CA1211718A - Solid state bilateral switch as an inverter - Google Patents
Solid state bilateral switch as an inverterInfo
- Publication number
- CA1211718A CA1211718A CA000449588A CA449588A CA1211718A CA 1211718 A CA1211718 A CA 1211718A CA 000449588 A CA000449588 A CA 000449588A CA 449588 A CA449588 A CA 449588A CA 1211718 A CA1211718 A CA 1211718A
- Authority
- CA
- Canada
- Prior art keywords
- switch
- switching device
- bilateral
- inverter
- conducting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
ABSTRACT OF THE DISCLOSURE
SOLID STATE BILATERAL SWITCH AS AN INVERTER
Solid state component packages frequently include a plurality of similar circuit configurations and, inevitably, a circuit designer has a surplus or a shortage of selected configurations. When an inverter shortage and a bilateral switch surplus exist concurrently, the switch may be substituted for an inverter, according to this invention.
SOLID STATE BILATERAL SWITCH AS AN INVERTER
Solid state component packages frequently include a plurality of similar circuit configurations and, inevitably, a circuit designer has a surplus or a shortage of selected configurations. When an inverter shortage and a bilateral switch surplus exist concurrently, the switch may be substituted for an inverter, according to this invention.
Description
lZ~'71~
BACE~GROUND O~ THE INY~NTZON
The present invention relates to the efficient use of solid state components forcircuit control. Technology has advanced enormously in recent years to provide components not previously available which are smaller and more economical than the parts that they replace. Indeed, the new components ha Je become so small and economical that it is customary to design a package including a plurality of components in the single package. For example, a solid state component Inay include several AND
gates and another cornponent may include several NOR gates. Another paekage may include a plurality of inverters and yet another component a plurality of amplifiers ar.d so on. The inclusion of a plurality of elements in a single package sometimes results in a surplus of available elements. This ma!,~ come about because, for example~ the circuit designer required less than the number avail&ble in one or more standard component.
In order to make more eff}c}ent use ol star.dard csmponents with a plurality of elements therein, circuit desi~ners have become adept at making circuit modifications which permit more efficient use o standard cornponents although it sometimes results in a circuit whose function is not obvious from the nature of the component.
It is an object of the present invention to provide the circuit designer with a technique for the efficient use of standnrd components wherein the designer has a need for ~r inverter when no;le is available although an element of a ~ilateral switch is available.
It is a more specific object of the invention to use one section of a bilateral switch as an inverter.
It is another object of the invention to provide first and second bilateral switches which respond to the same control signal so that one switch opens while the other closes.
It is another object of the invention to use one section of a bilateral switch to control a second section of the bilateral switch such that the second section of the bilateral switch will always have an opposite bistable state as compared with the first section of the bilateral switch.
It will not be here ~ttempted to se~ fortt~ and indicate all the various obJects ar.d advantages incident to the invention, but other objects alld advantages will be referred to, or else will become apparent from that which fo~lows.
i7~3 SU~lMAP.Y O~ THE INVENl~ON
A solid state bilateral switch is a three terminal device which is open circuited and conducting between two of the terminals of the device when the third terminal is at first and second potentials, respectively. By connecting a first potential to the input of a bilateral switch and connecting the output of the bilateral switch, through a resistor, 5 to a second potential, one obtains the equivalent of an inverter from the bilateral switch when the potentials are chosen such that with the first potential applied to the control lead the bilateral switch is opened and with the second potential applied to the control lead the bilateral switch is closed. That is, with the circuit as described the potential at the output of the bilateral switch will be the inverse of the control 1 0 potential.
By this circuit means a spare bilateral switch can be made to serve as an inverter when an inverter is not otherwise available and it would otherwise have been necessary to provide an additional component with a plurality of inverters. That is, by making use of the surplus bilateral switch the cost of the total circuit is reduced since it is not 15 necessary to add an addtional component to provide an extra inverter which would otherwise have been required.
BRE~ DESCRIPTION O~ T~ DRAWING
A circuit drawing is provided using standard symbolism and wherein:
Figure 1 illustrates a simple old art circuit using electromechanicRl switching devices;
Figure 2 discloses a prior art circuit using standard, solid state components; and 20 Figure 3 illustrates the invention wherein a bilateral switch serves as an inverter.
