CN102055431A - Special type quartz crystal filter with very low frequency (VLF) and small volume and implementation method thereof - Google Patents
Special type quartz crystal filter with very low frequency (VLF) and small volume and implementation method thereof Download PDFInfo
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- CN102055431A CN102055431A CN2010105466457A CN201010546645A CN102055431A CN 102055431 A CN102055431 A CN 102055431A CN 2010105466457 A CN2010105466457 A CN 2010105466457A CN 201010546645 A CN201010546645 A CN 201010546645A CN 102055431 A CN102055431 A CN 102055431A
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Abstract
The invention discloses a special type quartz crystal filter with very low frequency (VLF) and small volume and an implementation method thereof. The quartz crystal filter comprises a first resistor, a second resistor, a first capacitor, a second capacitor, an inductor, a first quartz crystal resonator, a second quartz crystal resonator, a third quartz crystal resonator and a fourth quartz crystal resonator, wherein the first, second, third and fourth quartz crystal resonators are in an XY' thickness bending oscillation mode respectively. The quartz crystal resonators in the invention replace original mechanical filters in an airborne communicator, and adopt the XY' thickness bending oscillation mode; and a filter circuit is a two-section crystal narrow-band differential bridge type circuit. The quartz crystal resonators and the filter circuit are packaged by using a primary packaging technology of cold welding; and compared with the traditional secondary packaging technology, the packaging volume is less. The designs of the filter circuit and the quartz crystal resonators can ensure all performance indexes of the filter, so that the quartz crystal filter can work in the VLF range of 10kHz to 15kHz.
Description
Technical field
The present invention relates to filter, relate in particular to the extraordinary quartz-crystal filter of a kind of 10KHz～15KHz very low frequency small size and its implementation.
Background technology
The resonance frequency of quartz crystal components and parts and the wafer volume relation of being inversely proportional to, be that frequency is low more, volume is big more, this is its distinguishing feature, especially the quartz-crystal resonator of 10KHz～15KHz have that volume is big, expense raw material, difficult processing, flaw that rate of finished products is low, so quartz crystal components and parts manufacturing firm is not listed this series products in the product sample in both at home and abroad.
In the prior art, domestic quartz-crystal filter low-limit frequency 100KHz, product design size 83 * 63 * 26mm3, Japan quartz-crystal filter low-limit frequency 455KHz, overall dimension 64 * 25 * 22mm3, and the extraordinary quartz-crystal filter key of 10KHz～15KHz very low frequency small size is the influence that is subjected to quartz-crystal resonator overall dimension, so offshore company has adopted mechanical filter in order to realize the little specific (special) requirements of machine volume, and there is the obvious inferior position that frequency-temperature coefficient is big, quality factor are low in mechanical filter.
Summary of the invention
The invention provides the extraordinary quartz-crystal filter of a kind of very low frequency small size and its implementation, the resonance frequency of quartz-crystal filter can be operated in the very low frequency scope, and volume ratio is less.
Technical scheme of the present invention is:
The extraordinary quartz-crystal filter of a kind of very low frequency small size comprises: adopt the filter circuit of two joint crystal arrowband differential bridge types and first quartz-crystal resonator, second quartz-crystal resonator, the 3rd quartz-crystal resonator and the 4th quartz-crystal resonator of employing XY` thickness flexure oscillation mode; Described filter circuit comprises first resistance, second resistance, first electric capacity, second electric capacity, inductance;
One end of first resistance is connected with an end of inductance, an end of first electric capacity, an end of first quartz-crystal resonator respectively, and the other end of the other end of first resistance, first electric capacity, the other end of inductance be ground connection respectively; One end ground connection of second quartz-crystal resonator, the other end is connected with the other end of first quartz-crystal resonator, an end of the 3rd quartz-crystal resonator, an end of the 4th quartz-crystal resonator respectively, the other end of the 3rd quartz-crystal resonator is connected the other end ground connection of the other end of second electric capacity and second resistance with the other end of the 4th quartz-crystal resonator, an end of second electric capacity and an end of second resistance respectively.
The implementation method of quartz-crystal filter recited above comprises:
Select four filter circuits that adopt the quartz-crystal resonator of XY` thickness flexure oscillation mode and adopt two joint crystal arrowband differential bridge types;
Operating frequency, frequency-temperature characteristic and equivalent parameters according to quartz-crystal resonator are determined cut type;
According to quartz-crystal resonator to frequently float, the requirement of frequency-temperature characteristic chooses corner cut and definite error precision;
Design electric field electrode shape, supporting structure and encapsulation shape according to XY` thickness flexure oscillation mode and cut type;
Adopt encapsulation technology of cold welding that quartz-crystal resonator and filter circuit are encapsulated according to the electric field electrode shape of designing, supporting structure and encapsulation shape.
