WO2008055987A1 - Transistor arrangement for an analog switch, and method for designing the same - Google Patents
Transistor arrangement for an analog switch, and method for designing the same Download PDFInfo
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- WO2008055987A1 WO2008055987A1 PCT/EP2007/062169 EP2007062169W WO2008055987A1 WO 2008055987 A1 WO2008055987 A1 WO 2008055987A1 EP 2007062169 W EP2007062169 W EP 2007062169W WO 2008055987 A1 WO2008055987 A1 WO 2008055987A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/0203—Particular design considerations for integrated circuits
- H01L27/0207—Geometrical layout of the components, e.g. computer aided design; custom LSI, semi-custom LSI, standard cell technique
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/08—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind
- H01L27/085—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only
- H01L27/088—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate
- H01L27/092—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including only semiconductor components of a single kind including field-effect components only the components being field-effect transistors with insulated gate complementary MIS field-effect transistors
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/06—Modifications for ensuring a fully conducting state
- H03K17/063—Modifications for ensuring a fully conducting state in field-effect transistor switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
Definitions
- the present invention relates to a transistor arrangement and a method for designing a transistor arrangement.
- Analog switches are often formed as a transistor arrangement with a parallel connection of a first and a second transistor.
- An analog switch is understood to be a switch which, for example, switches analog signals.
- the first transistor is usually realized as an n-channel field effect transistor and the second transistor as a p-channel field effect transistor. In an open operating state of the analog switch, both transistors are switched off and in a closed operating state both transistors are turned on.
- Such an arrangement is referred to as transmission gate.
- the object of the present invention is to provide a transistor arrangement and a method for designing a transistor arrangement, which enable a low on resistance of the transistor arrangement.
- a transistor arrangement comprises a parallel circuit comprising a first transistor, a second transistor and a third transistor.
- the first Transistor has a first conductivity type and the second transistor has a second conductivity type.
- a low on resistance can be achieved by the parallel connection of the third transistor to the first and the second transistor.
- the degrees of freedom in the design of the transistor arrangement are increased by means of the third transistor, so that default values for the maximum on-resistance or for a fluctuation range of the on-resistance are more easily adjustable.
- Fluctuation width of the on-resistance is called the distance of the maximum value from the minimum value of the on-resistance during operation with different voltages to be switched.
- the first, second, and third transistors each include first and second transistor ports of a controlled path and a control port.
- the transistor arrangement comprises a first and a second terminal. The first terminal is connected to the respective first transistor terminals of the three transistors. The second terminal is connected to the respective second transistor terminals of the three transistors.
- an imaginary connecting straight line extends between the first and the second connection through the first, the second and the third transistor. The first, the second and the third transistor are connected in parallel, so that the currents add through the three transistors.
- the first transistor terminals of the three transistors are directly connected to the first terminal.
- the second transit Toran ensure the three transistors directly connected to the second terminal.
- a semiconductor body may comprise the three transistors.
- the two terminals can be designed as bondable terminals of the semiconductor body.
- the two terminals can each have a pad, English bond pedals.
- the first transistor comprises a first surface which is substantially rectangular in shape and has first and second side lengths.
- the second transistor has a second surface which is formed substantially at right angles and has a third and a fourth side length.
- the third transistor comprises a third surface which is substantially rectangular in shape and has a fifth and a sixth side length.
- substantially rectangular it is meant that an angle has a value of an interval between 70 and 110 degrees. Preferably, the angle has a value from an interval between 80 and 100 degrees.
- the first, third and fifth page lengths are the same length. In an alternative embodiment, it is provided that a deviation of plus / minus 20 percent is allowed. Again, alternatively, a deviation of plus / minus five percent is possible.
- the second surface is disposed between the first and third surfaces.
- the first surface is realized symmetrically with respect to the third surface with respect to a first axis of symmetry.
- the second surface is formed symmetrically with respect to the first axis of symmetry.
- the connection surface of the first connection is symmetrical with respect to - A -
- the area of a transistor which defines the doped semiconductor regions of the transistor is defined as the area of a transistor.
- the first port is adjacent to the first side length of the first surface.
- the second terminal is adjacent to the fifth side length of the third area.
- the first, second and third surfaces are each formed symmetrically with respect to a second axis of symmetry.
- the second axis of symmetry extends through the first and the second connection.
- the pads of the first and second terminals are each symmetrical to the second axis of symmetry.
- the second axis of symmetry is orthogonal to the first axis of symmetry.
- the second axis of symmetry corresponds to the mental connecting line.
- the third transistor has the first conductivity type.