The three circuits shown perform generally similar functions and elements of each circuit which are generally comparRble have been given corresponding identification numbers except for the first digit thereof which corresponds with the figure number.
It is believed that the various figures will permit an incisive and detailed analysis 25 of the operational characteristics of the invention. The drawing discloses one form of invention and is not meant in any way to delimit its scope. It is rather so drawn as an aid in an understanding of the invention '7~3 DESCRIPTION O~ THE PRE~RRED EMBOI)IMl~NT
It should be undestood that the circuit in which the invention is described is illustrative only and that the inventive concept could be used in a wide veriety of circuit configurations. In the illustrated conIiguration, it will be shown how an audio signal from a first and second signal source may be selectively applied to an amplifier and a loud speaker.
Condidering first Figure 1 and simple and old techniques, there will be seen a switch 101 which may be manually actuated for selectively activating a control device 111, which, in this illustration, comprises a relay. When the switch 101 is closed, a positive potential indicated as +V will pass through the closed contacts of the switch 101 to actiYate the control device, or relay, 111 which is electrically connected to a-V
potential. Operation of the control device 111 will alter the contacts 112 and 113 closing the former and opening the latter.
lA and IB are presumed to be separate sources of audio signals and therefore, itwill be seen that while the contacts 113 are closed, the audio signals from source LA
will pass through the closed contacts 113 and pass to the amplifier 121 and to the loud speaker 131. When the switch 101 is closed to activate the control device 111 and close the contacts 112, it will be seen that audio signals from source lB will pass throu~h now-closed contacts 112 and the ampli~ier 121 to the speaker 131. By this means, the speaker 131 may be caused to selectively reproduce audio signals from source lA or lB.
It will be appreciated that the manual switch 101 and the relay 111 together with its contacts 11a and 113 provides a perfectly satisfactory and very simple technique for selectively switching between either of two audio signals. However, the switch relay and contacts are relatively buL'cy and expensive circuit elements as compared with modern solid state switching devices. Accordingly, in order to provide more economical and compact equipment an equivalent circuit was provided in the prior art according to that shown in Figure 2.
Considering now more recent prior art as illustrated in ~igure ~, there mRy be aswitch 201 comprising a transfer combination so that either a -V potential or a +V
potential may be applied to the lead 202 depending upon the position of the switch 201.
With the switch 201 positioned as illustrated, a-V potential will be applied to the lead 202 and to the inverter 241. A characteristic of an inverter is that the potential at its output is the inverse of the potential at its input. Accordingly, the potential on lead 242 will be a +V when a -V is applied to lead 202. The positive potential on led 242 is applied to the control lead of the bilateral switch 213.
~'~11'7~L~
The bilateral switch 213 comprises a solid state sw;tching device such as the COS/MOS ~uad b l~teral switch manufactured by RCA and identified as CD4066B. That is, the cited bilateral switch comprises a total of four switches similar to the one illustrated as element 213. The four solid state bilateral switches may be contained in an element measuring approximately 0.75 X 0.25 inches and 0.125 thick The quad bilateral switch, as manufactured, includes fourteen terminals comprising three for each of the four bilateral switches and two for a power supply. More complete details are readily Rvailable from manufacturer's specifications of this quad bilateral switch or similar or equivalent switches. The switch 213 includes an input lead 214, an output lead 215 and, as previously mentioned, a control lead to which the lead 242 from the inverter 241 is connected. When a positive potential is applied to the control lead 242, the bilateral switch 213 will be closed providing a low impedence connection between the input lead 214 and the output lead 215. Accordingly, an audio signal from the source 2A may pass through the bilateral switch 213 and be applied to the amplifier 221 and be reproduced by the loud speaker 231.
In addition to the bilateral switch 213, there is another bilateral switch 212. The bilateral switch 212 has an input 216 and and output lead 217 and a control lead 218. As may be seen, the control lead 218 is electrically connected to the lead 202 and therefore, while the switch 201 is in the position illustrated, a potential of -V will be applied to the control lead 21~. It is a characteristic of the bilateral switches that when a negative potential is applied to the control lead, there will be a high impedence between the input lead and the output lead. Accordingly, while a negative potential is applied to the control lead 218, the audio signal from the source 2B cannot pass through the bilateral switch 212 to be applied to the amplifier 221 and the loud speaker 231.
