CN203377840U - Different crystal load matching circuit in crystal oscillator and IC - Google Patents
Different crystal load matching circuit in crystal oscillator and IC Download PDFInfo
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- CN203377840U CN203377840U CN201320378130.XU CN201320378130U CN203377840U CN 203377840 U CN203377840 U CN 203377840U CN 201320378130 U CN201320378130 U CN 201320378130U CN 203377840 U CN203377840 U CN 203377840U
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- oscillator
- crystal
- load matching
- matching circuit
- crystal oscillator
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Abstract
The utility model discloses a different crystal load matching circuit in a crystal oscillator and an IC. The circuit comprises crystal oscillators, the IC and load matching circuits. The crystal oscillators are arranged on both ends of the IC. The load matching circuits are connected with the crystal oscillators. Each load matching circuit comprises a first capacitor, a second capacitor, an oscillator, a potentiometer, a backward amplifier, a first fixation resistor and a second fixation resistor. Due to the fact that each load matching circuit uses fewer components which comprise the first capacitor, the second capacitor, the oscillator, the potentiometer, the backward amplifier, the first fixation resistor and the second fixation resistor, loss reducing, cost reducing and reliability improving are realized. Frequency reflection is eliminated, and complete matching is realized under the frequency. Corresponding adjustment can be carried out according to the need of a matching network to meet a matching requirement, so that the circuit is adjustable.
Description
Technical field
The utility model relates to different crystal load matching circuit in a kind of crystal oscillator and IC.
Background technology
Along with the needs of the development of IC device and industrial production, scientific research and the modern life, signal or extensive electric energy, in transmitting procedure, for realizing areflexia transmission or the maximum power transfer of signal, require circuit to connect and realize impedance matching circuit.The impedance matching relation the overall performance of system, realizes that coupling can make systematic function reach optimum.The concept of impedance matching has wide range of applications, impedance matching is common between amplifying circuits at different levels, between amplifying circuit and load, between signal and transmission circuit, in the design of microwave circuit and system, no matter be active or passive, all must consider matching problem, basic reason is in low-frequency channel, to be voltage and electric current, and in high frequency, is that guided electromagnetic wave does not mate serious reflection will occur, and damages instrument and equipment.So research crystal load match circuit is necessary.
Summary of the invention
The technical problems to be solved in the utility model is to provide different crystal load matching circuit in a kind of crystal oscillator that improves the crystal oscillator precision and IC.
For addressing the above problem, the utility model adopts following technical scheme: different crystal load matching circuit in a kind of crystal oscillator and IC, comprise crystal oscillator, IC and load matching circuit, described crystal oscillator is arranged on the IC two ends, and described load matching circuit is connected with crystal oscillator; Described load matching circuit comprises the first electric capacity, the second electric capacity, oscillator, potentiometer, amplifierinverter, the first fixed resistance and the second fixed resistance.
As preferably, described the first fixed resistance is connected with the second electric capacity with the first electric capacity, described the second fixed resistance is connected with the second electric capacity, described oscillator is connected with potentiometer, and described amplifierinverter one end connection first is determined resistance together, the other end is connected between the first fixed resistance and the second fixed resistance.
As preferably, described oscillator is set to quartz (controlled) oscillator.
In this practical crystal oscillator and IC, the beneficial effect of different crystal load matching circuit is: the components and parts that adopt due to described load matching circuit are few, only have the first electric capacity, the second electric capacity, oscillator, potentiometer, amplifierinverter, the first fixed resistance and the second fixed resistance, thereby can reduce loss, reduce costs, improve reliability; Eliminate the reflection on frequency, realize coupling fully under this frequency; Can need to make corresponding adjustment according to matching network and reach the coupling requirement, there is modulability.
The accompanying drawing explanation
The schematic diagram that Fig. 1 is different crystal load matching circuit in the utility model crystal oscillator and IC;
Fig. 2 is the schematic diagram of load matching circuit in the different crystal load matching circuit in the utility model crystal oscillator and IC.
Embodiment
Consult shown in Fig. 1 to Fig. 2, different crystal load matching circuit in a kind of crystal oscillator and IC, comprise crystal oscillator, IC (semiconductor device) and load matching circuit, described crystal oscillator is arranged on IC (semiconductor device) two ends, and described load matching circuit is connected with crystal oscillator; Described load matching circuit comprises the first capacitor C g, the second capacitor C d, oscillator 2, potentiometer Rx, amplifierinverter 1, the first fixed resistance Rf and the second fixed resistance Rg.
Described the first fixed resistance is connected with the second capacitor C d with the first capacitor C g, described the second fixed resistance Rg is connected with the second capacitor C d, described oscillator is connected with potentiometer Rx, and described amplifierinverter 1 one ends connect the first fixed resistance Rf, the other end is connected between the first fixed resistance Rf and the second fixed resistance Rg.Described oscillator 2 is set to quartz (controlled) oscillator.