- the second transistor is arranged spatially between the first and the third transistor.
- the first conductivity type is different from the second conductivity type.
- the first conductivity type is p-type and the second conductivity type is n-type.
- the three transistors may be formed as field effect transistors.
- the three transistors are each realized as a metal oxide semiconductor field effect transistor, abbreviated MOSFET.
- the first and the third transistor are each formed as a p-channel MOSFET and the second transistor as an n-channel MOSFET.
- the first, second and third transistors each include a source region and a drain region. The source and the drain region of a transistor are connected to the first and the second transistor terminal of the respective transistor.
- the area of a transistor which includes the source region, the drain region and the channel region of the respective field effect transistor can be defined as the surface of a transistor.
- the three transistors are alternatively each formed as a multi-finger transistor.
- a transistor may thus comprise a plurality of source regions connected in parallel and a plurality of drain regions connected in parallel. Thus, a low on-resistance can be achieved.
- the transistor arrangement comprises the first, the second and the third transistor, of which the first transistor is of the first conductivity type and the second transistor of the second conductivity type.
- the first, the second and the third transistor are each designed as a multi-finger transistor.
- the first, the second and the third transistor each comprise a first and a second transistor connection and a control connection.
- the transistor arrangement comprises the first and the second terminal, the first terminal having the respective first transistor terminals of the three transistors and the second terminal having the respectively second transistor terminal. terminals of the transistors are connected.
- the on-resistance of the three transistors can thus be further reduced.
- the first transistor has a first number of fingers
- the second transistor has a second number of fingers
- the third transistor has a third number of fingers.
- the first, the second and / or the third number of fingers can have at least the value five.
- the number of fingers may be at least 50.
- the number of fingers may be greater than 100.
- the first, the second and / or the third number of fingers may be greater than 200.
- the number of p-doped semiconductor regions results in the case of a p-channel field effect transistor, the number of fingers.
- the number of fingers includes the source and drain regions of the p-channel field effect transistor.
- the number of fingers is the number of n-doped semiconductor regions. The number thus includes the source and the drain regions of the n-channel field effect transistor.
- the semiconductor body can be realized by means of a single-well technique.
- An n-doped well, in English n-well, is preferably provided, in which the p-channel MOSFET is arranged.
- the n-channel MOSFETs are arranged in the substrate of the semiconductor body.
- the semiconductor body has a double well, English twin-well.
- the n-channel MOSFET are arranged in a p-doped and the p-channel MOSFETs in an n-doped well.
- the semiconductor body comprises at least one further transistor, which is connected in parallel to the first, the second and the third transistor.
- one conductivity type of the at least one further transistor is provided in such a way and the at least one further transistor is arranged on the semiconductor body such that exclusively one or more transistors of the second conductivity type are arranged directly adjacent to a transistor of the first conductivity type. Likewise, only transistors of the first conductivity type are arranged immediately adjacent to a transistor of the second conductivity type. Thus, it is avoided that transistors of the same conductivity type are placed next to each other.
- the sum of the current driving capabilities of the first conductivity type transistors is the sum of the current driving capabilities of the second conductivity type transistors and the current driving capability of the second transistor, respectively.
- the sum of the inverse of the on resistances of the transistors of the first conductivity type corresponds to a reciprocal of a turn-on resistance of the second transistor and a sum of inverse of the turn-on resistances of the transistors of the second conductivity type.
- the transistors are each realized as low-impedance transistors.
- the transistor arrangement described can be used as an analog switch.
- the arrangement can be used as a transmission gate.
- the switch can be used bidirectionally.
- a method for designing a transistor arrangement comprises the following steps: a first area A third surface of a second transistor and a third surface of a third transistor on a semiconductor body are dimensioned in dependence on a predetermined parameter of the transistor arrangement with the three transistors.
- the three transistors are connected in parallel with their controlled paths.
- the first transistor has a first and the second transistor has a second conductivity type.
- the first, second, and third transistors each include first and second transistor terminals.
- the method includes designing a first and a second terminal of the transistor arrangement. The first terminal is connected to the respective first transistor terminals of the three transistors. The second terminal is connected to the respective second transistor terminals of the three transistors. In this case, an imaginary connecting line runs from the first connection through the first, the second and the third transistor to the second connection.
- FIGS. 1A to 1D show exemplary embodiments of a transistor arrangement with three transistors according to the proposed principle
- FIG. 2 shows an exemplary embodiment of a transistor arrangement with six transistors according to the proposed principle
- FIG. 3 shows an exemplary embodiment of an transistor arrangement with eight transistors according to the proposed principle
- FIGS. 4A and 4B show exemplary embodiments of a transistor
- Figure 5 shows another exemplary embodiment of a transistor arrangement with three transistors according to the proposed principle
- FIGS. 6A to 6C show exemplary embodiments of a surface of a transistor.
