CN100478705C - Signal magnifying multiple circuit with digital control - Google Patents
Signal magnifying multiple circuit with digital control Download PDFInfo
- Publication number
- CN100478705C CN100478705C CNB2006100312973A CN200610031297A CN100478705C CN 100478705 C CN100478705 C CN 100478705C CN B2006100312973 A CNB2006100312973 A CN B2006100312973A CN 200610031297 A CN200610031297 A CN 200610031297A CN 100478705 C CN100478705 C CN 100478705C
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- China
- Prior art keywords
- circuit
- digital control
- debouncing
- switch
- electrostatic prevention
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Abstract
A control circuit of signal amplification times consists of key switch, static electricity proof and jitter removal circuit, state generation circuit of cyclic control and switch circuit .It features that above said units are connected in sequence, digital circuit is operated only when key is pressed down and it does not work at the other time for effectively avoiding interference of digital circuit to analog circuit.
Description
Technical field
The present invention relates to a kind of signal magnifying multiple circuit with digital control, relate in particular to a kind of signal magnifying multiple circuit with digital control that can be used in the electrical measuring instrument, based on state machine.
Background technology
At present, in circuit, carry out gain control, generally realize with single-chip microcomputer or other micro controller, these devices all are digit chips, and circuit needs continuous service, perhaps use multi-gear switch and oscillator generation periodic signal and control, the analog amplify circuit in the circuit is easy to produce disturbs; In addition, when button because shake and electrostatic influence can make the button operation instability.
Summary of the invention
The objective of the invention is to overcome above-mentioned weak point of the prior art, provide a kind of noiseless, the enlargement factor control circuit that button operation is stable circuit internal simulation circuit.
The objective of the invention is to be achieved through the following technical solutions: it comprises keyswitch, the electrostatic prevention debouncing circuit, and the cycle control state produces circuit and on-off circuit; Described keyswitch, the electrostatic prevention debouncing circuit, the cycle control state produces circuit and on-off circuit connects in turn.
Described electrostatic prevention debouncing circuit both can be an integrated circuit, also can be the circuit that discrete component is formed.
The present invention is because only when button is pressed, digital circuit is just worked, i.e. state exchange, do not work At All Other Times, thereby the interference of effectively having avoided digital circuit to produce to mimic channel, and prevented the effect of jitter that switch is pressed, the electrostatic influence of human body etc. has also been avoided effectively.
Description of drawings
Fig. 1 is a structured flowchart of the present invention;
Fig. 2 is the circuit diagram of one embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
With reference to accompanying drawing 1,2, present embodiment comprises keyswitch 1, electrostatic prevention debouncing circuit 2, and the cycle control state produces circuit 3 and on-off circuit 4; Described keyswitch 1, electrostatic prevention debouncing circuit 2, the cycle control state produces circuit 3 and on-off circuit 4 connects in turn; Electrostatic prevention debouncing circuit 2 comprises that switch removes to tremble chip U
1, U
1Adopt chip MAX6818, the input end IN of chip MAX6818
1Pass through resistance R
1Ground connection, other input ends pass through resistance eutral grounding equally; Simultaneously, input end IN
1With keyswitch S
1Connect keyswitch S
1The other end and power supply V
CCConnect; The cycle control state produces circuit 3 and comprises counting/pulse distribution chip U
2And by resistance R
3, capacitor C
61The electrify restoration circuit of forming, counting/pulse distribution chip U
2Adopt chip CD4017, form the cycle control state and produce circuit 3, chip MAX6818 output terminal OUT
1 Connect input end 14 pin that the cycle control state produces the CD4017 in the circuit 3, counting/pulsqe distributor U
213 pin ground connection, resistance R
3, capacitor C
61Form electrify restoration circuit, time constant is about 0.01s; Described on-off circuit 4 comprises switch chip U
3, switch chip U
3Adopt chip MAX313, described cycle control state produces the output terminal 3 of the chip CD4017 of circuit 3,2,4,7 pin connect input end 3,14,11,6 pin of switch chip MAX313 respectively, and (3 pin of the U2 that only draws in the accompanying drawing 2 and 3 pin of U3 are connected, all the other are not drawn), the input of every road is by a resistance eutral grounding, the input end IN of switch chip MAX313
1Connect gain control resistance.
Present embodiment is provided with 12 keyswitches 1, adopt touch switch, divide third gear, every grade of 4 grades of selections, switch one termination+5V high level, three input ends of every grade control termination MAX6818, only select 8 input pins wherein 3, switch goes to connect cycle control state generation circuit 3 after the shake, adopts rising edge to trigger, and the pin 10 of CD4017 is by diode D
4Connect 15 pin, which mode bit 15 connect is determined that by the shelves number of selecting present embodiment has 4 grades for every grade, and 15 pin connect mode bit 5, i.e. 10 pin.Present embodiment cycle control state produces circuit 3 to be made up of 3 CD4017, controls 3 grades of amplifications, its electrification reset resistance R
3Get 100k, capacitor C
61Get 0.47uF, time constant is about 0.01s.Select to receive analog switching circuit 4 after the control output, adopt 3 low on-resistance switch chip MAX313, its per 4 control input ends connect CD4017 one of four states output terminal.
When working on power, gain is selected to produce circuit 3 by the cycle control state and is chosen as 0dB, when some buttons are pressed, a high level pulse is exported after by MAX6818, because 14 pin of CD4017 are by a resistance eutral grounding at ordinary times, after coming, this high level pulse just make it that rising edge has been arranged from low to high, the status circuit that triggers CD4017 is transformed into next state, this state is that high level is represented, this high level is controlled at the control end that outputs to on-off circuit 4 corresponding passage is opened.When pressing, the course of work was carried out once up to 4 states entirely to above-mentioned similar, just finished a circulation, entered next circulation again.
The utility model is controlled by state machine circuit, and digital circuit does not produce sequential at ordinary times, only produces when button is pressed, avoided the interference of digital circuit like this to mimic channel, in addition, adopted in the circuit and removed shake and electrostatic prevention circuit, prevented the instability when button is pressed.
Claims (3)
1, a kind of signal magnifying multiple circuit with digital control is characterized in that, comprises keyswitch, the electrostatic prevention debouncing circuit, and the cycle control state produces circuit and on-off circuit; Described keyswitch, the electrostatic prevention debouncing circuit, the cycle control state produces circuit and on-off circuit connects in turn.
2, signal magnifying multiple circuit with digital control according to claim 1 is characterized in that, described electrostatic prevention debouncing circuit is an integrated circuit.
3, signal magnifying multiple circuit with digital control according to claim 1 is characterized in that, described electrostatic prevention debouncing circuit is the circuit that discrete component is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100312973A CN100478705C (en) | 2006-03-06 | 2006-03-06 | Signal magnifying multiple circuit with digital control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100312973A CN100478705C (en) | 2006-03-06 | 2006-03-06 | Signal magnifying multiple circuit with digital control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1818715A CN1818715A (en) | 2006-08-16 |
| CN100478705C true CN100478705C (en) | 2009-04-15 |
Family
ID=36918802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100312973A Expired - Fee Related CN100478705C (en) | 2006-03-06 | 2006-03-06 | Signal magnifying multiple circuit with digital control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100478705C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100495075C (en) * | 2006-10-24 | 2009-06-03 | 中南大学 | Method for setting amplifying times of electrical exploration signal receiver of artificial field source |
| CN103677282B (en) * | 2012-09-24 | 2016-08-31 | 中国航天科工集团第二研究院二O七所 | A kind of software implementation method removing key shake based on storehouse |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU486295A1 (en) * | 1970-09-23 | 1975-09-30 | Московский Ордена Трудового Красного Знамени Геологоразведочный Институт Им.С.Орджоникидзе | Geoelectromagnetic device |
| US5347222A (en) * | 1993-01-11 | 1994-09-13 | Kabushiki Kaisha Toshiba | Signal/noise ratio optimization tuning system |
| CN1034276C (en) * | 1991-11-20 | 1997-03-19 | 中国石化金陵石化公司烷基苯厂 | Solid acid catalyst for olefine hydrocarbons and phenyl alkylate |
| US5828216A (en) * | 1996-08-19 | 1998-10-27 | The United States Of America As Represented By The Department Of Health And Human Services | Gated RF preamplifier for use in pulsed radiofrequency electron paramagnetic resonance and MRI |
-
2006
- 2006-03-06 CN CNB2006100312973A patent/CN100478705C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU486295A1 (en) * | 1970-09-23 | 1975-09-30 | Московский Ордена Трудового Красного Знамени Геологоразведочный Институт Им.С.Орджоникидзе | Geoelectromagnetic device |
| CN1034276C (en) * | 1991-11-20 | 1997-03-19 | 中国石化金陵石化公司烷基苯厂 | Solid acid catalyst for olefine hydrocarbons and phenyl alkylate |
| US5347222A (en) * | 1993-01-11 | 1994-09-13 | Kabushiki Kaisha Toshiba | Signal/noise ratio optimization tuning system |
| US5828216A (en) * | 1996-08-19 | 1998-10-27 | The United States Of America As Represented By The Department Of Health And Human Services | Gated RF preamplifier for use in pulsed radiofrequency electron paramagnetic resonance and MRI |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1818715A (en) | 2006-08-16 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090415 Termination date: 20160306 |