CN103825552A - Crystal-oscillator circuit shared by multiple chips - Google Patents
Crystal-oscillator circuit shared by multiple chips Download PDFInfo
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- CN103825552A CN103825552A CN201210467273.8A CN201210467273A CN103825552A CN 103825552 A CN103825552 A CN 103825552A CN 201210467273 A CN201210467273 A CN 201210467273A CN 103825552 A CN103825552 A CN 103825552A
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Abstract
The invention provides a crystal-oscillator circuit shared by multiple chips. The crystal-oscillator circuit shared by the multiple chips is capable of only using one or a few crystal-oscillator circuits to provide crystal-oscillator signals to the multiple chips. The crystal-oscillator circuit shared by the multiple chips includes a crystal oscillator which includes a first end connected to a grounding end through a first capacitor and also includes a second end connected to the grounding end through a second capacitor. The first end is connected to a crystal-oscillator signal input end of a first chip and the second end is connected to a crystal-oscillator signal output end of the first chip. The second end is also connected to a crystal-oscillator signal input end of a second chip.
Description
Technical field
The invention belongs to technical field of integrated circuits, be specifically related to a kind of multi-chip common crystal oscillating circuit.
Background technology
In some Circuits System, because function need to tend to use 2 or above same integrated circuit, and these integrated antenna packages are in multiple chips, some chips need external crystal-controlled oscillation and external capacitive, such as, in certain 4 road electric energy acquisition system, need to use the same collection special chip in 4 tunnels, each integrated circuit configures crystal oscillator and electric capacity if, need 4 crystal oscillators and 8 electric capacity, so not only can increase cost but also owing to being separate between each crystal oscillator, so certainly exist time/difference of injection time.And more components and parts have also affected the layout in Circuits System, limit arrangement space.So industry needs a kind of circuit of optimization to provide synchronous crystal oscillator for multiple integrated circuit (IC) chip.
Summary of the invention
Summary of the invention of the present invention only provides a basic comprehension to part of the present invention aspect and feature, and it is not to general introduction widely of the present invention, neither be used for particularly pointing out the key element of key of the present invention or delineate scope of invention.Its unique object is to present simplifiedly concepts more of the present invention.
The invention provides a kind of multi-chip common crystal oscillating circuit and can be only provide crystal oscillator signal with one or a few crystal oscillating circuit for polylith chip.Crystal oscillating circuit of the present invention comprises: a crystal oscillator, described crystal oscillator comprises that first end is connected to earth terminal by the first electric capacity, also comprise that second end is connected to earth terminal by the second electric capacity, described first end is connected to the crystal oscillator signal input part of the first chip, the second end is connected to the crystal oscillator signal output part of the first chip, it is characterized in that: described the second end is also connected to the crystal oscillator signal input part of the second chip.The crystal oscillator signal output part of described the second chip can be unsettled.Described the first and second chips have common earth terminal.
The second end of wherein said crystal oscillator is also connected to other chip, and comprises a signal amplification circuit between the crystal oscillator signal of described the second end and other chip input section.Signal amplification circuit comprises a MOS switch, and the gate pole of MOS switch is connected to the second end of described crystal oscillator.
Adopt the circuit of the present invention not only can be cost-saving and guaranteed that between polylith chip, signal is synchronous, be also conducive to save the space of arranging in circuit design.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become: following accompanying drawing has formed the part of this specification, enumerate different embodiment together with specification, to explain and to illustrate aim of the present invention.The following drawings is not depicted all technical characterictics of specific embodiment, does not depict actual size and the true ratio of parts yet.
Fig. 1 has shown the circuit structure of first embodiment of the invention.
Fig. 2 has shown the circuit structure of second embodiment of the invention.
Embodiment
The object of this invention is to provide a kind of circuit that crystal oscillator signal can be provided for multiple chips.As shown in Figure 1, circuit of the present invention comprises an external crystal oscillator X1, and the two ends of crystal oscillator X1 are connected to earth terminal by the first capacitor C 1 and the second capacitor C 2 respectively.The first end of crystal oscillator X1 is electrically connected to the crystal oscillator signal input part of the first chip CH1, and the second end of crystal oscillator X1 is connected to the crystal oscillator signal output part of the first chip.The second end of crystal oscillator signal is connected to the crystal oscillator signal input part of other a few chip block CH2-CH4 simultaneously.The output of other a few chip block CH2-CH4 is unsettled.Lower of such circuit structure with a crystal oscillator just can be embodied as CH1-4 or more polylith chip crystal oscillator signal is provided, so and owing to having shared a crystal oscillator and guaranteed the synchronism of signal between polylith chip.Polylith chip is as shown in Figure 1 as for electric energy acquisition system, under this occasion, in fact between these integrated circuits, do not need isolation, what need isolation is only partly to input or output signal demand to isolate, and integrated circuit power supply and crystal oscillator signal are not need isolation.So as long as need the signal of isolation to isolate part, and be common ground between multiple chip, these chips can be suitable for a crystal oscillating circuit of the present invention crystal oscillator signal is provided.