Quartz-crystal resonator of the present invention adopts XY` thickness flexure oscillation mode, filter circuit is two joint crystal arrowband differential bridge type circuit, and quartz-crystal resonator and filter circuit adopt encapsulation technology of cold welding to encapsulate, and it is very little to encapsulate volume with respect to traditional secondary encapsulation technology; And every performance index of filter have been guaranteed in the design alternative of filter circuit and quartz-crystal resonator, make quartz-crystal filter of the present invention can be operated in very low frequency scope (10KHz～15KHz).
Description of drawings
Fig. 1 is the cutting orientation diagram of the XY` thickness flexure vibration of quartz-crystal resonator of the present invention;
Fig. 2 is full pole lowpass LC ladder type filter circuit;
Fig. 3 is a quartz-crystal filter of the present invention.
Embodiment
Below in conjunction with accompanying drawing specific embodiments of the invention are done a detailed elaboration.
The extraordinary quartz-crystal filter of very low frequency small size of the present invention, can substitute the mechanical filter in the airborne communicator, as Fig. 3, this quartz-crystal filter comprises: adopt the filter circuit of two joint crystal arrowband differential bridge types and the first quartz-crystal resonator fs1, the second quartz-crystal resonator fs2, the 3rd quartz-crystal resonator fs3 and the 4th quartz-crystal resonator fs4 of employing XY` thickness flexure oscillation mode; Described filter circuit comprises first resistance R 1, second resistance R 2, first capacitor C 1, second capacitor C 2, inductance L; Wherein, the first quartz-crystal resonator fs1, the second quartz-crystal resonator fs2, the 3rd quartz-crystal resonator fs3 and the 4th quartz-crystal resonator fs4 and filter circuit adopt encapsulation technology of cold welding to encapsulate;
One end of first resistance R 1 is connected with an end of inductance L, an end of first capacitor C 1, the end of the first quartz-crystal resonator fs1 respectively, and the other end of the other end of first resistance R 1, first capacitor C 1, the other end of inductance L be ground connection respectively; The end ground connection of the second quartz-crystal resonator fs2, the other end is connected with the other end of the first quartz-crystal resonator fs1, the end of the 3rd quartz-crystal resonator fs3, the end of the 4th quartz-crystal resonator fs4 respectively, the other end of the 3rd quartz-crystal resonator fs3 is connected the other end ground connection of the other end of second capacitor C 2 and second resistance R 2 with the other end of the 4th quartz-crystal resonator fs4, an end of second capacitor C 2 and an end of second resistance R 2 respectively.
Quartz-crystal resonator of the present invention adopts XY` thickness flexure oscillation mode, filter circuit is two joint crystal arrowband differential bridge type circuit, and quartz-crystal resonator and filter circuit adopt encapsulation technology of cold welding to encapsulate, and it is very little to encapsulate volume with respect to traditional secondary encapsulation technology; And every performance index of filter have been guaranteed in the design alternative of filter circuit and quartz-crystal resonator, make quartz-crystal filter of the present invention can be operated in the very low frequency scope, frequency range is 10KHz～15KHz, and the size of the volume of quartz-crystal filter can be accomplished 40 * 28 * 12mm3.
The cutting orientation of XY` thickness flexure oscillation mode as shown in Figure 1, corner cut be 5 the degree; XY` thickness flexure oscillation mode in the ordinary course of things, the more complicated that concerns of frequency constant and incisal angle edge ratio has only the limit when very little, their relation is just fairly simple.
The centre frequency of quartz-crystal resonator of the present invention can be designed as centre frequency 10KHz～15KHz, wafer profile size smaller or equal to 34.6 * 2.3 * 4.0 (length * wide * height, unit is respectively mm), filter circuit is to calculate and design according to filter indexs such as passband, stopband, squareness factor, Insertion Loss.
Wherein, the circuit design method of filter circuit be performance requirement such as the passband, stopband, squareness factor, Insertion Loss according to filter by calculating, table look-up and testing, find out a normalized relatively low pass LC ladder type circuit, its circuit diagram as shown in Figure 2.Afterwards, be converted to as shown in Figure 3 filter circuit of the present invention according to this low pass LC ladder type circuit again.
The design of quartz-crystal resonator and manufacturing are according to being:
1, select XY` thickness flexure oscillation mode, cut type will wait according to operating frequency, frequency-temperature characteristic and the equivalent parameters of quartz-crystal resonator to determine;
2, according to quartz-crystal resonator corner cut and definite error precision are selected in the requirement of floating (frequency drift), frequency-temperature characteristic frequently;
3, after definite cut type, corner cut, the geometry of quartz-crystal resonator and the selection of profile are also very important, and it can determine the index such as frequency stability characteristics, equivalent parameters of components and parts;
4, design electric field electrode shape, supporting structure and encapsulation shape according to XY` thickness flexure oscillation mode and cut type.
