CN103684344B - The transconductance circuit that corner frequency is adjustable - Google Patents
The transconductance circuit that corner frequency is adjustable Download PDFInfo
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- CN103684344B CN103684344B CN201310612382.9A CN201310612382A CN103684344B CN 103684344 B CN103684344 B CN 103684344B CN 201310612382 A CN201310612382 A CN 201310612382A CN 103684344 B CN103684344 B CN 103684344B
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- resistance
- triode
- adjustable
- comparator
- corner frequency
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Abstract
The invention discloses the transconductance circuit that corner frequency is adjustable, comprise resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, electric capacity C1, triode T1 and triode T2, described resistance R2 is connected between the output and ground of resistance R1, and the output of resistance R1 also connects the input in the same way of comparator A; Between the reverse input end that described resistance R3 is connected to comparator A and earth terminal; The output of described comparator A is the basis set of contact resistance R6, triode T1 and electric capacity C1 simultaneously; Described resistance R7 and resistance R8 is sequentially connected in series resistance R6, and resistance R8 one end also connects the collector electrode of comparator T1; The emitter of the basis set connecting triode T1 of described triode T2, the collector electrode of the collector electrode connecting triode T1 of the emitter contact resistance R4 of triode T2 and resistance R5, triode T2.The present invention, by above-mentioned principle, realizes the adjustment to corner frequency, can better realize selective filtering.
Description
Technical field
The present invention relates to filter field, be specifically related to the transconductance circuit that corner frequency is adjustable.
Background technology
China succeeds in developing point-to-multipoint microwave communication system in recent years, and its central station adopts omnidirectional antenna to launch to surrounding, around within 50 kilometers, can have multiple placement subscriber station, separates multiplex telephony be again connected to each user use respectively from subscriber station.The equipment of the capacity that its population size has 100 lines, 500 lines and 1000 lines etc. different, each subscriber station can distribute tens or dozens of telephone subscriber, and the user also extended to outside several hundred kilometers by relay station where necessary uses.This point-to-multipoint microwave communication system for city suburbs, county town to villages and small towns, rural area or offshore islands user, the residential area of dispersion is also extremely share, comparatively economical.Microwave communication is because its bandwidth, capacity are large, may be used for various telecommunication service transmission, as phone, telegram, data, fax and colour TV signal etc. all transmit by microwave circuit.Microwave communication has good performance of combating a natural disaster, and to natural calamity information early warning reports such as floods, disaster caused by a windstorm and earthquakes, microwave communication is generally all unaffected.But microwave is easily disturbed when aerial transmission.Same microwave circuit can not use same frequency in same direction, therefore all need before transmission to carry out filtering to signal transmission.Also not having in existing filter can electric adjustable turn over angular frequency, brings inconvenience to use.
Summary of the invention
Instant invention overcomes the deficiencies in the prior art, provide the transconductance circuit that corner frequency is adjustable, this filter realizes the adjustment to corner frequency, can better realize selective filtering.
For solving above-mentioned technical problem, the present invention is by the following technical solutions: the transconductance circuit that corner frequency is adjustable, comprise resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, electric capacity C1, triode T1 and triode T2, described resistance R2 is connected between the output and ground of resistance R1, and the output of resistance R1 also connects the input in the same way of comparator A; Between the reverse input end that described resistance R3 is connected to comparator A and earth terminal; The output of described comparator A is the basis set of contact resistance R6, triode T1 and electric capacity C1 simultaneously, and electric capacity C1 also connects earth terminal; Described resistance R7 and resistance R8 is sequentially connected in series resistance R6, and resistance R8 one end also connects the collector electrode of comparator T1, and resistance R7 is connected power supply with the common port of resistance R8; The emitter of the basis set connecting triode T1 of described triode T2, the collector electrode of the collector electrode connecting triode T1 of the emitter contact resistance R4 of triode T2 and resistance R5, triode T2; Described resistance R4 is connected between the input of resistance R3 and the input of resistance R5, resistance R5 mono-termination power.
Described resistance R7 is slide rheostat.Realize the adjustment to resistance in circuit, thus change the distribution condition of voltage in circuit, realize, to the adjustment of filtering signal corner frequency, realizing selective filter.
Resistance R7 resistance adjustable range is between 0-50 kilo-ohm.Adjustable range is comparatively large, substantially can meet the requirement of generally filtering signal.
Described triode T1 and triode T2 is NPN type triode.
Described resistance R1 is equal with resistance R4 resistance.
Described resistance R2 is equal with resistance R3 resistance.Realize the object of dividing one part of current of pouring off.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is by arranging slide rheostat in circuit, resistance in circuit can be adjusted, thus the voltage distribution situation in this change circuit, then realize under the acting in conjunction of triode T1 and triode T2 the adjustment of filtering signal corner frequency, realize selective filter.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated, and embodiments of the invention are not limited thereto.