Because the characteristic of crystal oscillator self causes suitable the approaching of distance of these two frequencies, at this in extremely narrow frequency range, crystal oscillator is equivalent to an inductance, so need only electric capacity suitable in the two ends parallel connection of crystal oscillator, it will form antiresonant circuit.This antiresonant circuit is added in a negative-feedback circuit just can form sine wave oscillation circuit, the frequency range that is equivalent to inductance due to crystal oscillator is very narrow, even, so the parameter of other elements alters a great deal, the frequency of this oscillator can not vary widely yet.The load capacitance value, select the shunt capacitance equated with the load capacitance value, just can obtain the resonance frequency of standard.General crystal oscillator oscillating circuit is all at the two ends of inverting amplifier access crystal oscillator, there are again two electric capacity to receive respectively the two ends of crystal oscillator, the other end of each electric capacity is ground connection again, the capability value of these two capacitances in series just should equal load capacitance, and the pin of general IC has equivalent input capacitance.General crystal oscillator load capacitance is 15p, 20pf or 12.5p, and the electric capacity of two 22p can form the oscillating circuit of crystal oscillator.Crystal oscillator is that the components and parts of frequency reference are provided for circuit, usually be divided into two large classes of active crystal oscillator and passive crystal oscillator, passive crystal oscillator needs chip internal that oscillator is arranged, and the signal voltage of crystal oscillator is determined according to start-oscillation circuit, allow different voltage, but the common signal quality of passive crystal oscillator and precision are poor, need the exact matching peripheral circuit, while as need, changing crystal oscillator, to change peripheral circuit simultaneously.Active crystal oscillator does not need the internal oscillator of chip, and high-precision frequency reference can be provided, and signal quality also more passive crystal oscillator will be got well.Passive crystal oscillator need to could produce oscillator signal by means of clock circuit, and self can't vibrate; Active crystal oscillator is a complete resonant oscillator.Quartz oscillator all is to provide a kind of electronic device of stabilizing circuit frequency.Quartz oscillator is to utilize the piezoelectric effect of quartz crystal to carry out starting of oscillation, and quartz-crystal resonator utilizes quartz crystal and built-in IC to come acting in conjunction to carry out work.Oscillator directly applies in circuit, during resonator works, generally need to provide 3.3V voltage to carry out maintenance work.
In the utility model crystal oscillator and IC, the beneficial effect of different crystal load matching circuit is: the components and parts that adopt due to described load matching circuit are few, only have the first electric capacity, the second electric capacity, oscillator, potentiometer, amplifierinverter, the first fixed resistance and the second fixed resistance, thereby can reduce loss, reduce costs, improve reliability; Eliminate the reflection on frequency, realize coupling fully under this frequency; Can need to make corresponding adjustment according to matching network and reach the coupling requirement, there is modulability.
The above, be only embodiment of the present utility model, but protection range of the present utility model is not limited to this, and any variation of expecting without creative work or replacement, within all should being encompassed in protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range that claims were limited.
Claims (3)
1. different crystal load matching circuit in a crystal oscillator and IC, it is characterized in that: comprise crystal oscillator, IC and load matching circuit, described crystal oscillator is arranged on the IC two ends, and described load matching circuit is connected with crystal oscillator; Described load matching circuit comprises the first electric capacity, the second electric capacity, oscillator, potentiometer, amplifierinverter, the first fixed resistance and the second fixed resistance.
2. different crystal load matching circuit in crystal oscillator according to claim 1 and IC, it is characterized in that: described the first fixed resistance is connected with the second electric capacity with the first electric capacity, described the second fixed resistance is connected with the second electric capacity, described oscillator is connected with potentiometer, and described amplifierinverter one end connects the first fixed resistance, the other end is connected between the first fixed resistance and the second fixed resistance.
3. different crystal load matching circuit in crystal oscillator according to claim 1 and IC, it is characterized in that: described oscillator is set to quartz (controlled) oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320378130.XU CN203377840U (en) | 2013-06-27 | 2013-06-27 | Different crystal load matching circuit in crystal oscillator and IC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320378130.XU CN203377840U (en) | 2013-06-27 | 2013-06-27 | Different crystal load matching circuit in crystal oscillator and IC |
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| Publication Number | Publication Date |
|---|---|
| CN203377840U true CN203377840U (en) | 2014-01-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320378130.XU Expired - Fee Related CN203377840U (en) | 2013-06-27 | 2013-06-27 | Different crystal load matching circuit in crystal oscillator and IC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237763A (en) * | 2014-09-09 | 2014-12-24 | 长沙景嘉微电子股份有限公司 | Scheme for designing circuit used for verifying oscillation starting reliability of crystal oscillator |
-
2013
- 2013-06-27 CN CN201320378130.XU patent/CN203377840U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237763A (en) * | 2014-09-09 | 2014-12-24 | 长沙景嘉微电子股份有限公司 | Scheme for designing circuit used for verifying oscillation starting reliability of crystal oscillator |
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| C14 | Grant of patent or utility model | ||
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| CP02 | Change in the address of a patent holder |
Address after: 518108 Guangdong city of Shenzhen province Nanshan District City Pingshan road Xili University Industrial District 5 Building 3 floor Da Yuan Patentee after: SHENZHEN CHUANGCHENG MICROELECTRONICS Co.,Ltd. Address before: Baoan District Shiyan street Shenzhen city Guangdong province 518108 Luo community rent white pine road Taiwan industrial village into a building 1 6A Patentee before: SHENZHEN CHUANGCHENG MICROELECTRONICS Co.,Ltd. |
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| CP02 | Change in the address of a patent holder |
Address after: 518055 2201, 2202, 2203, 2204, 2205, block a, building 8, Shenzhen International Innovation Valley, Dashi 1st Road, Xili community, Nanshan District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN CHUANGCHENG MICROELECTRONICS Co.,Ltd. Address before: 518108 3rd floor, building 5, Dayuan industrial North District, Pingshan 1st Road, Xili University Town, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN CHUANGCHENG MICROELECTRONICS Co.,Ltd. |
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| CP02 | Change in the address of a patent holder | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140101 |
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| CF01 | Termination of patent right due to non-payment of annual fee |