In the time providing crystal oscillator signal by a crystal oscillating circuit to polylith chip, owing to driving signal problem, may cause driving force deficiency.While being greater than to a certain degree such as the chip of suppling signal, will there is this phenomenon.Second embodiment of the invention result has as shown in Figure 2 solved this problem, crystal oscillating circuit to before chip CH2-CHn power supply through a follow circuit.Described signal amplification circuit comprises a MOS switch S 1, and the first end of S1 is connected to the power supply VCC of integrated circuit, and the second end is connected to an earth terminal by a resistance R 2.The crystal oscillator signal of described crystal oscillator X1 is connected to the gate pole of MOS switch.Output signal after the second end amplifies as electric current is connected to the crystal oscillator signal input part of other CH2-CHn.As long as crystal oscillator signal is still greater than the gate pole cut-in voltage of S1 switch just can be amplified by invention circuit, can there is not the hypodynamic problem that drives like this.
Multiple chip CH1-CHn in the present invention, except being same model as described in embodiment mono-and two, can be also different models, just can adopt shared crystal oscillating circuit of the present invention as long as can share a crystal oscillator signal between these chips.Adopt the circuit of the present invention not only can be cost-saving and guaranteed that between polylith chip, signal is synchronous, be also conducive to save the space of arranging in circuit design.
Term and expression way used in this specification embodiment are for describing invention rather than restriction, should not getting rid of any equivalent or refill so these are expressed.In addition, those skilled in the art, by the understanding to specification of the present invention with to practice of the present invention, can easily expect other implementation.In multiple embodiment described herein, various aspects and/or parts can be adopted separately or be combined employing.It is emphasized that specification and embodiment only as an example, the scope of reality of the present invention and thinking define by claim below.
Claims (7)
1. a multi-chip common crystal oscillating circuit, is characterized in that: described circuit comprises:
A crystal oscillator comprises, described crystal oscillator comprises that first end is connected to earth terminal by the first electric capacity, also comprise that second end is connected to earth terminal by the second electric capacity, described first end is connected to the crystal oscillator signal input part of the first chip, the second end is connected to the crystal oscillator signal output part of the first chip, it is characterized in that: described the second end is also connected to the crystal oscillator signal input part of the second chip.
2. multi-chip common crystal oscillating circuit according to claim 1, is characterized in that: described the second end is also connected to other at least 4 chips, and comprises a signal amplification circuit between the crystal oscillator signal input part of described the second end and other at least 4 chips.
3. multi-chip common crystal oscillating circuit according to claim 2, is characterized in that: described signal amplification circuit comprises a MOS switch, and the gate pole end of described MOS switch is connected to the second end of described crystal oscillator.
4. multi-chip common crystal oscillating circuit according to claim 1, is characterized in that: the crystal oscillator signal output part of described the second chip is unsettled.
5. multi-chip common crystal oscillating circuit according to claim 1, is characterized in that: described the first and second chips have common earth terminal.
6. multi-chip common crystal oscillating circuit according to claim 3, is characterized in that: the first end that also comprises of described MOS switch is connected to a stabilized voltage power supply, and the second end is by a grounding through resistance.
7. multi-chip common crystal oscillating circuit according to claim 6, is characterized in that: the second end of described MOS switch is connected to the crystal oscillator signal input part of described other chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210467273.8A CN103825552A (en) | 2012-11-19 | 2012-11-19 | Crystal-oscillator circuit shared by multiple chips |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210467273.8A CN103825552A (en) | 2012-11-19 | 2012-11-19 | Crystal-oscillator circuit shared by multiple chips |
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| CN103825552A true CN103825552A (en) | 2014-05-28 |
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| CN201210467273.8A Pending CN103825552A (en) | 2012-11-19 | 2012-11-19 | Crystal-oscillator circuit shared by multiple chips |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992766A (en) * | 2017-03-13 | 2017-07-28 | 建荣半导体（深圳）有限公司 | A kind of crystal oscillator start-oscillation circuit, nude film and chip |
| CN108919242A (en) * | 2018-06-13 | 2018-11-30 | 四川合众精准科技有限公司 | A kind of precise distance measurement system of the UWB module of shared crystal oscillator |
| CN109634886A (en) * | 2018-11-09 | 2019-04-16 | 天津航空机电有限公司 | A kind of multi-serial ports communication crystal oscillating circuit |
| CN111030677A (en) * | 2019-12-23 | 2020-04-17 | 康佳集团股份有限公司 | Multiplexing processing circuit, crystal oscillator multiplexing circuit and television |
| WO2021008363A1 (en) * | 2019-07-12 | 2021-01-21 | 晶晨半导体(上海)股份有限公司 | Passive crystal oscillator sharing circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106992766A (en) * | 2017-03-13 | 2017-07-28 | 建荣半导体（深圳）有限公司 | A kind of crystal oscillator start-oscillation circuit, nude film and chip |
| CN108919242A (en) * | 2018-06-13 | 2018-11-30 | 四川合众精准科技有限公司 | A kind of precise distance measurement system of the UWB module of shared crystal oscillator |
| CN109634886A (en) * | 2018-11-09 | 2019-04-16 | 天津航空机电有限公司 | A kind of multi-serial ports communication crystal oscillating circuit |
| WO2021008363A1 (en) * | 2019-07-12 | 2021-01-21 | 晶晨半导体(上海)股份有限公司 | Passive crystal oscillator sharing circuit |
| CN111030677A (en) * | 2019-12-23 | 2020-04-17 | 康佳集团股份有限公司 | Multiplexing processing circuit, crystal oscillator multiplexing circuit and television |
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Application publication date: 20140528 |