It shouid be apparent that the -V potential passed through the switch 201 to thelead 202 is concurrently applied to the inverter 241 and to the bilateral switch 212 and the inverter causes the application of a positive potential on the control lead 242 of the bilateral switch 213. Accordingly, the control leads of the bilateral switches 213 and 212 will always have opposite potentials and therefore, while one of the bilateral switches 212 and 213 is opened, the ~ther will be closed. Accordingly, the bilateral switches 212 and 213 can be caused to function in a manner substantially identical to that of the contacts 112 and 113 of Figure 1.
In response to the manual actuation of the switch 2~1, a +V potential will be applied through a resistor to the lead 202. This will cause the application of a positive potential to the control lead 218 of bilateral switch 212 thereby providing a low impedence circuit between the input lead 216 and the output lead 217 while concurrently causing the ~Lpplication of a-V potential to the control lead 242 of the bilateral switch 213 thereby providing a high impedence circuit between the input lead 214 and the output lead 215. Accordingly, in response to the actuation of the switch 201, the audio signal from the source 2B will be applied to the ampli~ier 221 and reproduced by the loud speaker 231.
Thus, as may be seenl the circuit of Figure 2 produces substantially the same electrical results as the circuit of Figure 1. Although the circuit of Figure 2 appears to have more components than that of Figure 1, it should be understood that the size and cost of the components of Figure 2 are substantially less than the components of Figure 1. However, the switch 201 of Fi~ure 2 is still illustrated as a mechanical device and an engineer can readily envision numerous circumstances wherein it would be desirable to cause the switch 201 to be activated in response to electrical signals. The circuit of Figure 3 will provide solid state switchlng devices for replacing the switch 201 of Figure 2 and for replacing the inverter 241 with a surplus bilateral switch.
Considering now more specifically the circuit configuration illustrated in ~igure 3, it should be understood that modern manufacturing techniques have made it generally more economical to provide a quad bilateral switch which includes four separate and independent switches rather than to provide configurations with one bilateral switch, another configuration with two bilateral switches, another configuration with three bilateral switches and so on. That is, bilateral switches and other devices are~customarily provided in a package of a plurality of such devices~ Frequen$1y this may result in unused devices. Devices provided in packages of multiple devices include:
inverters; amplifiers; gates and other components.
Any qualified circuit designer can design a complex circuit using a wide variety of available packages of components to implement his design concepts and produce the
BACE~GROUND O~ THE INY~NTZON
The present invention relates to the efficient use of solid state components forcircuit control. Technology has advanced enormously in recent years to provide components not previously available which are smaller and more economical than the parts that they replace. Indeed, the new components ha Je become so small and economical that it is customary to design a package including a plurality of components in the single package. For example, a solid state component Inay include several AND
gates and another cornponent may include several NOR gates. Another paekage may include a plurality of inverters and yet another component a plurality of amplifiers ar.d so on. The inclusion of a plurality of elements in a single package sometimes results in a surplus of available elements. This ma!,~ come about because, for example~ the circuit designer required less than the number avail&ble in one or more standard component.
In order to make more eff}c}ent use ol star.dard csmponents with a plurality of elements therein, circuit desi~ners have become adept at making circuit modifications which permit more efficient use o standard cornponents although it sometimes results in a circuit whose function is not obvious from the nature of the component.
It is an object of the present invention to provide the circuit designer with a technique for the efficient use of standnrd components wherein the designer has a need for ~r inverter when no;le is available although an element of a ~ilateral switch is available.
It is a more specific object of the invention to use one section of a bilateral switch as an inverter.
It is another object of the invention to provide first and second bilateral switches which respond to the same control signal so that one switch opens while the other closes.
It is another object of the invention to use one section of a bilateral switch to control a second section of the bilateral switch such that the second section of the bilateral switch will always have an opposite bistable state as compared with the first section of the bilateral switch.