Embodiment:
As shown in fig. 1, the present invention includes resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, electric capacity C1, triode T1 and triode T2, triode T1 and triode T2 is NPN type triode, resistance R1 is equal with resistance R4 resistance, and resistance R2 is equal with resistance R3 resistance.The resistance R2 of the present embodiment is connected between the output and ground of resistance R1, and the output of resistance R1 also connects the input in the same way of comparator A; Between the reverse input end that resistance R3 is connected to comparator A and earth terminal.The output of the comparator A of the present embodiment is the basis set of contact resistance R6, triode T1 and electric capacity C1 simultaneously, and electric capacity C1 also connects earth terminal.Resistance R7 and the resistance R8 of the present embodiment are sequentially connected in series resistance R6, resistance R8 one end also connects the collector electrode of comparator T1, resistance R7 is connected power supply with the common port of resistance R8, and resistance R7 is slide rheostat, and resistance R7 resistance adjustable range is between 0-50 kilo-ohm.The emitter of the basis set connecting triode T1 of the triode T2 of the present embodiment, the collector electrode of the collector electrode connecting triode T1 of the emitter contact resistance R4 of triode T2 and resistance R5, triode T2; Resistance R4 is connected between the input of resistance R3 and the input of resistance R5, resistance R5 mono-termination power.Resistance R1 wherein also connects AC power, and resistance R4 is also connected DC power supply with the common port of resistance R5.
Be provided with slide rheostat R7 in the circuit, resistance can be regulated between 0-50 kilo-ohm, change in circuit the resistance accessing resistance, thus the voltage distribution situation in change circuit, under the acting in conjunction of triode T1 and triode T2, reach and change filtering signal corner frequency, thus better realize selective filter.
Just this invention can be realized as mentioned above.
Claims (5)
1. the transconductance circuit that corner frequency is adjustable, it is characterized in that: comprise resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, resistance R7, resistance R8, electric capacity C1, triode T1 and triode T2, described resistance R2 is connected between the output and ground of resistance R1, and the output of resistance R1 also connects the input in the same way of comparator A; Between the reverse input end that described resistance R3 is connected to comparator A and earth terminal; The output of described comparator A is the basis set of contact resistance R6, triode T1 and electric capacity C1 simultaneously, and electric capacity C1 also connects earth terminal; Described resistance R7 and resistance R8 is sequentially connected in series resistance R6, and resistance R8 one end also connects the collector electrode of comparator T1, and resistance R7 is connected power supply with the common port of resistance R8; The emitter of the basis set connecting triode T1 of described triode T2, the collector electrode of the collector electrode connecting triode T1 of the emitter contact resistance R4 of triode T2 and resistance R5, triode T2; Described resistance R4 is connected between the input of resistance R3 and the input of resistance R5, resistance R5 mono-termination power; Described resistance R7 is slide rheostat.
2. the transconductance circuit that corner frequency according to claim 1 is adjustable, is characterized in that: resistance R7 resistance adjustable range is between 0-50 kilo-ohm.
3. the transconductance circuit that corner frequency according to claim 1 is adjustable, is characterized in that: described triode T1 and triode T2 is NPN type triode.
4. the transconductance circuit that corner frequency according to claim 1 is adjustable, is characterized in that: described resistance R1 is equal with resistance R4 resistance.
5. the transconductance circuit that corner frequency according to claim 1 is adjustable, is characterized in that: described resistance R2 is equal with resistance R3 resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310612382.9A CN103684344B (en) | 2013-11-28 | 2013-11-28 | The transconductance circuit that corner frequency is adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310612382.9A CN103684344B (en) | 2013-11-28 | 2013-11-28 | The transconductance circuit that corner frequency is adjustable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103684344A CN103684344A (en) | 2014-03-26 |
| CN103684344B true CN103684344B (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310612382.9A Expired - Fee Related CN103684344B (en) | 2013-11-28 | 2013-11-28 | The transconductance circuit that corner frequency is adjustable |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106326954A (en) * | 2016-08-31 | 2017-01-11 | 四川金投金融电子服务股份有限公司 | Precious metal in-out stock high-precision object confirmation system |
| CN106384407A (en) * | 2016-08-31 | 2017-02-08 | 四川金投金融电子服务股份有限公司 | Precious metal storehouse access personnel identity high-precision confirmation system |
| CN106372691A (en) * | 2016-08-31 | 2017-02-01 | 四川金投金融电子服务股份有限公司 | High-speed information check system based on bank money box transfer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155186A (en) * | 1995-09-29 | 1997-07-23 | 哈里公司 | Sampling data bias for continuous time integral circuit |
| EP0818884A2 (en) * | 1996-07-12 | 1998-01-14 | Samsung Electronics Co., Ltd. | Apparatus for stabilizing cut-off frequency using a transconductance |
| CN200953544Y (en) * | 2006-08-24 | 2007-09-26 | 康佳集团股份有限公司 | Low pass filter circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3149528B2 (en) * | 1992-04-28 | 2001-03-26 | オンキヨー株式会社 | filter |
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2013
- 2013-11-28 CN CN201310612382.9A patent/CN103684344B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1155186A (en) * | 1995-09-29 | 1997-07-23 | 哈里公司 | Sampling data bias for continuous time integral circuit |
| EP0818884A2 (en) * | 1996-07-12 | 1998-01-14 | Samsung Electronics Co., Ltd. | Apparatus for stabilizing cut-off frequency using a transconductance |
| CN200953544Y (en) * | 2006-08-24 | 2007-09-26 | 康佳集团股份有限公司 | Low pass filter circuit |
Non-Patent Citations (1)
| Title |
|---|
| 一种开关R-MOSFET-C滤波芯片的设计;徐以军;《中国优秀硕士学位论文全文数据库》;20130515;全文 * |
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| CN103684344A (en) | 2014-03-26 |
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Granted publication date: 20160420 Termination date: 20181128 |