WO2014098273A1 - 고속 입출력 패드를 위한 바이어스 전압 생성 회로 - Google Patents
고속 입출력 패드를 위한 바이어스 전압 생성 회로 Download PDFInfo
- Publication number
- WO2014098273A1 WO2014098273A1 PCT/KR2012/011020 KR2012011020W WO2014098273A1 WO 2014098273 A1 WO2014098273 A1 WO 2014098273A1 KR 2012011020 W KR2012011020 W KR 2012011020W WO 2014098273 A1 WO2014098273 A1 WO 2014098273A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- bias
- power source
- bias voltage
- switching element
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/003—Modifications for increasing the reliability for protection
- H03K19/00346—Modifications for eliminating interference or parasitic voltages or currents
- H03K19/00361—Modifications for eliminating interference or parasitic voltages or currents in field effect transistor circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018507—Interface arrangements
Definitions
- the present disclosure relates to a bias voltage generation circuit for a high speed input / output pad. More specifically, the present invention relates to a bias circuit for protecting an input / output buffer circuit from an input / output voltage having a high input / output pad.
- the input / output buffer circuit is a circuit for exchanging signals between chips and chips, and has various forms depending on the system.
- the voltage level may be higher than the power supply voltage used inside the chip.
- I / O circuits with a fail-safe function are described in the case where there is a situation in which only one chip (or a chip requiring fail-safe operation) is not applied to the system, i.e., the I / O buffer circuit has no power supply. This is an input / output circuit in case the circuit does not work.
- FIG. 1 is a circuit diagram illustrating a digital input / output circuit having a fail-safe function of a general general scheme.
- an input / output circuit may include an IO driver block 20 for outputting an IO voltage, an ESD protection circuit 30, and a bias generator block 10 for fail-safe operation.
- Transistors constituting the input / output circuit may be used at a voltage of 2V or less in the process, and the input / output voltage is assumed to be 3.3V.
- the bias1 voltage is equal to or lower than 2V, which is the allowable value of the voltage applied to Mnb1. It may be necessary to make the first bias voltage at half level.
- the second bias voltage Bis2 may be biased to 3.3 V such as a pad to prevent the current from flowing through Mpb1 in the reverse direction to the VDDPST along with the voltage tolerance.
- the NWBIAS may require 3.3V, which is a voltage equal to the pad PAD, to prevent the junction diode between the drain terminal and the bulk or the body of the Mpb1 from being turned on.
- an intermediate voltage may be generated by using a diode in series as in the bias1 generator 10 of FIG. 1.
- the first bias voltage may always maintain about 0.5 * PAD voltage, resulting in a stable first bias voltage.
- the diode-type voltage distribution method used here consumes a constant current from the pad to generate a bias required for fail-safe operation, so that the current is limited to a certain level or less.
- Generating a bias with a small current generally requires a certain amount of time to generate a bias in an I / O circuit with a large load due to the large size of a transistor constituting a circuit such as an electrostatic discharge (ESD). It may cause the speed limit.
- ESD electrostatic discharge
- FIG. 2 is a conceptual diagram illustrating the influence of parasitic capacitor components in a general bias generation circuit.
- Drivers and ESD circuits in the circuit may use a transistor having a large width for the purpose of driving a large current and may have a large parasitic capacitor.
- a high frequency path by the parasitic capacitor may be made from the pad to the first bias node.
- the voltage of the first bias bias1 may be 2V or more, which is the voltage tolerance of the transistor.
- the diode used in general is difficult to make a variety of voltages because the threshold voltage is large as 800mV, this threshold voltage may vary, depending on the process may be difficult to limit the stable voltage.
- An object of the present disclosure is to provide a bias voltage generation circuit for a high speed input / output pad.
- a bias voltage generator for achieving the above objects is a bias voltage generator for supplying at least one bias voltage to a buffer circuit connected to the pad PAD, the first of the at least one bias voltage A bias generator which generates a bias voltage; And a reference voltage generator configured to generate a voltage proportional to a pad voltage applied to the pad as a reference voltage, wherein the first bias voltage is a voltage obtained by adding a set voltage to the reference voltage.
- the bias generator includes a first resistor and a first switching element, and the first resistor is connected between the pad and a first output node for outputting the first bias voltage.
- the first switching element may be connected between the first output node and the ground node, and the reference voltage may be applied to a gate terminal of the first switching element.
- the first switching device may be a p-type MOS transistor, and the set voltage may be a threshold voltage corresponding to the first switching device.
- the reference voltage generator may generate the reference voltage based on a voltage distribution between the pad voltage and the ground voltage corresponding to the ground node.
- the reference voltage generator may include a second resistor and a third resistor, and the voltage distribution may be based on the second resistor and the third resistor.
- the second resistor is connected between the pad and the reference node
- the third resistor is connected between the reference node and the ground node, wherein the reference voltage is the reference node. It may be a voltage corresponding to.
- the buffer circuit may include a pull-up switching device, a pull-down switching device, and an N-type bias transistor connected between the pull-up switching device and the pull-down switching device.
- the pad may be connected to a contact node between the pull-up switching element and the N-type bias transistor, and the first bias voltage may be applied to a gate terminal of the N-type bias transistor.
- the bias voltage generator is configured to receive a voltage corresponding to the first power source when the first power source and the second power source are applied and both the first power source and the second power source are activated. If the first bias voltage and the first power supply and the second power supply are not activated, the first bias voltage is output as a voltage obtained by adding the set voltage to the reference voltage, and corresponds to the second power supply. The voltage may be greater than the voltage corresponding to the first power source.
- the voltage corresponding to the first power source may be 1.8V
- the voltage corresponding to the second power source may be 3.3V.
- the bias generation unit may further include a second switching element, wherein a source terminal of the second switching element is applied with the first power, and a gate terminal of the second switching element is The second power is applied, and the drain terminal of the second switching element may be connected to a node that outputs the first bias.
- the reference voltage generator generates a voltage corresponding to the first power as a reference voltage when both of the first power and the second power are activated, and the first power and the power supply.
- a voltage proportional to the pad voltage applied to the pad may be generated as a reference voltage.
- the reference voltage generator further includes a third switching element, wherein a source terminal of the third switching element is applied with the first power, and a gate terminal of the third switching element is The second power is applied, and the drain terminal of the third switching device may be connected to a node that outputs the reference voltage.