It will not be here ~ttempted to se~ fortt~ and indicate all the various obJects ar.d advantages incident to the invention, but other objects alld advantages will be referred to, or else will become apparent from that which fo~lows.
i7~3 SU~lMAP.Y O~ THE INVENl~ON
A solid state bilateral switch is a three terminal device which is open circuited and conducting between two of the terminals of the device when the third terminal is at first and second potentials, respectively. By connecting a first potential to the input of a bilateral switch and connecting the output of the bilateral switch, through a resistor, 5 to a second potential, one obtains the equivalent of an inverter from the bilateral switch when the potentials are chosen such that with the first potential applied to the control lead the bilateral switch is opened and with the second potential applied to the control lead the bilateral switch is closed. That is, with the circuit as described the potential at the output of the bilateral switch will be the inverse of the control 1 0 potential.
By this circuit means a spare bilateral switch can be made to serve as an inverter when an inverter is not otherwise available and it would otherwise have been necessary to provide an additional component with a plurality of inverters. That is, by making use of the surplus bilateral switch the cost of the total circuit is reduced since it is not 15 necessary to add an addtional component to provide an extra inverter which would otherwise have been required.
BRE~ DESCRIPTION O~ T~ DRAWING
A circuit drawing is provided using standard symbolism and wherein:
Figure 1 illustrates a simple old art circuit using electromechanicRl switching devices;
Figure 2 discloses a prior art circuit using standard, solid state components; and 20 Figure 3 illustrates the invention wherein a bilateral switch serves as an inverter.
The three circuits shown perform generally similar functions and elements of each circuit which are generally comparRble have been given corresponding identification numbers except for the first digit thereof which corresponds with the figure number.
It is believed that the various figures will permit an incisive and detailed analysis 25 of the operational characteristics of the invention. The drawing discloses one form of invention and is not meant in any way to delimit its scope. It is rather so drawn as an aid in an understanding of the invention '7~3 DESCRIPTION O~ THE PRE~RRED EMBOI)IMl~NT
It should be undestood that the circuit in which the invention is described is illustrative only and that the inventive concept could be used in a wide veriety of circuit configurations. In the illustrated conIiguration, it will be shown how an audio signal from a first and second signal source may be selectively applied to an amplifier and a loud speaker.
Condidering first Figure 1 and simple and old techniques, there will be seen a switch 101 which may be manually actuated for selectively activating a control device 111, which, in this illustration, comprises a relay. When the switch 101 is closed, a positive potential indicated as +V will pass through the closed contacts of the switch 101 to actiYate the control device, or relay, 111 which is electrically connected to a-V
potential. Operation of the control device 111 will alter the contacts 112 and 113 closing the former and opening the latter.
lA and IB are presumed to be separate sources of audio signals and therefore, itwill be seen that while the contacts 113 are closed, the audio signals from source LA
will pass through the closed contacts 113 and pass to the amplifier 121 and to the loud speaker 131. When the switch 101 is closed to activate the control device 111 and close the contacts 112, it will be seen that audio signals from source lB will pass throu~h now-closed contacts 112 and the ampli~ier 121 to the speaker 131. By this means, the speaker 131 may be caused to selectively reproduce audio signals from source lA or lB.
It will be appreciated that the manual switch 101 and the relay 111 together with its contacts 11a and 113 provides a perfectly satisfactory and very simple technique for selectively switching between either of two audio signals. However, the switch relay and contacts are relatively buL'cy and expensive circuit elements as compared with modern solid state switching devices. Accordingly, in order to provide more economical and compact equipment an equivalent circuit was provided in the prior art according to that shown in Figure 2.
Considering now more recent prior art as illustrated in ~igure ~, there mRy be aswitch 201 comprising a transfer combination so that either a -V potential or a +V
potential may be applied to the lead 202 depending upon the position of the switch 201.
With the switch 201 positioned as illustrated, a-V potential will be applied to the lead 202 and to the inverter 241. A characteristic of an inverter is that the potential at its output is the inverse of the potential at its input. Accordingly, the potential on lead 242 will be a +V when a -V is applied to lead 202. The positive potential on led 242 is applied to the control lead of the bilateral switch 213.
