillators, in particular to a crystal oscillator with controllable pulse width. Background technique [0002] As a switching inverting device, the NOT gate can be used to form various pulse waveform generating circuits; when the resonant device is an RC component, the basic working principle of the circuit is to use the charging and discharging of the capacitor, when the input voltage reaches the threshold voltage of the NAND gate When VT, the output state of the gate changes; among them, the parameters of the pulse waveform output by the circuit directly depend on the value of the resistance-capacitance element in the circuit. [0003] figure 1 It is a symmetrical multivibrator. Since the circuit is completely symmetrical, the charge and discharge time constant of the capacitor C2 is the same; therefore, the symmetrical multivibrator outputs a symmetrical square wave; if the resistance values ​​of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/205
Inventor 朱军方思敏
Owner DONGGUAN KASADI ELECTRONICS TECH CO LTD