CN102684657A - Method for switching negative pressure signal by using ordinary analogue switch - Google Patents
Method for switching negative pressure signal by using ordinary analogue switch Download PDFInfo
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- CN102684657A CN102684657A CN2011100592867A CN201110059286A CN102684657A CN 102684657 A CN102684657 A CN 102684657A CN 2011100592867 A CN2011100592867 A CN 2011100592867A CN 201110059286 A CN201110059286 A CN 201110059286A CN 102684657 A CN102684657 A CN 102684657A
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- analog switch
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- negative pressure
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Abstract
The invention discloses a method for switching a negative pressure signal by using an ordinary analogue switch. According to the method, a circuit is added to a ground interface of the ordinary analogue switch to clamp the potential of the ground of the analogue switch, so that a negative-going signal passing through the analogue switch cannot be attenuated to the ground of the analogue switch, and the function of nondestructively switching the negative-going signal by using an analogue switch path is realized. By the method, the problem of negative-going signal clipping distortion during the negative-going signal switching of the ordinary analogue switch is solved, the cost of the ordinary analogue switch is far lower than that a special analogue switch with a negative pressure function, and a circuit implementation method is simple and easy to use, has stable and reliable functions, and is easily applied and popularized.
Description
Technical field
The present invention relates to the method that a kind of common simulation switching component switches negative pressure signal; Relate in particular to and a kind ofly carry out additional circuit through ground interface to the common simulation switch; The current potential on the ground of analog switch is carried out clamper; Make negative-going signal can not decline to the ground of analog switch, realize the harmless switch handoff functionality of analog switch path negative-going signal through analog switch.
Background technology
Analog switch is mainly used in the switching of the different paths of signal, and it is that signal lossless switches that optimal analog switch path switches.
Present stage, analog switch device is applied in the every field design of electronic products widely, and wherein some application relates to the switching of negative-going signal.When common analog switch switched negative-going signal, when negative-going signal voltage surpassed over the ground electrostatic protection diode forward voltage drop of chip, the amplitude that signal surpasses can clipped wave, causes signal negative pressure partial distortion; The analog switch of band negative pressure function is because chip internal produces a negative supply, so negative pressure signal can distortion through analog switch, but there is the defective that is higher than the common simulation switch on the cost in it.
The application that the method for a kind of common simulation switch switching of the present invention negative pressure signal relates to mainly is that analog switch switches negative-going signal is harmless; Be particularly suitable for being applied to the harmless design of switching of terminal electronic product audio signal; Negative-going signal clipping distortion problem when this method has solved common analog switch switching negative-going signal, cost is again far below the special analog switch of crossing negative pressure, and the circuit implementation method is simple and easy to use; Function-stable is reliable, is highly susceptible to using and promoting.
Summary of the invention
To the deficiency of prior art, goal of the invention of the present invention is to provide a kind of harmless method of switching negative-going signal of common simulation switch that realizes, through the present invention negative pressure signal has been carried out harmless path and has switched.
A kind of common simulation switch switches the method for negative pressure signal; Described this method is through giving electronic devices and components of ground pin string of analog switch; These electronic devices and components can be resistance or Schottky diode; The ground pin of analog switch chip is the ground of receiving the electron product circuit plate through Schottky diode or resistance like this; Electrostatic protection diode on the same analog switch signal path also is to have passed through the ground that diode that chip ground pin connects or resistance are linked into the electron product circuit plate, and the ground pin of analog switch chip will not be owing to will being zero potential by clamper after handling like this.When the ground of analog switch chip pin connect be Schottky diode the time; Clamp voltage on the chip path is the Schottky diode forward conduction current potential sum of electrostatic protection diode voltage and chip ground pin, passes through so the signal negative sense amplitude on the analog switch path all can can't harm to switch less than this clamp voltage basically.Same when the ground of analog switch chip pin connect be resistance the time, the negative pressure signal on the path forms the loop through the resistance of protection diode and chip ground pin string, will be to the resistance of going here and there for voltage consumption, thereby negative pressure signal can't harm switching on the path.
Described a kind of common simulation switching component switches the method for negative pressure signal, and the characteristics of analog switch are: utilize two MOS butt joints to guarantee the analog switch of substantially invariable low on-resistance.
Described a kind of common simulation switching component switches the method for negative pressure signal, and the signal of analog switch input comprises malleation and negative pressure signal, all can not surpass the scope restriction of regulation.Input malleation signal can not be higher than supply voltage (can not be higher than at most supply voltage add 0.3V to power protection diode forward conducting voltage sum); The input negative pressure signal, under the situation of analog switch ground pin string Schottky diode, negative pressure signal can not be lower than the clamp voltage of Schottky diode and electrostatic protection diode generation.Under the situation of the ground of analog switch pin crosstalk resistance, the negative voltage signal can not be unconfined big, otherwise can cause the deterioration of other parameters.
Described a kind of common simulation switch switches the method for negative pressure signal, and its implementation is different from the specialty of passing through a negative sense power supply of inside generation of specialty and crosses the negative pressure analog switch, is to utilize the clamper function of diode and resistance to realize, has great advantage on the cost.
Described a kind of common simulation switch switches the method for negative pressure signal; It uses main in the lower situation of input signal negative sense voltage; The audio input signal of terminal electronic product particularly, the parameters under the applicable cases when the input signal negative pressure is higher possibly have deterioration.
Described a kind of common simulation switch switches the method for negative pressure signal; Ground interface through to the common simulation switch carries out additional circuit; The current potential on the ground of analog switch is carried out clamper; Make negative-going signal can not decline to the ground of analog switch, realize the harmless switch handoff functionality of analog switch path negative-going signal through analog switch.
Beneficial effect of the present invention is; Negative-going signal clipping distortion problem when having solved common analog switch switching negative-going signal, cost is again far below the special analog switch of crossing negative pressure, and the circuit implementation method is simple and easy to use; Function-stable is reliable, is highly susceptible to using and promoting.
Description of drawings
Fig. 1 is an implementation sketch map of the present invention.
The output pin of the input pin 2-analog switch chip of 1-analog switch chip
The power pin of the control enable pin 4-analog switch chip of 3-analog switch chip
The ground pin 6-analog switch chip of 5-analog switch chip
7-Schottky diode 8-resistance is gone into pin
Embodiment
How further specify the present invention below in conjunction with accompanying drawing implements:
Shown in accompanying drawing 1; When 6 pairs of negative pressure signals of analog switch chip switch; The control enable pin 3 of analog switch chip enables effectively; Negative pressure signal is conducting to the output pin 2 of analog switch chip by the input pin 1 of analog switch chip; Protect diode (between the input pin 1 of analog switch chip and the power pin 4 of analog switch chip for TVS between the power pin 4 of analog switch chip and the output pin 2 of analog switch chip and between the ground pin 5 of the output pin 2 of analog switch chip and analog switch chip; Between the input pin 1 of analog switch chip and the ground pin 5 of analog switch chip this diode is arranged also); The amplitude of the negative pressure signal that the decision of the forward conduction voltage of this protection diode can be passed through, when the ground of the ground of analog switch chip pin 5 direct connection circuit plates, the input pin 1 of analog switch chip is conducting to the maximum undistorted negative voltage of output pin 2 of analog switch chip for protecting the clamp voltage of diode; When the ground of analog switch chip pin 5 is received the ground of circuit board through Schottky diode 7; Electrostatic protection diode on the analog switch signal path also is to have passed through the ground that Schottky diode 7 is linked into the electron product circuit plate, handles the ground pin of back analog switch chip like this owing to by clamper will be not zero potential.Clamp voltage on the chip path is electrostatic protection diode voltage and the outer Schottky diode 7 forward conduction current potential sums of chip in the chip, passes through so the signal negative sense amplitude on the analog switch path all can can't harm to switch less than this clamp voltage basically.Equally when the ground of analog switch chip pin 5 is gone into the ground that pin 8 receives circuit board through resistance; Negative pressure signal on the path forms the loop through the resistance of protection diode and chip ground pin string; Will for voltage consumption to the resistance of string, switch thereby negative pressure signal is harmless on the path.
Claims (4)
1. a common simulation switch switches the method for negative pressure signal; It is characterized in that: described this method is through giving electronic devices and components of ground pin string of analog switch; These electronic devices and components can be resistance or Schottky diode; The ground pin of analog switch chip is the ground of receiving circuit board through Schottky diode or resistance like this; Electrostatic protection diode on the same analog switch signal path also is to have passed through the ground that diode that chip ground pin connects or resistance are linked into circuit board, and the ground pin of analog switch chip will not be owing to will being zero potential by clamper after handling like this.
2. a kind of common simulation switch according to claim 1 switches the method for negative pressure signal; It is characterized in that: the ground interface of described common simulation switch carries out additional circuit; The current potential on the ground of analog switch is carried out clamper; Make negative-going signal can not decline to the ground of analog switch, realize the harmless switch handoff functionality of analog switch path negative-going signal through analog switch.
3. a kind of common simulation according to claim 1 is opened the method that part switches negative pressure signal, it is characterized in that: described analog switch utilizes two MOS butt joints to guarantee the analog switch of substantially invariable low on-resistance.
4. a kind of common simulation switch according to claim 1 switches the method for negative pressure signal; It is characterized in that: the signal of described analog switch input comprises malleation signal and negative pressure signal; The malleation signal can not be higher than supply voltage; Negative pressure signal can not be lower than the clamp voltage that Schottky diode and electrostatic protection diode produce under the situation of analog switch ground pin string Schottky diode; Under the situation of the ground of analog switch pin crosstalk resistance, the negative voltage signal can not be unconfined big.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100592867A CN102684657A (en) | 2011-03-11 | 2011-03-11 | Method for switching negative pressure signal by using ordinary analogue switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100592867A CN102684657A (en) | 2011-03-11 | 2011-03-11 | Method for switching negative pressure signal by using ordinary analogue switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102684657A true CN102684657A (en) | 2012-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100592867A Pending CN102684657A (en) | 2011-03-11 | 2011-03-11 | Method for switching negative pressure signal by using ordinary analogue switch |
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| Country | Link |
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| CN (1) | CN102684657A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422595A (en) * | 2021-08-24 | 2021-09-21 | 成都市易冲半导体有限公司 | Novel electronic switch for processing negative-pressure AC signal and control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5810926A (en) * | 1981-07-10 | 1983-01-21 | Matsushita Electric Ind Co Ltd | Switching circuit |
| CN101364804A (en) * | 2008-06-18 | 2009-02-11 | 中兴通讯股份有限公司 | Power-down protection apparatus of analogue switch |
| US20110057715A1 (en) * | 2009-09-08 | 2011-03-10 | Stmicroelectronics Asia Pacific Pte Ltd. | High bandwidth switch design |
-
2011
- 2011-03-11 CN CN2011100592867A patent/CN102684657A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5810926A (en) * | 1981-07-10 | 1983-01-21 | Matsushita Electric Ind Co Ltd | Switching circuit |
| CN101364804A (en) * | 2008-06-18 | 2009-02-11 | 中兴通讯股份有限公司 | Power-down protection apparatus of analogue switch |
| US20110057715A1 (en) * | 2009-09-08 | 2011-03-10 | Stmicroelectronics Asia Pacific Pte Ltd. | High bandwidth switch design |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113422595A (en) * | 2021-08-24 | 2021-09-21 | 成都市易冲半导体有限公司 | Novel electronic switch for processing negative-pressure AC signal and control method thereof |
| CN113422595B (en) * | 2021-08-24 | 2021-11-19 | 成都市易冲半导体有限公司 | Electronic switch for processing negative voltage AC signal and control method thereof |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120919 |