~'~11'7~L~
The bilateral switch 213 comprises a solid state sw;tching device such as the COS/MOS ~uad b l~teral switch manufactured by RCA and identified as CD4066B. That is, the cited bilateral switch comprises a total of four switches similar to the one illustrated as element 213. The four solid state bilateral switches may be contained in an element measuring approximately 0.75 X 0.25 inches and 0.125 thick The quad bilateral switch, as manufactured, includes fourteen terminals comprising three for each of the four bilateral switches and two for a power supply. More complete details are readily Rvailable from manufacturer's specifications of this quad bilateral switch or similar or equivalent switches. The switch 213 includes an input lead 214, an output lead 215 and, as previously mentioned, a control lead to which the lead 242 from the inverter 241 is connected. When a positive potential is applied to the control lead 242, the bilateral switch 213 will be closed providing a low impedence connection between the input lead 214 and the output lead 215. Accordingly, an audio signal from the source 2A may pass through the bilateral switch 213 and be applied to the amplifier 221 and be reproduced by the loud speaker 231.
In addition to the bilateral switch 213, there is another bilateral switch 212. The bilateral switch 212 has an input 216 and and output lead 217 and a control lead 218. As may be seen, the control lead 218 is electrically connected to the lead 202 and therefore, while the switch 201 is in the position illustrated, a potential of -V will be applied to the control lead 21~. It is a characteristic of the bilateral switches that when a negative potential is applied to the control lead, there will be a high impedence between the input lead and the output lead. Accordingly, while a negative potential is applied to the control lead 218, the audio signal from the source 2B cannot pass through the bilateral switch 212 to be applied to the amplifier 221 and the loud speaker 231.
It shouid be apparent that the -V potential passed through the switch 201 to thelead 202 is concurrently applied to the inverter 241 and to the bilateral switch 212 and the inverter causes the application of a positive potential on the control lead 242 of the bilateral switch 213. Accordingly, the control leads of the bilateral switches 213 and 212 will always have opposite potentials and therefore, while one of the bilateral switches 212 and 213 is opened, the ~ther will be closed. Accordingly, the bilateral switches 212 and 213 can be caused to function in a manner substantially identical to that of the contacts 112 and 113 of Figure 1.
In response to the manual actuation of the switch 2~1, a +V potential will be applied through a resistor to the lead 202. This will cause the application of a positive potential to the control lead 218 of bilateral switch 212 thereby providing a low impedence circuit between the input lead 216 and the output lead 217 while concurrently causing the ~Lpplication of a-V potential to the control lead 242 of the bilateral switch 213 thereby providing a high impedence circuit between the input lead 214 and the output lead 215. Accordingly, in response to the actuation of the switch 201, the audio signal from the source 2B will be applied to the ampli~ier 221 and reproduced by the loud speaker 231.
Thus, as may be seenl the circuit of Figure 2 produces substantially the same electrical results as the circuit of Figure 1. Although the circuit of Figure 2 appears to have more components than that of Figure 1, it should be understood that the size and cost of the components of Figure 2 are substantially less than the components of Figure 1. However, the switch 201 of Fi~ure 2 is still illustrated as a mechanical device and an engineer can readily envision numerous circumstances wherein it would be desirable to cause the switch 201 to be activated in response to electrical signals. The circuit of Figure 3 will provide solid state switchlng devices for replacing the switch 201 of Figure 2 and for replacing the inverter 241 with a surplus bilateral switch.
Considering now more specifically the circuit configuration illustrated in ~igure 3, it should be understood that modern manufacturing techniques have made it generally more economical to provide a quad bilateral switch which includes four separate and independent switches rather than to provide configurations with one bilateral switch, another configuration with two bilateral switches, another configuration with three bilateral switches and so on. That is, bilateral switches and other devices are~customarily provided in a package of a plurality of such devices~ Frequen$1y this may result in unused devices. Devices provided in packages of multiple devices include:
inverters; amplifiers; gates and other components.