- the bias generator generates a second bias voltage, wherein the second bias voltage corresponds to the second power source when both the first power source and the second power source are activated.
- the voltage and the first power supply and the second power supply are not activated, it may be the same voltage as the first bias voltage.
- a fourth switching element and a fifth switching element and generating a third bias voltage of the at least one bias voltage, wherein both the first power source and the second power source are activated
- the fifth switching element may be turned on based on the second bias voltage to generate a pad voltage applied to the pad as the third bias voltage.
- the method further includes a sixth switching element and a seventh switching element, and generates an N-well bias voltage among the at least one bias voltage, wherein both the first power source and the second power source are activated.
- the sixth switching element is turned on based on the third bias voltage to generate a voltage corresponding to the second power supply as the N-well bias voltage, and the first power supply and the second power supply are When neither of them is activated, the seventh switching element may be turned on based on the second bias voltage to generate a pad voltage applied to the pad as the N-well bias voltage.
- the buffer circuit may include a P-type bias transistor and an N-type bias transistor connected between a pull-up switching device, a pull-down switching device, and the pull-up switching device and a pull-down switching device.
- a source terminal of the P-type bias transistor is connected to a drain terminal of the pull-up switching element
- a source terminal of the N-type bias transistor is connected to a drain terminal of the pull-down switching element
- the pad is connected to a contact node between the P-type bias transistor and the N-type bias transistor, wherein the first bias voltage is applied to a gate terminal of the N-type bias transistor, and the third bias voltage is the P-type. Is applied to a gate terminal of a bias transistor, and the N-well bias voltage is applied to the P-type bias transistor. It may be connected to the body terminal of the register.
- a bias voltage generator for a high speed input / output pad is provided.
- a high-speed signal is added by adding a circuit that stably limits the bias voltage provided to the buffer circuit in a short time in a fail-safe mode in which power is not applied.
- FIG. 1 is a circuit diagram illustrating a digital input / output circuit having a fail-safe function of a general general scheme.
- FIG. 2 is a conceptual diagram illustrating the influence of parasitic capacitor components in a general bias generation circuit.
- FIG. 3 is a block diagram illustrating a configuration of an input / output (I / O) circuit according to an embodiment disclosed in the present specification.
- FIG. 4 is a configuration diagram illustrating a configuration of a bias voltage generator according to one embodiment disclosed herein.
- FIG. 5 is a circuit diagram illustrating a bias voltage generator according to an embodiment disclosed herein.
- FIG. 6 is a circuit diagram illustrating a buffer circuit according to an exemplary embodiment disclosed herein.
- FIG. 7 is an exemplary diagram illustrating a bias voltage generator according to a first embodiment disclosed herein.
- FIG. 8 is a circuit diagram illustrating a bias voltage generator according to a second embodiment disclosed herein.
- FIG. 9 is an exemplary view illustrating a bias voltage generator according to a third embodiment disclosed herein.
- FIG. 10 is a circuit diagram illustrating a buffer circuit according to a third embodiment disclosed herein.
- FIG. 11 shows an overall circuit diagram of a bias voltage generator according to a fourth embodiment disclosed herein.
- FIG. 12 shows a buffer circuit 200 using bias voltages generated by a bias voltage generator according to the fourth embodiment disclosed herein.
- 13 is a circuit diagram showing the operation of the bias voltage generator and the buffer circuit in the normal mode.
- FIG. 14 is a circuit diagram illustrating an operation of a bias voltage generator and a buffer circuit in a first fail-safe mode.
- FIG. 15 is a circuit diagram showing the operation of the bias voltage generator and the buffer circuit in the case of the second fail-safe mode2.
- 16 is an exemplary view showing a simulation result of the bias voltages for each operation mode.
- the technique disclosed herein can be applied to a bias voltage generation circuit for a high speed input / output pad.
- the technology disclosed herein is not limited thereto, and may be used in all voltage generation circuits and voltage generation methods to which the technical spirit of the technology may be applied.
- first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
- first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
- an input / output circuit having a fail-safe function may include a bias circuit that protects the input / output buffer circuit from high input / output voltage on the input / output pad when there is no power supply inside the chip.
- This bias circuit can generate a stable bias using a pad as a power supply and supply it to an input / output transistor to be protected even when there is no power supply so that a voltage above a predetermined level is not applied to the transistors used in the input / output circuit.
- the present invention proposes a technique for solving this problem and a method of implementing the same.
- bias voltage generator or generation circuit
- FIG. 3 is a block diagram illustrating a configuration of an input / output (I / O) circuit according to an embodiment disclosed in the present specification.
- an input / output circuit may include a bias voltage generator 100 and a buffer circuit 200.
- the sag bias voltage generator 100 may supply at least one bias voltage to the buffer circuit 200.
- the buffer circuit 200 may be a circuit generally used in the art.
- the buffer circuit 200 may output data through the pad to the outside based on the at least one bias voltage and the pull-up signal or the pull-down signal.
- FIG. 4 is a configuration diagram illustrating a configuration of a bias voltage generator according to one embodiment disclosed herein.
- the bias voltage generator 100 may include a bias generator 110 and a reference voltage generator 120.
- the bias voltage generator 100 may serve to supply at least one bias voltage to a buffer circuit connected to the pad PAD.
- the bias generator 110 may serve to generate a first bias voltage among the at least one bias voltage.
- the reference voltage generator 120 may generate a voltage proportional to the pad voltage applied to the pad as the reference voltage VR100.
- the first bias voltage may be a voltage obtained by adding a set voltage to the reference voltage VR100.
- the bias generator 110 and the reference voltage generator 120 may be configured in various ways (or shapes). That is, the bias generator 110 and the reference voltage generator 120 may be formed in various configurations using various passive elements or active elements.
- FIG. 5 is a circuit diagram illustrating a bias voltage generator according to an embodiment disclosed herein.
- the bias generator 110 may include a first resistor R1 and a first switching element M1.
- the first resistor R1 may be connected between the pad P100 and the first output node nb1 that outputs the first bias voltage bias1.
- the first switching device M1 may be connected between the first output node nb1 and the ground node g100.
- the voltage corresponding to the ground node g100 may be expressed in terms generally used in the art.