- FIG. 1A shows an exemplary embodiment of a transistor arrangement according to the proposed principle.
- the transistor arrangement comprises a first and a second terminal 1, 2 as well as a first, a second and a third transistor 10, 20, 30.
- the second transistor 20 is arranged between the first transistor 10 and the third transistor 30.
- the first transistor 10 includes a first one
- the first surface 15 has a first side length Sl and a second side length S2.
- the second transistor 20 includes a second area 25 and the third transistor 30 includes a third surface 35.
- the second surface 25 has a third side length S3 and a fourth side length S4.
- the third surface 35 has a fifth side length S5 and a sixth side length S6.
- the first side length Sl, the third side length S3 and the fifth side length S5 are approximately equal.
- the three surfaces 15, 25, 35 are approximately formed as rectangles.
- the three surfaces 15, 25, 35 are arranged relative to one another such that the sides with the same side length are arranged approximately parallel to one another.
- the second surface 25 is disposed between the first surface 15 and the third surface 35.
- a side having the first side length Sl of the first surface 15 is adjacent to a side having the third side length S3 of the second surface 25.
- Another side of the second surface 25 having the third side length S3 is adjacent to a side having the fifth side length S5 of the third Surface 35.
- the first, second and third surfaces 15, 25, 35 are arranged such that their sides are adjacent to the same side length.
- the first and third transistors 10, 30 have a first conductivity type LT1 and the second transistor has a second conductivity type LT2.
- the first conductivity type LT1 is p-type and the second conductivity type LT2 is n-type.
- the sum of the second side length S2 and the sixth side length S6 is greater than the fourth side length S4.
- the sum of the value of the first area 15 and the value of the third area 35 is greater than the value of the second area 25.
- the first terminal 1 is adjacent to the first transistor 10 and the second terminal 2 is adjacent to the third transistor 30 disposed on the semiconductor body 5. In this case, the first terminal 1 is arranged adjacent to a side of the first surface 15, which has the first side length Sl and does not directly adjoin the second surface 25.
- the second terminal 2 is disposed on a side of the third surface 35, which is not immediately adjacent to the second surface 25 and which approximately has the first side length Sl.
- An imaginary connecting line 8 extends from the first port 1 to the second port 2.
- the mental connecting straight line 8 passes through the first, the second and the third transistor 10, 20, 30.
- the mental connecting straight line 8 passes through the first, second and third Surface 15, 25, 35.
- the total area for the first and the third transistor 10, 30 is greater than the second area 25 of the second transistor 20.
- a semiconductor body 5 which comprises, for example, silicon, germanium or gallium arsenide, the lower mobility of holes compared with the mobility of electrons.
- this achieves the result that an on-resistance of a parallel circuit of the first and third transistors 10, 30 is approximately the same as a on-resistance of the second transistor 20.
- the first and second terminals 1, 2 are arranged on the outer sides of the first and third surfaces 15, 35 with the first side length Sl.
- This is adjustable by selecting the value for the first side length Sl of the on resistance of the transistor arrangement. If a lower on-resistance compared to the on-resistance is to be realized in a present design of the transistor arrangement, the first side length becomes Sl and thus the first, the second and the third surface 15, 25, 35 increases. This enlargement can be performed without changing the position of the first and the second terminal 1, 2 or the value of the second, the fourth and the sixth side length S2, S4, S6.
- the fluctuation range of the on-resistance is advantageously changed only slightly by increasing the first side length Sl.
- the first conductivity type is n-type and the second conductivity type is p-type.
- Figure IB shows an exemplary embodiment of a transistor arrangement according to the proposed principle, which represents a development of the arrangement according to FIG IA.
- the first transistor 10 has a first and a second transistor connection 11, 12 of a controlled path and a control connection 13.
- the second transistor 20 has a first and a second transistor connection 21, 22 of a controlled path and a control connection 23.
- the third transistor 30 likewise has a first and a second transistor connection 31, 32 of a controlled path and a control connection 33.
- the respective first transistor connections 11, 21, 31 are directly connected to the first connection 1 and the respectively second transistor connections 12, 22, 32 of the three transistors 10, 20, 30 are connected directly to the second connection 2.
- the semiconductor body 5 comprises a third terminal 3, which is coupled to the three control terminals 13, 23, 33 of the three transistors 10, 20, 30.
- the semiconductor body 5 furthermore has an inverter 4.
- An input of the inverter 4 is connected to the third terminal 3.
- On off- Gang of the inverter 4 is connected to the control terminals 13, 33 of the first and third transistors 10, 30.
- the inverter 4 includes an n-channel MOSFET and a p-channel MOSFET connected in series with each other.
- the control terminal 23 of the second transistor 20 is connected directly to the third terminal 3.
- the three transistors 10, 20, 30 are each formed as a MOSFET.
- the three MOSFETs are self-locking.
- the first and third transistors 10, 30 are each realized as a p-channel MOSFET, abbreviated PMOS, and the second transistor 20 as an n-channel MOSFET, abbreviated NMOS.
- the on-resistance of the second transistor 20 is approximately equal to the on-resistance of the parallel circuit of the first and the third transistor 10, 30, the sum of the width-to-length ratio Wl / Ll of the first transistor 10 and the width -to-length ratio W3 / L3 of the third transistor 30 to be greater than the width-to-length ratio W2 / L2 of the second transistor 20.
- the sum of the first surface 15 and the third surface 35 is greater than the second Area 25.
- a total width (W1 + W3) of the two p-channel MOSFETs together is larger than the width W2 of the n-channel MOSFET, thereby compensating for the higher mobility of the electrons compared to the mobility of the holes.
- a current driving capability of the second transistor 20 corresponds to the sum of the current driving capabilities of the first and third transistors 10, 30.
- a control voltage VC is applied to the third terminal 3 and controls the connection of a first voltage Vl, which is applied to the first terminal 1, to the second terminal 2, at which a second voltage V2 can be tapped off.
- the control voltage VC is supplied to the control terminal 23 of the second transistor 20.
- an inverted control voltage VCI is generated, which is the control terminals 13, 33 of the first and the third transistor 10, 30 is supplied.
- the value of the first voltage Vl approximately corresponds to the value of the second voltage V2 even with a high current flow between the first and the second connection 1, 2.
- the inverter 4 connects the third terminal 3 to the control terminal 23 of the second transistor 20.
- the control terminals 13, 33 of the first and third transistors 10, 30 are connected directly to the third terminal 3.
- the first, the second and / or the third terminal 1, 2, 3 each have a connection surface.
- the pads can be bondable.
- Figure IC shows an exemplary embodiment of the transistor arrangement according to the proposed principle, which represents a development of the arrangements according to Figures IA and IB.
- Figure IC shows an exemplary embodiment of the transistor arrangement according to the proposed principle, which represents a development of the arrangements according to Figures IA and IB.
- the transistor symbols shown in FIG. 1B and the connection of FIG. 1B are shown in FIG. 1B and the connection of FIG. 1B.
- the second side length S2 is approximately equal to the sixth side length S6.
- the first surface 15 and the third surface 35 are about the same size.
- the three surfaces 15, 25, 35 are arranged symmetrically with respect to a first axis of symmetry 6 on the semiconductor body 5.
- the first and third surfaces 15, 35 are symmetrical with each other with respect to the first Symmetry axis 6.
- the second surface 25 is symmetrical in itself to the first axis of symmetry 6.
- the first axis of symmetry 6 thus intersects the second surface 25 on the half of the two sides with the fourth side length S4.
- the first symmetry axis 6 thus intersects the second surface 25 in two
- Part surfaces 27, 27 ' The partial surfaces 27, 27 'have the same dimensions.
- the first and the second connection 1, 2 are arranged symmetrically with respect to the three transistors 10, 20, 30 or symmetrically with respect to the three surfaces 15, 25, 35.
- the first and second terminals 1, 2 are symmetrical with respect to the first axis of symmetry 6 to each other.
- the transistor arrangement has a second axis of symmetry 7, which is perpendicular to the first axis of symmetry 6.
- the second symmetry axis 7 extends through the first and the second connection 1, 2.
- the first and the second connection 1, 2 are each symmetrical in relation to the second axis of symmetry 7.
- the second axis of symmetry 7 intersects the first surface 15 in two partial surfaces 16, 16 '.
- the partial surfaces 16, 16 ' have the same dimensions.
- the second symmetry axis 7 intersects the second surface 25 in two partial surfaces 26, 26 'and the third surface 35 in two partial surfaces 36, 36'.
- the partial surfaces 26, 26 ' have the same dimensions.
- the partial surfaces 36, 36 ' have the same dimensions.
- the conceptual connecting line 8 corresponds to the second axis of symmetry 7. As shown in FIG. 1A, the conceptual connecting line extending from the first to the second connection 1, 2 passes through the first, the second and the third transistor 10, 20, 30.
- a uniform current distribution is achieved by means of the symmetry. As a result, a uniform temperature distribution is achieved.
- a uniform current distribution also leads to a uniform voltage drop on the lines in the three surfaces 15, 25, 35 and thus to an overall lower on-resistance.
- the transistor arrangement advantageously has a low total area.
- a switch-on and switch-off of the switch are low.
- the uniform temperature distribution and the small area of the transistor arrangement result in a low leakage current value.
- an ESD protection circuit provided in one embodiment, which is designed for the first terminal 1, can also be provided for the second terminal 2.
- the transistor arrangement is advantageously easily scalable. Measurement or simulation values which are obtained for two transistor arrangements having different first side lengths Sl allow simple conclusions to be drawn about characteristic parameters of a transistor arrangement with a further value for the first side length Sl. This reduces the design effort of integrated transistors.
- a design of a transistor arrangement having a higher on-resistance can be obtained from a design of a transistor arrangement having a lower on resistance by applying a plurality of manufacturing masks, including a mask for the definition of the source and drain regions, unchanged and only one or a few masks including a metallization mask, to be changed. With the latter mask, for example, the width-to-length ratios of the three transistors 10, 20, 30 are adjustable.
- the on-resistance is composed inter alia of the resistance of the metallic interconnects, the contact resistance between the interconnects and the semiconductor and the resistance of the actual switch, namely the channel between the source and drain regions of the MOSFETs together.
- the sum of the resistance of the tracks and the contact resistance may be greater than the channel resistance.
- the transistor arrangement is advantageously designed such that the interconnect and contact resistances are kept small and uniformly distributed to the second transistor 20 on the one hand and the first and the third transistor 10, 30 on the other hand.
- the dependencies of the various resistance contributions on the first side length S1 can be determined and advantageously used for further designs of an analog switch.
- FIG. 1D shows a further exemplary embodiment of a transistor arrangement with three transistors according to the proposed principle.
- the transistor arrangement represents a development of the arrangements according to FIGS. 1A to 1C.
- the first and the third transistor 10, 30 are each realized as p-channel MOSFETs.
- the second transistor 20 is shown as n Channel MOSFET formed.
- the second, the fourth and the sixth side lengths S2, S4, S6 in FIG. ID are approximately the same length.
- the first, second and third surfaces 15, 25, 35 are each the same size.
- the transistor symbols shown in FIG. 1B and the first, second and third terminals 1, 2, 3 as well as the connections are not shown.
- the first axis of symmetry 6 extends through the second surface 25 of the second transistor 20.
- the axis of symmetry 6 is parallel to the two sides of the second surface 25 having the third side length S3.
- the second axis of symmetry 7 is perpendicular to the first axis of symmetry 6.
- the second axis of symmetry 7 extends through the first, the second and the third surface 15, 25, 35.
- the first surface 15 is symmetrical in itself with respect to the second axis of symmetry 7.
- the second and third surfaces 25, 35 in each case symmetrically to the second axis of symmetry. 7
- the current flowing between the first and second terminals 1, 2 is distributed as uniformly as possible to the three transistors 10, 20, 30 or the three surfaces 15, 25, 35.
- An on-resistance of the first, second and third transistors 10, 20, 30 is thus distributed over the entire area of the first, second and third surfaces 15, 25, 35. Due to the uniform distribution, the transistor arrangement is less susceptible to damage in the case of an electrostatic discharge since the charge applied thereto is divided equally between all areas of the transistor arrangement. Due to the symmetry properties, a lead resistance for all regions of the three transistors 10, 20, 30 is approximately equal.
- the transistor arrangement is designed as a transmission gate with a low on resistance.
- FIG. 2 shows an exemplary embodiment of a transistor arrangement with six transistors according to the proposed principle, which is a development of the arrangement according to FIGS.
- the arrangement additionally comprises a fourth, a fifth and a sixth transistor 40, 50, 60 which are connected in parallel with the first, second and third transistors 10, 20, 30.
- Transistor 40, 60 have the first conductivity type LTl and a fourth and sixth surface 45, 65, respectively.
- the fifth transistor 50 has the second conductivity type LT2 and a fifth surface 55.
- the transistor arrangement is symmetrical with respect to the first and second symmetry axes 6, 7.
- the imaginary connecting straight line extends from the first to the second connection 1, 2 and runs through the transistors of the transistor arrangement.
- the mental connecting line runs through the first, second, third, fourth, fifth and sixth transistors 10, 20, 30, 40, 50, 60.
- the mental connecting line passes through the surfaces 15, 25, 35, 45, 55, 65 ,
- the degrees of freedom in the design of the transistor arrangement are further increased by the addition of the fourth, fifth and sixth transistors 40, 50, 60.
- the electric power converted per unit area may be larger in the second and fifth transistors 20, 50 than in the first, third, fourth and sixth transistors 10, 30, 40, 60.
- further transistors are arranged between the third and fourth transistors 30, 40.
- FIG. 3 shows a further exemplary embodiment of a transistor arrangement with eight transistors according to the proposed principle, which is a further development of the arrangements according to FIGS. 1A to 1D and 2.
- the transistor arrangement comprises the first, second, third and fifth transistors 10, 20, 30, 50.
- the transistor arrangement has a seventh to tenth transistor 110, 120, 130, 150.
- the first, third, seventh and ninth transistors 10, 30, 110, 130 are of the first conductivity type LTl and the second, fifth, eighth and tenth transistors 20, 50, 120, 150 of the second conductivity type LT2.
- the eight transistors are connected in parallel between the first and second terminals 1, 2. Parallel connection means that the respective controlled path of the eight transistors is connected between the first connection 1 and the second connection 2.
- FIG. 4A shows an exemplary embodiment of a transistor according to the proposed principle.
- the transistor according to FIG. 4A can be used as one of the transistors in the transistor arrangements according to FIGS. 1A to 1D, 2 and 3.
- the first transistor 10 is shown.
- the first transistor 10 is realized as a multi-finger transistor.
- the first transistor 10 has a first number Nl of fingers.
- the first transistor 10 comprises a first, a second, a third and a fourth semiconductor region 70 to 73.
- the four semiconductor regions 70 to 73 are p-doped. In the plan view shown in FIG. 4A, the four semiconductor regions 70 to 73 have approximately the same area and are formed as rectangles. One side of the respective rectangles has the first side length Sl.
- the first and third semiconductor regions 70, 72 are formed as drain regions.
- the second and fourth semiconductor regions 71, 73 are realized as source regions. Between the first and the second semiconductor region 70, 71 there is a first channel region 74.
- a second or a third channel region 75, 76 is located between the second and the third semiconductor region 71, 72 as well as between the third and the fourth semiconductor region 72, 73
- the first number Nl of fingers thus comprises the four semiconductor regions 70 to 73.
- the first channel region 74 is covered by a first control electrode 77, English gate electrode. Accordingly, the second and third channel regions 75, 76 are covered by a second and a third control electrode 78, 79.
- the first surface 15 of the first transistor 10 thus comprises the first number Nl of fingers and thus the first number Nl of The number of channel regions 74, 75, 76 is thus Nl - 1.
- the first surface 15 is formed as a rectangle and has the first and the second side length Sl, S2 ,
- the first transistor 10 is symmetrical with respect to the second axis of symmetry 7.
- the second axis of symmetry 7 is orthogonal to the longer side of the individual semiconductor regions 70 to 73.
- the second symmetry axis 7 is orthogonal to the side of the four semiconductor regions 70 to 73 which are the first side length Sl has.
- the second symmetry axis 7 intersects the first number N 1 of the fingers of the first transistor 10.
- the second symmetry axis 7 is approximately parallel to a drain-source current ID S, that of the first one
- the arrows parallel to the second axis of symmetry 7 indicate that the first number N 1 of fingers can have a value greater than four.
- the longer sides of the four sides of the rectangle of the first semiconductor region 70, which have the value of the first side length Sl, are arranged parallel to the first axis of symmetry 6.
- the first and the third semiconductor region 70, 72 are formed as source regions and the second and the fourth semiconductor region 71, 73 as drain regions.
- FIG 4B shows an exemplary embodiment of a transistor according to the proposed principle, which is a development of the transistor shown in Figure 4A.
- the first terminal 1 is connected to the first and the third semiconductor area 70, 72 connected.
- the first transistor connection 11 thus comprises the first and the third semiconductor regions 70 and 72.
- the drain regions are connected to the first connection 1.
- the second and fourth semiconductor regions 71 and 73 are connected to the second terminal 2.
- the second transistor terminal 12 therefore has the second and the fourth semiconductor regions 71 and 73.
- the source regions are connected to the second terminal 2.
- the first, second and third control electrodes 77, 78, 79 are coupled to the third terminal 3.
- the control terminal 13 thus comprises the three control electrodes 77, 78, 79.
- the first surface 15 is delimited by a closed line, which includes the first number N 1 of semiconductor regions 70 to 73 and the intermediate channel regions 74 to 76.