Any qualified circuit designer can design a complex circuit using a wide variety of available packages of components to implement his design concepts and produce the
2 5 desired results. However, a competent circuit desi~ner is conscious of costconsiderations together with space considerations and constantly strives for design $echniques which provide for the most effective and efficient use of the componentsO
That is, although the solid state components have become very small and economical, it is possible to obtain further economies if the number of units required is kept to a minimum. To this end, skilled circuit desingers have developed numerous ingenious circuits and techniques which are cost efficient. Figure 3 illustra$es a technique wherein a bilater~l switch is substituted for an inverter in a situation wherein no inverter was available in any package, i.e. all inverter packages are fully utilized, and a quad bilateral switch packa~e had an unused bilateral switch.
Considering now more specifically Figure 3 there will be seen two bilateral switch components 312 and 313, each Or which have input, output and control leads 1;~11 718 similar to those described with respect to bilateral switches 212 and 213. And it lwill be seen that when bilateral switch 313 has a low impedence between its input lead 314 and its output lead 315 the audio signal from source 3A will be applied through amplifier 321 to the loud speaker 331. In like manner, when the bilateral switch 312 is in its conducting state, the audio signal from source 3B will be applied to the amplifier 3~1 and the loud speaker 331.
The switch 201 has been replaced by an AND gate 301 which may have two input leads 303 and 304 as well as an output lead 305. For purposes of this circuit, the AND
gate 305 may be considered to be of the type wherein the output lead 305 is at apositive potential at all times except when both input leads are at a negative potential.
If the AND gate 301 is presumed to be in the condition wherein there is a positive potential at the output terminal 305, it- will be seen that this positive potential is applied to the control lead 318 of the bilateral switch 313 and that therefore there is a low impedence circuit between the input lead 314 and the output lead 315 and therefore, the audio signal from source 3A will pass through the bilateral swtich 313 to the amplifier 321 and the loud speaker 331. Concurrently, the positive potential ~t the output lead 305 of the AND gate 301 will be applied to the control lead 343 of the bilateral switch 341. Accordingly, the bilateral switch 341 will be activated and the negative potential on input lead 344 will be applied to output lead 342 and be app~ie~ as an input to the control lead of bilateral switch 312. Accordingly, the bilaterPl switch 312 will be maintained with a high impedence circuit between the input and input leads 316 and 317, respectively.
At some other time when both of the inputs 303 and 304 of the AND gate 301 are at a negative potential, the output 305 will assume a negative potential thereby, in effect, opening the bilateral switches 313 and 341. When the bilateral switch 341 is opened by the application of the negatiYe potential to the control lead 3439 the negative po$ential is no longer applied to the control lead 342 of the bilateral switch 312 and a positive potential will be applied through resistor 351 to the control lead 342 and the bilateral switch 31a will be activated thereby allowing the audio signal from the source 3B to be applied to the amplifier 321 and the loud speaker 331.
A comparison of the circui~s OI Figures 2 and 3 will now show that the Wateral switch 341 of Figure 3 peformed identically the same function as the inverter 241 of Figure 2. That is, a negative input to the inverter 241 caused a positive input to the bilateral switch 213 and a positive input to the inverter 241 caused a negative input to the bilateral switch 213. In like manner, a negative input to the bilateral switch 341 resulted in a positive input to the bilateral switch 312 and a positive input to the control le~d of the bilateral switch 341 resulted in the application of a negative potential to the b}~ateral switch 312. Accordingly, a bilateral switch has, in effect, been converted to an inverter.
It should be understood that one or more elements of a quad bilateral switch could be adapted to be used as an inverter as described hereinaboYe. Normally, this technique would be used only in a circumstance wherein design considerations require the use of an inverter and there is no available inverter while concomitantly there is a surplus bilateral switch.
While there has been shown and described what is considered at present to be thepreferred embodiment of the invention, modifications thereto will readily occur to those skilled in the related arts. For example, the output of the bilateral swtich serving as an inverter could be applied to an AN~ or to an OR gate or any other device as may be expedient. It is belieYed that no further analysis or description is required and that the foregoing so fully reveals the gist of the present invention that those skilled in the applicable arts can adapt it to meet the exigencies of their specific requirements. It is not de~ired, therefore, that the invention be limited to the embodiments shown and described and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of the inventiorl.