The implementation method of aforesaid quartz-crystal filter of the present invention comprises:
Select four filter circuits that adopt the quartz-crystal resonator of XY` thickness flexure oscillation mode and adopt two joint crystal arrowband differential bridge types;
Operating frequency, frequency-temperature characteristic and equivalent parameters according to quartz-crystal resonator are determined cut type;
According to quartz-crystal resonator to frequently float, the requirement of frequency-temperature characteristic chooses corner cut and definite error precision;
Design electric field electrode shape, supporting structure and encapsulation shape according to XY` thickness flexure oscillation mode and cut type;
Adopt encapsulation technology of cold welding that quartz-crystal resonator and filter circuit are encapsulated according to the electric field electrode shape of designing, supporting structure and encapsulation shape.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (2)
1. the extraordinary quartz-crystal filter of a very low frequency small size, it is characterized in that, comprising: adopt the filter circuit of two joint crystal arrowband differential bridge types and first quartz-crystal resonator, second quartz-crystal resonator, the 3rd quartz-crystal resonator and the 4th quartz-crystal resonator of employing XY` thickness flexure oscillation mode; Described filter circuit comprises first resistance, second resistance, first electric capacity, second electric capacity, inductance;
One end of first resistance is connected with an end of inductance, an end of first electric capacity, an end of first quartz-crystal resonator respectively, and the other end of the other end of first resistance, first electric capacity, the other end of inductance be ground connection respectively; One end ground connection of second quartz-crystal resonator, the other end is connected with the other end of first quartz-crystal resonator, an end of the 3rd quartz-crystal resonator, an end of the 4th quartz-crystal resonator respectively, the other end of the 3rd quartz-crystal resonator is connected the other end ground connection of the other end of second electric capacity and second resistance with the other end of the 4th quartz-crystal resonator, an end of second electric capacity and an end of second resistance respectively.
2. the implementation method of quartz-crystal filter according to claim 1 is characterized in that, comprising:
Select four filter circuits that adopt the quartz-crystal resonator of XY` thickness flexure oscillation mode and adopt two joint crystal arrowband differential bridge types;
Operating frequency, frequency-temperature characteristic and equivalent parameters according to quartz-crystal resonator are determined cut type;
According to quartz-crystal resonator to frequently float, the requirement of frequency-temperature characteristic chooses corner cut and definite error precision;
Design electric field electrode shape, supporting structure and encapsulation shape according to XY` thickness flexure oscillation mode and cut type;
Adopt encapsulation technology of cold welding that quartz-crystal resonator and filter circuit are encapsulated according to the electric field electrode shape of designing, supporting structure and encapsulation shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105466457A CN102055431A (en) | 2010-11-16 | 2010-11-16 | Special type quartz crystal filter with very low frequency (VLF) and small volume and implementation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105466457A CN102055431A (en) | 2010-11-16 | 2010-11-16 | Special type quartz crystal filter with very low frequency (VLF) and small volume and implementation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116582102A (en) * | 2023-07-13 | 2023-08-11 | 东晶电子金华有限公司 | Method for improving packaging technology of quartz crystal resonator |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005034349A1 (en) * | 2003-10-06 | 2005-04-14 | Philips Intellectual Property & Standards Gmbh | Ladder-type thin-film bulk acoustic wave filter |
| CN2711988Y (en) * | 2004-06-09 | 2005-07-20 | 上海美多通信设备有限公司 | Double-way crystal filter |
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- 2010-11-16 CN CN2010105466457A patent/CN102055431A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005034349A1 (en) * | 2003-10-06 | 2005-04-14 | Philips Intellectual Property & Standards Gmbh | Ladder-type thin-film bulk acoustic wave filter |
| CN1864328A (en) * | 2003-10-06 | 2006-11-15 | 皇家飞利浦电子股份有限公司 | Ladder-type thin-film bulk acoustic wave filter |
| CN2711988Y (en) * | 2004-06-09 | 2005-07-20 | 上海美多通信设备有限公司 | Double-way crystal filter |
Non-Patent Citations (2)
| Title |
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| 靳宝安等: "21.4MHz宽带分立式压电石英晶体滤波器研制", 《人工晶体学报》 * |
| 靳宝安等: "LST-92kHz型低频窄带石英晶体滤波器研制", 《人工晶体学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116582102A (en) * | 2023-07-13 | 2023-08-11 | 东晶电子金华有限公司 | Method for improving packaging technology of quartz crystal resonator |
| CN116582102B (en) * | 2023-07-13 | 2023-09-29 | 东晶电子金华有限公司 | Method for improving packaging technology of quartz crystal resonator |
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Application publication date: 20110511 |