- FIG. 5 shows an exemplary transistor arrangement according to the proposed principle.
- the arrangement according to Figure 5 is a development of the embodiments shown in Figures IA to ID and 4A and 4B.
- the first, second and third transistors 10, 20, 30 are each designed as multi-finger transistors.
- the second transistor 20 has a second number N2 and the third transistor 30 has a third number N3 of fingers.
- the first, second and third numbers Nl, N2, N3 have at least the value of three.
- the first number Nl and the third number N3 have the value three in the exemplary embodiment according to FIG. 5, and the second number N2 has the value five.
- the first and third semiconductor regions 70, 72 are connected to the first terminal 1 by means of a conductor 97.
- the second semiconductor region 71 is connected by means of another conductor track 98 connected to the second port 2.
- the first and second control electrodes 77, 78 of the first transistor 10 are coupled to the third terminal 3 via the inverter 4.
- the second surface 25 of the second transistor 20 is realized as a rectangle.
- the second surface 25 comprises further semiconductor regions 80, 81, 82, 83 and further channel regions 84, 85, 86.
- the four semiconductor regions 80 to 83 are n-doped and are separated from one another by means of the three channel regions 84, 85, 86.
- the three channel regions 84, 85, 86 are covered by three control electrodes 87, 88, 89.
- the semiconductor regions 80, 82 are connected to the first terminal 1 by means of the conductor 97.
- the semiconductor regions 81, 83 are connected to the second terminal 2 by means of the further conductor track 98.
- the control electrodes 87, 88, 89 of the second transistor 20 are connected to the third terminal 3.
- the three control electrodes 87 to 89 are connected directly to the third terminal 3.
- the third area 35 of the third transistor 30 is implemented as a rectangle.
- the third surface 35 comprises further semiconductor regions 90, 91, 92 as well as further channel regions 93, 94.
- the semiconductor regions 90, 91, 92 are p-doped.
- the semiconductor regions 90, 92 are connected to the second terminal 2.
- the semiconductor region 91 is connected to the first terminal 1.
- the semiconductor region 91 lies between the semiconductor region 90 and the semiconductor region 92.
- the two channel regions 93, 94 are covered by two control electrodes 95, 96, which are coupled to the third connection 3 via the inverter 4.
- the conceptual connecting straight line extends from the first to the second connection 1, 2 and runs through the first, the second and the second connection the third transistor 10, 20, 30 or through their surfaces 15, 25, 35th
- the first and the second connection 1, 2 and the connections from the first and the second connection 1, 2 to the semiconductor regions are symmetrical with respect to the first and the second axis of symmetry 6, 7.
- the regions and areas carrying a high current are advantageously realized symmetrically with respect to the two axes of symmetry 6, 7. Since only a small current, which serves to charge and discharge the control electrodes, flows via the third terminal 3 and via the inverter 4, the third terminal 3 can be arranged asymmetrically with respect to one of the axes of symmetry 6, 7.
- the third number N3 is equal to the first number N1
- the first and third transistors 10, 30 have approximately the same current driving capability.
- the value of the sixth side length S6 is thus approximately equal to the value of the second side length S2.
- the sum of the first and third numbers Nl + N3 is greater than the second number N2. The higher mobility of the electrons which carry the current flowing in the second transistor 20 compensates for the mobility of the holes which carry the current flowing in the first and in the third transistor 10, 30.
- the sum of the current driving capabilities of the first and third transistors 10, 30 corresponds to the current driving capability of the second transistor 20
- the first, the third and the fifth side length Sl, S3, S5 have approximately the same value.
- An on-resistance of the first transistor 10 can be adjusted by selecting the first side length Sl and the first number Nl. By increasing the value of the first side length Sl and / or increasing the value of the first number Nl, a turn-on resistance of the first transistor 10 is lowered. Accordingly, a turn-on resistance of the second transistor 20 through the third side length S3 and the second number N2 and a turn-on resistance of the third transistor 30 can be set by the fifth side length S5 and by the third number N3.
- the transistor arrangement can thus be scaled in one direction parallel to the first axis of symmetry 6, that is to say be increased or decreased.
- the transistor arrangement is designed as a transmission gate.
- the first, third and fifth side lengths S1, S3, S5 can be increased.
- the on-resistance of the transmission gate can also be reduced by increasing the transistor arrangement in the direction parallel to the second axis of symmetry 7.
- the value of the first number N1 and thus the value of the second side length S2 the value of the second number N2 and thus the value of the fourth side length S4 and / or the value of the third number N3 and thus the value of the sixth page length S6 be increased.
- the inverter 4 is connected between the third terminal 3 and the control electrodes 87, 88, 89 of the second transistor 20.
- the control electrodes of the first and third transistors 10, 30 are connected directly to the third terminal 3.
- Figure 6A shows an exemplary embodiment of the surface of the first transistor 10.
- the first surface 15 is formed as a rectangle.
- FIG. 6B shows a further exemplary embodiment of the surface of the first transistor.
- the first surface 15 ' is realized as an octagon.
- the first surface 15 'thus has eight corners.
- the first surface 15 ' has the first, the second and another side length Sl, S2, S2'.
- FIG. 6C shows a further exemplary embodiment of the first surface of the first transistor.
- the first surface 15 '' is formed as a hexagon.
- the first surface 15 "thus has six corners.
- An angle of each of the six corners is 60 degrees.
- the second, third and further transistors 20, 30 may also have areas as shown in FIGS. 6A to 6C. LIST OF REFERENCE NUMBERS
Abstract
Description
Claims
Priority Applications (1)
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DE112007002630.8T DE112007002630B4 (en) | 2006-11-10 | 2007-11-09 | Transistor arrangement and method for its design |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE200610053084 DE102006053084A1 (en) | 2006-11-10 | 2006-11-10 | Transistor arrangement and method for its design |
DE102006053084.5 | 2006-11-10 |
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WO2008055987A1 true WO2008055987A1 (en) | 2008-05-15 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2007/062169 WO2008055987A1 (en) | 2006-11-10 | 2007-11-09 | Transistor arrangement for an analog switch, and method for designing the same |
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DE (2) | DE102006053084A1 (en) |
WO (1) | WO2008055987A1 (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4695866A (en) * | 1983-09-28 | 1987-09-22 | Nec Corporation | Semiconductor integrated circuit device |
US5332916A (en) * | 1991-09-30 | 1994-07-26 | Rohm Co., Ltd. | Transmission gate |
US5532509A (en) * | 1994-12-16 | 1996-07-02 | Motorola, Inc. | Semiconductor inverter layout having improved electromigration characteristics in the output node |
US20020053941A1 (en) * | 1997-04-24 | 2002-05-09 | Hiroshi Shigehara | Transmission gate |
US20040203196A1 (en) * | 2003-04-09 | 2004-10-14 | Kabushiki Kaisha Toshiba | Semiconductor integrated circuit |
US20050230751A1 (en) * | 2004-04-16 | 2005-10-20 | Masako Ohta | Semiconductor device |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3813586A (en) * | 1973-03-07 | 1974-05-28 | Us Navy | Matched pair of enhancement mode mos transistors |
JPS5894232A (en) * | 1981-11-30 | 1983-06-04 | Toshiba Corp | Semiconductor analog switch circuit |
JPS6446979A (en) * | 1987-08-14 | 1989-02-21 | Oki Electric Ind Co Ltd | Analogue switch and sample-and-hold circuit with analogue switch |
US5111072A (en) * | 1990-08-29 | 1992-05-05 | Ncr Corporation | Sample-and-hold switch with low on resistance and reduced charge injection |
JP4931308B2 (en) * | 2001-09-28 | 2012-05-16 | ルネサスエレクトロニクス株式会社 | Semiconductor integrated circuit device |
-
2006
- 2006-11-10 DE DE200610053084 patent/DE102006053084A1/en not_active Withdrawn
-
2007
- 2007-11-09 DE DE112007002630.8T patent/DE112007002630B4/en not_active Expired - Fee Related
- 2007-11-09 WO PCT/EP2007/062169 patent/WO2008055987A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4695866A (en) * | 1983-09-28 | 1987-09-22 | Nec Corporation | Semiconductor integrated circuit device |
US5332916A (en) * | 1991-09-30 | 1994-07-26 | Rohm Co., Ltd. | Transmission gate |
US5532509A (en) * | 1994-12-16 | 1996-07-02 | Motorola, Inc. | Semiconductor inverter layout having improved electromigration characteristics in the output node |
US20020053941A1 (en) * | 1997-04-24 | 2002-05-09 | Hiroshi Shigehara | Transmission gate |
US20040203196A1 (en) * | 2003-04-09 | 2004-10-14 | Kabushiki Kaisha Toshiba | Semiconductor integrated circuit |
US20050230751A1 (en) * | 2004-04-16 | 2005-10-20 | Masako Ohta | Semiconductor device |
Also Published As
Publication number | Publication date |
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DE102006053084A1 (en) | 2008-05-21 |
DE112007002630B4 (en) | 2016-09-15 |
DE112007002630A5 (en) | 2009-09-17 |
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