That is, although the solid state components have become very small and economical, it is possible to obtain further economies if the number of units required is kept to a minimum. To this end, skilled circuit desingers have developed numerous ingenious circuits and techniques which are cost efficient. Figure 3 illustra$es a technique wherein a bilater~l switch is substituted for an inverter in a situation wherein no inverter was available in any package, i.e. all inverter packages are fully utilized, and a quad bilateral switch packa~e had an unused bilateral switch.
Considering now more specifically Figure 3 there will be seen two bilateral switch components 312 and 313, each Or which have input, output and control leads 1;~11 718 similar to those described with respect to bilateral switches 212 and 213. And it lwill be seen that when bilateral switch 313 has a low impedence between its input lead 314 and its output lead 315 the audio signal from source 3A will be applied through amplifier 321 to the loud speaker 331. In like manner, when the bilateral switch 312 is in its conducting state, the audio signal from source 3B will be applied to the amplifier 3~1 and the loud speaker 331.
The switch 201 has been replaced by an AND gate 301 which may have two input leads 303 and 304 as well as an output lead 305. For purposes of this circuit, the AND
gate 305 may be considered to be of the type wherein the output lead 305 is at apositive potential at all times except when both input leads are at a negative potential.
If the AND gate 301 is presumed to be in the condition wherein there is a positive potential at the output terminal 305, it- will be seen that this positive potential is applied to the control lead 318 of the bilateral switch 313 and that therefore there is a low impedence circuit between the input lead 314 and the output lead 315 and therefore, the audio signal from source 3A will pass through the bilateral swtich 313 to the amplifier 321 and the loud speaker 331. Concurrently, the positive potential ~t the output lead 305 of the AND gate 301 will be applied to the control lead 343 of the bilateral switch 341. Accordingly, the bilateral switch 341 will be activated and the negative potential on input lead 344 will be applied to output lead 342 and be app~ie~ as an input to the control lead of bilateral switch 312. Accordingly, the bilaterPl switch 312 will be maintained with a high impedence circuit between the input and input leads 316 and 317, respectively.
At some other time when both of the inputs 303 and 304 of the AND gate 301 are at a negative potential, the output 305 will assume a negative potential thereby, in effect, opening the bilateral switches 313 and 341. When the bilateral switch 341 is opened by the application of the negatiYe potential to the control lead 3439 the negative po$ential is no longer applied to the control lead 342 of the bilateral switch 312 and a positive potential will be applied through resistor 351 to the control lead 342 and the bilateral switch 31a will be activated thereby allowing the audio signal from the source 3B to be applied to the amplifier 321 and the loud speaker 331.
A comparison of the circui~s OI Figures 2 and 3 will now show that the Wateral switch 341 of Figure 3 peformed identically the same function as the inverter 241 of Figure 2. That is, a negative input to the inverter 241 caused a positive input to the bilateral switch 213 and a positive input to the inverter 241 caused a negative input to the bilateral switch 213. In like manner, a negative input to the bilateral switch 341 resulted in a positive input to the bilateral switch 312 and a positive input to the control le~d of the bilateral switch 341 resulted in the application of a negative potential to the b}~ateral switch 312. Accordingly, a bilateral switch has, in effect, been converted to an inverter.
It should be understood that one or more elements of a quad bilateral switch could be adapted to be used as an inverter as described hereinaboYe. Normally, this technique would be used only in a circumstance wherein design considerations require the use of an inverter and there is no available inverter while concomitantly there is a surplus bilateral switch.
While there has been shown and described what is considered at present to be thepreferred embodiment of the invention, modifications thereto will readily occur to those skilled in the related arts. For example, the output of the bilateral swtich serving as an inverter could be applied to an AN~ or to an OR gate or any other device as may be expedient. It is belieYed that no further analysis or description is required and that the foregoing so fully reveals the gist of the present invention that those skilled in the applicable arts can adapt it to meet the exigencies of their specific requirements. It is not de~ired, therefore, that the invention be limited to the embodiments shown and described and it is intended to cover in the appended claims all such modifications as fall within the true spirit and scope of the inventiorl.