- the voltage corresponding to the ground node g100 may be expressed as 'VSS'.
- the reference voltage VR100 may be applied to the gate terminal of the first switching element M1.
- the first switching device M1 may be a p-type MOS transistor (see FIG. 5). All switching devices described below may mean at least one of a p-type MOS transistor and an n-type MOS transistor. In addition, it will be apparent to those skilled in the art that various kinds of switching elements (or transistors) may be used in the bias voltage generator 100 according to one embodiment disclosed herein.
- the set voltage may be generated (or used) in various ways.
- the set voltage may be a threshold voltage corresponding to the first switching element M1.
- the reference voltage generator 120 may generate the reference voltage VR100 based on a voltage distribution between a voltage corresponding to the pad P100 and a ground voltage corresponding to the ground node g100.
- the reference voltage generator 120 may include a second resistor R2 and a third resistor R3, and the voltage divider may include the second resistor R2 and the third resistor. It may be made based on (R3).
- the second resistor R2 is connected between the pad P100 and the reference node nr1
- the third resistor R3 is connected to the reference node nr1 and the ground node g100.
- the reference voltage VR100 may be a voltage corresponding to the reference node nr1.
- the reference voltage VR100 may be '0.3 * pad voltage'.
- the first bias voltage may be a voltage obtained by adding a set voltage to '0.3 * pad voltage' which is the reference voltage.
- the set voltage is a threshold voltage (or threshold voltage) corresponding to the first switching element M1.
- the reference voltage generator (or R2, R3 voltage divider circuit, 120) to make a '0.3 * pad voltage'
- the gate voltage of the first switching device M1 may be made.
- the first bias voltage corresponding to the drain node of the first switching element M1 is '0.3 * pad voltage', which is a gate voltage of the first switching element M1 in a circuit configuration.
- the first switching device M1 may be turned on and limited to a specific voltage value (a kind of clamp function).
- the first bias voltage may be limited to a voltage value obtained by adding a set voltage (for example, the threshold voltage of the first switching element M1, Vth) to 0.3 * pad voltage (' 0.3 * pad voltage + Vth (M1) ', hereinafter referred to as design voltage).
- the design voltage when the pad voltage is 3.3V and the threshold voltage of the first switching element M1 which is the set voltage is 0.6V, the design voltage may be 1.7V (1.1V + 0.6V). In addition, for example, when the threshold voltage is 0.7V, the design voltage may be 1.8V.
- the first bias voltage waveform may be the first voltage waveform V100, but the limit is not limited. If there is a function may be the second voltage waveform (V200).
- the source node of the first switching element M1 used for discharging uses a global node as a ground node (for example, a node corresponding to VSS), there is an advantage that rapid discharging is possible. Can be.
- the voltage level of the first bias bias1 is a design voltage value (for example, '0.3 * pad voltage + Vth (M1)') by the voltage divider circuit (or reference voltage generator) 120 of R2-R3. Can be determined.
- This method has the advantage of making a voltage level insensitive to process changes because it uses a MOS transistor (TR) with a smaller process variation and a smaller threshold voltage than a method using a diode. have.
- TR MOS transistor
- the voltage divider circuit of the resistors R2 and R3 used in this circuit uses the ratio of the resistors, so that a mismatch can be ignored.
- FIG. 6 is a circuit diagram illustrating a buffer circuit according to an exemplary embodiment disclosed herein.
- a buffer circuit 200 may include a pull-up switching device Mpu, a pull-down switching device Mdn, the pull-up switching device Mpu, and It may include an N-type bias transistor (Mbias1) connected between the pull-down switching device (Mdn).
- Mbias1 N-type bias transistor
- the pad P100 is connected to a contact node between the pull-up switching element Mpu and the N-type bias transistor Mbias, and the first bias voltage bias1 is the N-type bias transistor Mbias1. It may be applied to the gate terminal of.
- a pad resistor Rp may exist between the buffer circuit 200 and the pad P100.
- an ESD circuit EC100 may be connected to the pad P100.
- the first embodiment disclosed herein may be embodied in some or a combination of configurations or steps included in the above-described embodiments, or may be implemented in a combination of the embodiments, and the following provides a clear representation of the first embodiment disclosed herein. Duplicate parts can be omitted.
- the bias voltage generator for supplying at least one bias voltage to the buffer circuit connected to the pad (PAD), the first bias voltage of the at least one bias voltage; And a reference voltage generator configured to generate a voltage proportional to a pad voltage applied to the pad as a reference voltage, wherein the first bias voltage is a voltage obtained by adding a set voltage to the reference voltage.
- the bias voltage generator when the first power source and the second power source is applied, and both the first power source and the second power source is activated, the voltage corresponding to the first power source;
- a voltage obtained by adding the set voltage to the reference voltage may be output as the first bias voltage.
- the voltage corresponding to the second power source may be greater than the voltage corresponding to the first power source.
- the voltage corresponding to the first power source may be 1.8V
- the voltage corresponding to the second power source may be 3.3V.
- the bias generation unit further includes a second switching element, the source terminal of the second switching element, the first power is applied, the gate terminal of the second switching element The second power is applied, and the drain terminal of the second switching device may be connected to a node that outputs the first bias.
- the reference voltage generator when both the first power source and the second power source are activated, the reference voltage generator generates a voltage corresponding to the first power source as a reference voltage, and both the first power source and the second power source are both.
- the reference voltage When not activated, the reference voltage may be a voltage proportional to the pad voltage applied to the pad.
- the reference voltage generator further includes a third switching element, wherein the source terminal of the third switching element is supplied with the first power and the gate of the third switching element.
- the terminal may be the second power source, and the drain terminal of the third switching element may be connected to a node that outputs the reference voltage.
- FIG. 7 is an exemplary diagram illustrating a bias voltage generator according to a first embodiment disclosed herein.
- the bias voltage generator 100 ′ may include a bias generator 110 ′ and a reference voltage generator 120 ′.
- the bias generation unit 110 ′ further includes a second switching element M2, and a source of the second switching element M2 is supplied with a first power source VDD18.
- the second power supply VDD33 is applied to the gate terminal of the second switching element M2, and the drain terminal of the second switching element M2 outputs a first bias bias1. Can be connected to.
- the voltage corresponding to the first power source VDD18 may be 1.8V, and the voltage corresponding to the second power source VDD33 may be 3.3V.
- the bias generator 110 ′ may have a voltage corresponding to the first power source VDD18.
- 1.8V may be output as the first bias voltage.
- a voltage (design voltage) added with a set voltage to the reference voltage VR100 may be output as the first bias voltage.
- the reference voltage generator 120 ′ selects a voltage corresponding to the first power source VDD18 as a reference voltage.
- a voltage proportional to the pad voltage applied to the pad may be generated as the reference voltage VR100.
- the reference voltage generator 120 ′ further includes a third switching element M3, wherein the source terminal of the third switching element M3 is the first power source ( VDD18 is applied, the gate terminal of the third switching element M3 is applied with the second power supply VDD33, and the drain terminal of the third switching element M3 is a node that outputs the reference voltage. (Or a reference node, nr1).
- the technique disclosed herein relates to a bias voltage generation circuit (or bias voltage generator) for biasing to operate (or move) quickly in response to a high speed input / output signal.
- the first bias bias1 of the bias generation circuit disclosed in the present specification may be a voltage when the first power supply VDD18 and the second power supply VDD33 do not have 1.8 V and 3.3 V power, respectively, from the input pad PAD, or any voltage. If not, the first bias Bias1 is generated with a specific bias (or design voltage). On the contrary, when both supply voltages exist, the bias voltage is set to a specific power supply (for example, the first power source-1.8. By connecting to V), it can play a role of making a specific voltage (or design voltage) to protect the input / output (I / O) circuit even when there is no power supply.
- the bias generation circuit according to the first embodiment disclosed herein may be configured to rapidly limit the first bias voltage to a specific level (or a specific voltage) and simultaneously with the second switching element M2 and the third. Used together with the switching element M3 may have a switching function that can be turned on and off the operation of the biasing circuit according to the state of a particular power supply.
- the semiconductor chip including the bias generation circuit uses a power supply of 1.8V and 3.3V (eg, VDD18 and VDD33)
- the VDD18 and VDD33 may be used.
- the second switching device M2 may be turned on in a state where all powers corresponding to the power supply are supplied, and the voltage corresponding to the reference node nr1 may be fixed at 1.8V.
- the third switching device M3 may connect a voltage corresponding to the first bias node nb1 with a 1.8V power supply.
- the first bias voltage has a voltage of 1.8 V when all of the power is turned on, and a leakage current can be prevented from flowing to the first switching element M1.
- a leakage current (i.e., a node corresponding to the ground node g100 or VSS) from the pad is applied. leakage current flows, and this value is determined by the value of the resistor, so it is possible to reduce leakage by increasing the value of the resistance.
- the second embodiment disclosed herein may be embodied in some or a combination of configurations or steps included in the above-described embodiments, or may be implemented in a combination of embodiments.
- a clear representation of the first embodiment disclosed herein will be described. Duplicate parts can be omitted.
- the bias voltage generator for supplying at least one bias voltage to the buffer circuit connected to the pad (PAD), the first bias voltage of the at least one bias voltage And a reference voltage generator configured to generate a voltage proportional to a pad voltage applied to the pad as a reference voltage, wherein the first bias voltage is a voltage obtained by adding a set voltage to the reference voltage.
- the bias voltage generator when the first power source and the second power source is applied, and both the first power source and the second power source is activated, the voltage corresponding to the first power source; Outputting the first bias voltage and outputting a voltage obtained by adding the set voltage to the reference voltage as the first bias voltage when both the first power source and the second power source are not activated.
- the corresponding voltage may be greater than the voltage corresponding to the first power source.
- the bias generator generates a second bias voltage, wherein the second bias voltage corresponds to the second power source when both the first power source and the second power source are activated.
- the voltage may be the same as the first bias voltage.
- FIG. 8 is a circuit diagram illustrating a bias voltage generator according to a second embodiment disclosed herein.
- the bias voltage generator 100 ′′ may further include a second bias transistor M4 and a fourth resistor R4 in the circuit disclosed in FIG. 7. have.
- the second bias transistor M4 may be a p-type MOS transistor.
- the second bias transistor M4 when both of the first power source VDD18 and the second power source VDD33 are activated, the second bias transistor M4 is turned on and the second bias is turned on.
- the bias voltage may be a voltage (for example, 3, 3V) corresponding to the second power supply VDD33.
- the voltage corresponding to the first power source VDD18 is equal to 1.8V. This may be because the second bias transistor M4 is turned on.
- the second bias voltage when neither the first power source nor the second power source is activated, the second bias voltage may be the same voltage as the first bias voltage.
- the second bias voltage may be equal to the first bias voltage based on the fourth resistor R4.
- the third embodiment disclosed herein may be embodied in some or a combination of configurations or steps included in the above-described embodiments, or may be implemented in a combination of embodiments, and the following clearly describes the third embodiment disclosed herein. Duplicate parts can be omitted.
- a first bias voltage of the at least one bias voltage may be changed.
- a reference voltage generator configured to generate a voltage proportional to a pad voltage applied to the pad as a reference voltage, wherein the first bias voltage is a voltage obtained by adding a set voltage to the reference voltage.
- the bias voltage generator when the first power source and the second power source is applied, and both the first power source and the second power source is activated, the voltage corresponding to the first power source; Outputting the first bias voltage and outputting a voltage obtained by adding the set voltage to the reference voltage as the first bias voltage when both the first power source and the second power source are not activated.
- the corresponding voltage may be greater than the voltage corresponding to the first power source.
- the bias generation unit generates a second bias voltage, wherein the second bias voltage corresponds to the second power source when both the first power source and the second power source are activated.
- the voltage may be the same as the first bias voltage.
- a fourth switching element and a fifth switching element are included, and generate a third bias voltage of the at least one bias voltage, wherein both the first power source and the second power source are activated.
- the fifth switching element may be turned on based on the second bias voltage to generate a pad voltage applied to the pad as the third bias voltage.
- the third embodiment further comprising a sixth switching element and a seventh switching element, and generates an N-well bias voltage of the at least one bias voltage, wherein the first power supply and the second power supply are both When activated, the sixth switching element is turned on based on the first bias voltage to generate a voltage corresponding to the second power supply as the N-well bias voltage, and the first power supply and the second power supply. When neither of these is activated, the seventh switching element may be turned on based on the second bias voltage to generate the third bias voltage as the N-well bias voltage.
- the buffer circuit comprises a pull-up switching element, a pull-down switching element and a P-type bias transistor and an N-type bias connected between the pull-up switching element and the pull-down switching element.
- a transistor wherein a source terminal of the P-type bias transistor is connected to a drain terminal of the pull-up switching element, and a source terminal of the N-type bias transistor is connected to a drain terminal of the pull-down switching element;
- the pad is connected to a contact node between the P-type bias transistor and the N-type bias transistor, wherein the first bias voltage is applied to the gate terminal of the N-type bias transistor, and the third bias voltage is the P Is applied to a gate terminal of a type bias transistor, and the N-well bias voltage is applied to the P-type bias transistor; It may be connected to the body terminal of the requester.
- FIG. 9 is an exemplary view illustrating a bias voltage generator according to a third embodiment disclosed herein.
- the bias voltage generator 100 ′ ′′ according to the third embodiment disclosed herein may further include the circuit configuration disclosed in FIG. 9 in addition to the configuration disclosed in FIG. 8.
- the bias voltage generator 100 ′ ′′ may further include a fourth switching element MP1 and a fifth switching element MP3.
- the bias voltage generator 100 ′ ′′ includes the first bias voltage, the second bias voltage, the fourth switching element MP1 and the fifth switching element ( Based on MP2), a third bias voltage among the at least one bias voltage provided to the buffer circuit may be further generated.
- the second bias voltage is based on the second bias voltage.
- the fourth switching device MP1 may be turned on to generate the first bias voltage as the third bias voltage.
- the fifth switching element MP2 is turned on based on the second bias voltage so that the pad is turned on.
- the pad voltage applied to (P100) may be generated as the third bias voltage.
- the bias voltage generator 100 ′′ ′ may include a sixth switching element MP6 and a seventh switching element MP3.
- the bias voltage generator 100 ′ ′′ includes the first bias voltage, the second bias voltage, the sixth switching element MP6, and the seventh switching element MP3.
- the N-well bias (NWBIAS) voltage among at least one bias voltage provided to the buffer circuit may be further generated.
- the third bias voltage 3 is performed.
- the sixth switching element MP6 is turned on so that the voltage corresponding to the second power source VDD33 (for example, 3.3V) is the N-well bias. It can be generated by the voltage NWBIAS.
- the second bias voltage (for example, 1.8 V, which is a design voltage of the first bias voltage) may be changed.
- the seventh switching element MP3 may be turned on to generate the pad voltage (or the third bias voltage) applied to the pad P100 as the N-well bias voltage NWBIAS.
- the NWBIAS may be for preventing the junction of the drain and bulk (or body) junction diodes from turning on.
- the transistor M6 may serve to fix the drain voltage of the MP4 to the first bias voltage when all of the power is applied.
- FIG. 10 is a circuit diagram illustrating a buffer circuit according to a third embodiment disclosed herein.
- a buffer circuit 200 ′ may include a pull-up switching device (MPU), a pull-down switching device (MDN), and the pull-up switching device (MPU). ), A P-type bias transistor Mbias3 and an N-type bias transistor Mbias1 connected between the pull-down switching device MDN.
- MPU pull-up switching device
- MDN pull-down switching device
- MPU pull-up switching device
- the source terminal of the P-type bias transistor Mbias3 is connected to the drain terminal of the pull-up switching device MPU, and the source terminal of the N-type bias transistor Mbias1 is the pull-down switching device. It may be connected to the drain terminal of the (MDN).
- the pad P100 is connected to a contact node between the P-type bias transistor Mbias3 and the N-type bias transistor Mbias1, and the first bias voltage is a gate of the N-type bias transistor Mbias1. Can be applied to the terminal.
- the third bias voltage 3 is applied to the gate terminal of the P-type bias transistor Mbias3, and the N-well bias voltage NWBIAS is the body terminal of the P-type bias transistor Mbias3. Or a bulk terminal).
- the fourth embodiment disclosed herein may be embodied in some or a combination of configurations or steps included in the above-described embodiments, or may be implemented in a combination of embodiments, and the following clearly describes the fourth embodiment disclosed herein. Duplicate parts can be omitted.
- FIG. 11 shows an overall circuit diagram of a bias voltage generator according to a fourth embodiment disclosed herein.
- a portion for generating the first bias voltage and the second bias voltage according to the second embodiment corresponds to a circuit connected to the bottom of the pad P100, and the third bias and N ⁇ according to the third embodiment.
- the part generating the well bias voltage may correspond to a circuit connected to the top of the pad P100.
- the first bias voltage has a voltage (for example, 1.8V) corresponding to the first power supply in a state where there is a power supply, and is equal to a voltage corresponding to the pad P100 in a state where there is no power.
- the voltage level can be maintained.
- the voltage corresponding to the pad P100 may be fixed at a specific voltage level (eg, '0.3 * pad voltage + Vth (M1)', which is a design voltage).
- the second bias (Bias2) voltage may be the same voltage as the first bias1 voltage when the power is not applied, and when the power is present, the IO voltage (for example, 3.3, which is a voltage corresponding to the second power supply).
- the IO voltage for example, 3.3, which is a voltage corresponding to the second power supply.
- the third bias voltage Bias3 follows the voltage corresponding to the pad P100 without limitation, and when there is a power supply, the voltage corresponding to the first power supply (for example, 1.8V). ) Can be maintained.
- the NWBIAS can take on the same voltage as the third bias voltage when there is no power supply and maintain the highest power supply (eg, 3.3 V, the voltage corresponding to the second power supply) when power is applied and pull-up It is possible to prevent reverse leakage current that may occur in a pull up path driver TR (eg, p-type MOS transistors present in the pull-up path of FIG. 12 below).
- TR pull up path driver TR
- FIG. 12 shows a buffer circuit 200 using bias voltages generated by a bias voltage generator according to the fourth embodiment disclosed herein.
- an input / output (I / O) signal level through the pad P100 may be 0V / 3.3V, and an allowable voltage (or device margin voltage) of each transistor TR may be 2V.
- the output driver (or buffer circuit 200) may be divided into a pull-up path LPU100 and a pull-down path LDN100 as shown in FIG. 12.
- fail-safe mode it consists of a switch (eg, TG200) that can properly open / short the PU signal to prevent leakage from flowing into the pull-up path.
- a switch eg, TG200
- the bias generator 100 can create a total of four biases (first bias, second bias, third bias and NWBIAS). have.
- the first transmission gate TG100 existing in the pull-up path may serve to activate the pull-up path according to whether power is applied.
- the second transmission gate TG200 pull-ups an abnormal voltage (or current) of the pad in a fail-safe mode in which at least one of the first power source and the second power source is not applied. It can serve to prevent propagation along the path.
- the second transmission gate TG200 may be driven by the second power supply VDD33 and the transmission gating circuit CR100.
- the switching device SWP1 maintains the gate voltage of the pull-up switching device (MPU) at the first bias voltage (eg, 1.8V, which is a design voltage) in the fail-safe mode, thereby overvoltage (eg, 2V, which is a device margin). It can play a role of preventing over).
- the first bias voltage eg, 1.8V, which is a design voltage
- overvoltage eg, 2V, which is a device margin
- the switching device SWP2 may serve to maintain the drain voltage of the P-type bias transistor Mbias3 as the first bias voltage (eg, 1.8V, which is a design voltage) in the fail-safe mode.
- the first bias voltage eg, 1.8V, which is a design voltage
- the operation mode described below is a normal mode in which both the first power source VDD18 and the second power source VDD33 are applied, the first power source VDD18 is applied, and the second power source VDD33 is applied. ) Is the first fail-safe mode 1 to which no safe power is applied and the second fail-safe mode 2 to which neither the first power source VDD18 nor the second power source VDD33 is applied. ) May be included.
- a voltage corresponding to the first power source VDD18 is 1.8V
- a voltage corresponding to the second power source VDD33 is 3.3V
- the design voltage is 1.8V (first switching) for convenience of description. Assume that the case where the threshold voltage of the element M1 is 0.7V).
- 13 is a circuit diagram showing the operation of the bias voltage generator and the buffer circuit in the normal mode.
- NWBIAS is generated at 3.3V
- any voltage of 0 to 3.3V is generated on the pad of the right driver circuit (or buffer circuit) 200 of FIG. 13, and overstress (or overvoltage) is greater than 2V on the transistors connected to the pad. Can be suppressed from occurring.
- the TG200 may be turned on to be connected to deliver a data signal generated according to data in the pre driver to the driver.
- FIG. 14 is a circuit diagram illustrating an operation of a bias voltage generator and a buffer circuit in a first fail-safe mode.
- VDD33 or the second power supply
- VDD18 or the first power supply
- the buffer circuit cannot perform normal operation of inputting / outputting data. Since the power supply of the VDD33 is 0V, the power supply is all applied when the pad voltage is applied at 3.3V. You may have to fail safe as well.
- the switching devices (switches) connected to the VDD18, VDD33 are all turned off and may be a mode for generating a voltage dependent on the pad (PAD).
- the bias1 node may not have a voltage greater than 1.8V (for example, the design voltage) by the pmos (for example, M1) performing the clamp operation.
- bias2 which is required to generate bias3 and NWBIAS, can be clamped at 1.8V or higher like bias1.
- bias2 can be used for the circuit that creates bias3 and NWBIAS on top of the bias generator.
- the reverse voltage is prevented from being generated between the pad and the NWBIAS, thereby preventing the junction diode of the bulk and channel of the PMOS from turning on.
- FIG. 15 is a circuit diagram showing the operation of the bias voltage generator and the buffer circuit in the case of the second fail-safe mode2.
- both VDD33 and VDD18 operate at the second fail-safe mode at 0V, and the operation is similar to that of FIG. 14, and thus a detailed description thereof will be omitted.
- 16 is an exemplary view showing a simulation result of the bias voltages for each operation mode.
- waveforms of four bias voltages VBIAS1, VBIAS2, VBIAS3, and NWBIAS for each of a first fail-safe mode, a second fail-safe mode, and a normal mode may be checked.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Semiconductor Integrated Circuits (AREA)
- Logic Circuits (AREA)
Abstract
Description
Claims (16)
- 패드(PAD)에 연결되는 버퍼 회로에 적어도 하나의 바이어스(bias) 전압을 공급하는 바이어스 전압 생성기에 있어서,상기 적어도 하나의 바이어스 전압 중 제 1 바이어스 전압을 생성하는 바이어스 생성부; 및상기 패드에 인가되는 패드 전압에 비례하는 전압을 기준 전압으로 생성하는 기준 전압 생성부를 포함하되,상기 제 1 바이어스 전압은,상기 기준 전압에 설정 전압이 더해진 전압인 것인 바이어스 전압 생성기.
- 제1항에 있어서, 상기 바이어스 생성부는,제 1 저항, 제 1 스위칭 소자를 포함하고,상기 제 1 저항은,상기 패드 및 상기 제 1 바이어스 전압을 출력하는 제 1 출력 노드 사이에 연결되고,상기 제 1 스위칭 소자는,상기 제 1 출력 노드 및 접지 노드 사이에 연결되고,상기 기준 전압은,상기 제 1 스위칭 소자의 게이트 단자에 인가되는 것인 바이어스 전압 생성기.
- 제2항에 있어서, 상기 제 1 스위칭 소자는,p형 MOS 트랜지스터이고,상기 설정 전압은,상기 제 1 스위칭 소자에 해당하는 임계 전압(threshold voltage)인 것인 바이어스 전압 생성기.
- 제1항에 있어서, 상기 기준 전압 생성부는,상기 패드 전압 및 접지 노드에 해당하는 접지 전압 간의 전압 분배를 근거로 상기 기준 전압을 생성하는 것인 바이어스 전압 생성기.
- 제4항에 있어서, 상기 기준 전압 생성부는,제 2 저항 및 제 3 저항을 포함하고,상기 전압 분배는,상기 제 2 저항 및 상기 제 3 저항을 근거로 이루어지는 것인 바이어스 전압 생성기.
- 제5항에 있어서, 상기 제 2 저항은,상기 패드 및 기준 노드 사이에 연결되고,상기 제 3 저항은,상기 기준 노드 및 상기 접지 노드 사이에 연결되되,상기 기준 전압은,상기 기준 노드에 해당하는 전압인 것인 바이어스 전압 생성기.
- 제1항에 있어서, 상기 버퍼 회로는,풀-업 스위칭 소자, 풀-다운 스위칭 소자 및 상기 풀-업 스위칭 소자 및 풀-다운 스위칭 소자 사이에 연결되는 N형 바이어스 트랜지스터를 포함하고,상기 패드는 상기 풀-업 스위칭 소자 및 상기 N형 바이어스 트랜지스터 간의 접점 노드에 연결되고,상기 제 1 바이어스 전압은,상기 N형 바이어스 트랜지스터의 게이트 단자에 인가되는 것인 바이어스 전압 생성기.
- 제1항에 있어서, 상기 바이어스 전압 생성기는,제 1 전원 및 제 2 전원을 인가 받고,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화된 경우,상기 제 1 전원에 해당하는 전압을 상기 제 1 바이어스 전압으로 출력하고,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화되지 않은 경우,상기 기준 전압에 상기 설정 전압이 더해진 전압을 상기 제 1 바이어스 전압으로 출력하되,상기 제 2 전원에 해당하는 전압은 상기 제 1 전원에 해당하는 전압보다 큰 것인 바이어스 전압 생성기.
- 제8항에 있어서, 상기 제 1 전원에 해당하는 전압은,1.8V이고,상기 제 2 전원에 해당하는 전압은,3.3V인 것인 바이어스 전압 생성기.
- 제8항에 있어서, 상기 바이어스 생성부는,제 2 스위칭 소자를 더 포함하되,상기 제 2 스위칭 소자의 소스 단자는,상기 제 1 전원이 인가되고,상기 제 2 스위칭 소자의 게이트 단자는,상기 제 2 전원이 인가되고,상기 제 2 스위칭 소자의 드레인 단자는,상기 제 1 바이어스를 출력하는 노드에 연결되는 것인 바이어스 전압 생성기.
- 제8항에 있어서, 상기 기준 전압 생성부는,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화된 경우,상기 제 1 전원에 해당하는 전압을 기준 전압으로 생성하고,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화되지 않은 경우,상기 패드에 인가되는 패드 전압에 비례하는 전압을 기준 전압으로 생성하는 것인 바이어스 전압 생성기.
- 제11항에 있어서, 상기 기준 전압 생성부는,제 3 스위칭 소자를 더 포함하되,상기 제 3 스위칭 소자의 소스 단자는,상기 제 1 전원이 인가되고,상기 제 3 스위칭 소자의 게이트 단자는,상기 제 2 전원이 인가되고,상기 제 3 스위칭 소자의 드레인 단자는,상기 기준 전압을 출력하는 노드에 연결되는 것인 바이어스 전압 생성기.
- 제8항에 있어서, 상기 바이어스 생성부는,제 2 바이어스 전압을 생성하되,상기 제 2 바이어스 전압은,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화된 경우,상기 제 2 전원에 해당하는 전압이 되고,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화되지 않은 경우,상기 제 1 바이어스 전압과 동일한 전압이 되는 것인 바이어스 전압 생성기.
- 제13항에 있어서,제 4 스위칭 소자 및 제 5 스위칭 소자를 포함하고,상기 적어도 하나의 바이어스 전압 중 제 3 바이어스 전압을 생성하되,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화된 경우,상기 제 2 바이어스 전압을 근거로 상기 제 4 스위칭 소자가 턴-온되어 상기 제 1 바이어스 전압이 상기 제 3 바이어스 전압으로 생성되고,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화되지 않은 경우,상기 제 2 바이어스 전압을 근거로 상기 제 5 스위칭 소자가 턴-온되어 상기 패드에 인가되는 패드 전압이 상기 제 3 바이어스 전압으로 생성되는 것인 바이어스 전압 생성기.
- 제14항에 있어서,제 6 스위칭 소자 및 제 7 스위칭 소자를 더 포함하고,상기 적어도 하나의 바이어스 전압 중 N-웰 바이어스 전압을 생성하되,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화된 경우,상기 제 3 바이어스 전압을 근거로 상기 제 6 스위칭 소자가 턴-온되어 상기 제 2 전원에 해당하는 전압이 상기 N-웰 바이어스 전압으로 생성되고,상기 제 1 전원 및 상기 제 2 전원이 모두 활성화되지 않은 경우,상기 제 2 바이어스 전압을 근거로 상기 제 7 스위칭 소자가 턴-온되어 상기 패드에 인가되는 패드 전압이 상기 N-웰 바이어스 전압으로 생성되는 것인 바이어스 전압 생성기.
- 제15항에 있어서, 상기 버퍼 회로는,풀-업 스위칭 소자, 풀-다운 스위칭 소자 및 상기 풀-업 스위칭 소자, 풀-다운 스위칭 소자 사이에 연결되는 P형 바이어스 트랜지스터 및 N형 바이어스 트랜지스터를 포함하고,상기 P형 바이어스 트랜지스터의 소스 단자는,상기 풀-업 스위칭 소자의 드레인 단자와 연결되고,상기 N형 바이어스 트랜지스터의 소스 단자는,상기 풀-다운 스위칭 소자의 드레인 단자와 연결되고,상기 패드는 상기 P형 바이어스 트랜지스터 및 상기 N형 바이어스 트랜지스터 간의 접점 노드에 연결되되,상기 제 1 바이어스 전압은,상기 N형 바이어스 트랜지스터의 게이트 단자에 인가되고,상기 제 3 바이어스 전압은,상기 P형 바이어스 트랜지스터의 게이트 단자에 인가되고,상기 N-웰 바이어스 전압은,상기 P형 바이어스 트랜지스터의 바디 단자에 연결되는 것인 바이어스 전압 생성기.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/KR2012/011020 WO2014098273A1 (ko) | 2012-12-17 | 2012-12-17 | 고속 입출력 패드를 위한 바이어스 전압 생성 회로 |
US14/653,112 US9425793B2 (en) | 2012-12-17 | 2012-12-17 | Circuit for generating bias voltage for high speed input/output pad |
KR1020157018353A KR101740397B1 (ko) | 2012-12-17 | 2012-12-17 | 고속 입출력 패드를 위한 바이어스 전압 생성 회로 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/KR2012/011020 WO2014098273A1 (ko) | 2012-12-17 | 2012-12-17 | 고속 입출력 패드를 위한 바이어스 전압 생성 회로 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2014098273A1 true WO2014098273A1 (ko) | 2014-06-26 |
Family
ID=50978570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2012/011020 WO2014098273A1 (ko) | 2012-12-17 | 2012-12-17 | 고속 입출력 패드를 위한 바이어스 전압 생성 회로 |
Country Status (3)
Country | Link |
---|---|
US (1) | US9425793B2 (ko) |
KR (1) | KR101740397B1 (ko) |
WO (1) | WO2014098273A1 (ko) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102320544B1 (ko) * | 2015-07-10 | 2021-11-03 | 에스케이하이닉스 주식회사 | 레벨 쉬프터 |
TWI690157B (zh) * | 2019-05-21 | 2020-04-01 | 智原科技股份有限公司 | 輸入輸出電路及其自偏壓電路 |
US11355927B2 (en) * | 2020-07-22 | 2022-06-07 | Taiwan Semiconductor Manufacturing Co., Ltd. | Device and method for operating the same |
US11289472B2 (en) * | 2020-07-30 | 2022-03-29 | Taiwan Semiconductor Manufacturing Co., Ltd. | Integrated circuit with electrostatic discharge protection |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008042996A (ja) * | 2006-08-02 | 2008-02-21 | Tamura Seisakusho Co Ltd | 保護回路およびスイッチング電源装置 |
JP2008134687A (ja) * | 2006-11-27 | 2008-06-12 | Rohm Co Ltd | 電圧生成回路 |
KR20090126812A (ko) * | 2008-06-05 | 2009-12-09 | 삼성전자주식회사 | 기준 전압 발생 장치 및 방법 |
US20100148797A1 (en) * | 2008-12-14 | 2010-06-17 | Ming-Dou Ker | Esd detection circuit and related method thereof |
US20120049939A1 (en) * | 2009-06-02 | 2012-03-01 | Panasonic Corporation | Input/output circuit |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3802239B2 (ja) * | 1998-08-17 | 2006-07-26 | 株式会社東芝 | 半導体集積回路 |
JP2002526934A (ja) * | 1998-09-25 | 2002-08-20 | インフィネオン テヒノロギーズ アーゲー | 集積回路の保護回路 |
JP5318676B2 (ja) * | 2009-06-25 | 2013-10-16 | ルネサスエレクトロニクス株式会社 | 半導体装置 |
-
2012
- 2012-12-17 KR KR1020157018353A patent/KR101740397B1/ko active IP Right Grant
- 2012-12-17 WO PCT/KR2012/011020 patent/WO2014098273A1/ko active Application Filing
- 2012-12-17 US US14/653,112 patent/US9425793B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008042996A (ja) * | 2006-08-02 | 2008-02-21 | Tamura Seisakusho Co Ltd | 保護回路およびスイッチング電源装置 |
JP2008134687A (ja) * | 2006-11-27 | 2008-06-12 | Rohm Co Ltd | 電圧生成回路 |
KR20090126812A (ko) * | 2008-06-05 | 2009-12-09 | 삼성전자주식회사 | 기준 전압 발생 장치 및 방법 |
US20100148797A1 (en) * | 2008-12-14 | 2010-06-17 | Ming-Dou Ker | Esd detection circuit and related method thereof |
US20120049939A1 (en) * | 2009-06-02 | 2012-03-01 | Panasonic Corporation | Input/output circuit |
Also Published As
Publication number | Publication date |
---|---|
US20150326224A1 (en) | 2015-11-12 |
US9425793B2 (en) | 2016-08-23 |
KR101740397B1 (ko) | 2017-05-26 |
KR20150115731A (ko) | 2015-10-14 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN108155636B (zh) | 有源接口电阻调制开关 | |
WO2014098273A1 (ko) | 고속 입출력 패드를 위한 바이어스 전압 생성 회로 | |
US7286003B2 (en) | On-chip voltage regulator | |
US7511550B2 (en) | Method and apparatus for improving reliability of an integrated circuit having multiple power domains | |
US20140092508A1 (en) | Clamping circuit, a semiconductor apparatus including the same, and a clamping method of the semiconductor apparatus | |
KR100206870B1 (ko) | 정전 방전 및 래치 업 방지회로 | |
US5229635A (en) | ESD protection circuit and method for power-down application | |
WO2012173408A2 (ko) | 파워 릴레이 어셈블리 구동 장치 및 그 구동 방법 | |
US20080158757A1 (en) | Short circuit and over-voltage protection for a data bus | |
WO2017004849A1 (zh) | 一种扫描驱动电路 | |
US20090058496A1 (en) | Circuit arrangement and corresponding method for controlling and/or preventing injection current | |
WO2021107485A1 (en) | Display apparatus | |
WO2016084995A1 (ko) | 개선된 시간 응답 특성을 가지는 패스 스위치 회로 및 그 제어 방법 | |
US6538867B1 (en) | FET switch with overvoltage protection | |
US11025054B2 (en) | Electrostatic discharge protection device | |
KR20200005861A (ko) | 누설 전류 저감형 고주파 스위치 장치 | |
US8143812B2 (en) | Clamp to enable low voltage switching for high voltage terminal applications | |
KR100744123B1 (ko) | 정전기 방전에 대한 내성을 향상시킨 esd 보호회로 | |
WO2016114415A1 (ko) | 개선된 시간 응답 특성을 가지는 레벨 시프터 회로 및 그 제어 방법 | |
TW201431290A (zh) | 輸出緩衝器 | |
WO2014178591A1 (ko) | 키입력장치 및 이를 포함하는 키보드 | |
WO2012161528A2 (ko) | 엘이디 구동 제어 장치 및 이의 구동 전류 제어 방법 | |
US11190012B2 (en) | Electrostatic protection circuit | |
US10396068B2 (en) | Electrostatic discharge protection device | |
US20140334046A1 (en) | Semiconductor circuit |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12890346 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 14653112 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 20157018353 Country of ref document: KR Kind code of ref document: A |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12890346 Country of ref document: EP Kind code of ref document: A1 |