Claims (6)
PRIVELAGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1) In combination:
(a) a solid state device comprising a plurality of bilateral switching devices each of which may be set to a conducting and a non-conducting state between an individual input and an individual output germinal when an individually associated control terminal is coupled to a first and second bias potential, respectively;
(b) one of said switching devices having its individual input and output terminals coupled to said second and said first bias potentials, respectively; and wherein (c) said first bias potential is provided through a resister whereby said output terminal of said one switching device has a bias potential which is the inverse of the bias potential applied to said control terminal of said one switching device.
(a) a solid state device comprising a plurality of bilateral switching devices each of which may be set to a conducting and a non-conducting state between an individual input and an individual output germinal when an individually associated control terminal is coupled to a first and second bias potential, respectively;
(b) one of said switching devices having its individual input and output terminals coupled to said second and said first bias potentials, respectively; and wherein (c) said first bias potential is provided through a resister whereby said output terminal of said one switching device has a bias potential which is the inverse of the bias potential applied to said control terminal of said one switching device.
2) The combination as set forth in claim 1 wherein the output terminal of said one switching device is coupled to the control terminal of a second switching device from causing said second switching device to be conducting and non-conducting when said one switching device is non-conducting and conducting, respectively.
3) The combination as set forth in claim 2 and wherein a third switching device has its control terminal coupled in like manner as said one switching device and wherein the output of said second and third switching devices are connected in common whereby second and third switching devices conjointly comprise a transfer switching device.
4) The combination as set forth in claim 1 wherein the output terminal of said one switching device is coupled to the control terminal to another device for causing said another switching device to assume said conducting and non-conducting conditions when said control terminal of said one switching device is at said second and first potentials, respectively.
5) The combination as set forth in claim 4 and including a third switching device having its control terminal coupled in common with that of said one switching device whereby one of said another and said third switching devices is conducting while the remaining device is non-contacting.
6) The combination as set forth in claim 5 wherein said another and said third switching devices have one of their output terminals coupled in common whereby said another and said third switching devices conjointly comprise a transfer switching device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48896483A | 1983-04-27 | 1983-04-27 | |
| US488,964 | 1983-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211718A true CA1211718A (en) | 1986-09-23 |
Family
ID=23941842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000449588A Expired CA1211718A (en) | 1983-04-27 | 1984-03-14 | Solid state bilateral switch as an inverter |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1211718A (en) |
-
1984
- 1984-03-14 CA CA000449588A patent/CA1211718A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4157480A (en) | Inverters and logic gates employing inverters | |
| US3609661A (en) | Matrix having mos cross-points controlled by mos multivibrators | |
| CA1211718A (en) | Solid state bilateral switch as an inverter | |
| GB1026841A (en) | Automatic control switchboard assembly | |
| HK76292A (en) | Integrated semiconductor memory | |
| JPS58197921A (en) | Coupling element with emitter follower as input circuit | |
| US3651467A (en) | Electronic multiselector having large and small geometry mos transistor crosspoint control | |
| HK23192A (en) | Integrated semiconductor memory | |
| GB1103538A (en) | Electrical switching circuit | |
| KR890000953A (en) | integrated circuit | |
| CA2053322A1 (en) | Integrated circuit and gate array | |
| DK0620628T3 (en) | ||
| SU1406764A1 (en) | Memorizing distributor | |
| DE69502768D1 (en) | Electrically configurable matrix for connections between lines with at least one input / output gate for electrical signals | |
| KR100268948B1 (en) | Transmission gate circuit | |
| KR19990030234A (en) | Logic gate | |
| JPH0329512A (en) | Semiconductor analog switch | |
| SU1559401A1 (en) | N-channel switchboard | |
| JPS57101430A (en) | Termination resistor chip provided with tie-up means | |
| JPH0661962A (en) | Semiconductor flying capacitor multiplexer | |
| KR0139860B1 (en) | The function expanding method of data i/o terminal for semiconductor tester | |
| GB945422A (en) | Method and circuit arrangement for improving the operating reliability of telecommunication switching systems | |
| JPH01194713A (en) | Semiconductor integrated circuit device | |
| JPS5797226A (en) | Signal switching circuit | |
| CS224896B1 (en) | Circuit for control of diode bridge switch |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |