WO2012165285A1 - ドライバ集積化回路 - Google Patents
ドライバ集積化回路 Download PDFInfo
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- WO2012165285A1 WO2012165285A1 PCT/JP2012/063297 JP2012063297W WO2012165285A1 WO 2012165285 A1 WO2012165285 A1 WO 2012165285A1 JP 2012063297 W JP2012063297 W JP 2012063297W WO 2012165285 A1 WO2012165285 A1 WO 2012165285A1
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- 238000000034 method Methods 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 230000015556 catabolic process Effects 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims description 32
- 230000005855 radiation Effects 0.000 description 14
- 230000017525 heat dissipation Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 238000007689 inspection Methods 0.000 description 9
- 239000004065 semiconductor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010894 electron beam technology Methods 0.000 description 5
- 239000006071 cream Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- -1 back surface pattern Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001878 scanning electron micrograph Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/189—High-frequency amplifiers, e.g. radio frequency amplifiers
- H03F3/19—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only
- H03F3/195—High-frequency amplifiers, e.g. radio frequency amplifiers with semiconductor devices only in integrated circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/211—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only using a combination of several amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
- H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
- H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/30—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor
- H03F3/3001—Single-ended push-pull [SEPP] amplifiers; Phase-splitters therefor with field-effect transistors
- H03F3/3022—CMOS common source output SEPP amplifiers
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- 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
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
- H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/189—Indexing scheme relating to amplifiers the ground, reference or shield potential difference between different chips being controlled
Definitions
- the present invention relates to a driver integrated circuit, for example, a high voltage driver integrated circuit.
- High-speed, high-voltage driver integrated circuits are widely applied in fields such as semiconductor inspection / measurement equipment and medical equipment.
- a semiconductor inspection / measurement apparatus scans and irradiates a wafer to be measured and inspected with an electron beam, generates a measurement or detection image from the generated secondary electrons, and performs measurement and inspection based on the measurement or detection image. It is a device that performs.
- the pattern on the semiconductor wafer is detected at the end of each manufacturing process in order to detect the occurrence of abnormalities and defects in the manufacturing process early or in advance. Measurement and inspection are performed.
- the amount of secondary electrons generated varies depending on the unevenness of the sample, and therefore, it is possible to grasp the shape change of the sample surface by evaluating the secondary electron signal.
- the edge position in the semiconductor circuit pattern SEM image is estimated by utilizing the fact that the secondary electron signal rapidly increases at the edge portion of the pattern, and the dimension is measured.
- the electron beam deflection circuit for controlling the electron beam scan deflects the electron beam accelerated by a voltage of several kV to several tens kV to the inspection / measurement position designated.
- a deflection voltage of several tens to several hundreds V is applied to the deflection plate to control the deflection of the electron beam.
- a high-speed and high-voltage deflection voltage is necessary.
- Patent Document 1 discloses a technique for configuring a circuit without using a high voltage process in a part of the circuit. Specifically, in Patent Document 1, a class D amplifier is realized without using a high voltage process except for the output stage of the circuit.
- Patent Document 1 a high breakdown voltage process is not necessary for some circuit portions other than the output stage, but a high breakdown voltage process is still essential for the circuit of the output stage. Considering the entire circuit, it is not a means that can output a voltage exceeding the breakdown voltage of the process, and is not a basic solution when considering cost reduction and circuit manufacturing shortening.
- high-voltage output driver circuits there are two types: an integrated configuration and a discrete configuration.
- a circuit When a circuit is configured by integration, basically all circuit components are generated on the same chip and packaged as one last component. In this case, the maximum output voltage range of the circuit is determined by the breakdown voltage of the process for manufacturing the chip. If the maximum output voltage required for higher performance of the device cannot satisfy the withstand voltage of the current process, it is necessary to develop a higher withstand voltage process. However, it is not easy to develop a new high pressure resistant process because of the cost and time.
- the present invention has been made in view of such a situation, and can be manufactured in a short period of time and at low cost using the current process, and can output a voltage exceeding the withstand voltage of the process, and required apparatus performance.
- a configuration of a driver integrated circuit satisfying (high speed and high voltage) is provided.
- a driver integrated circuit includes a differential input circuit that amplifies a differential input signal, a level shift circuit that voltage-shifts a signal amplified by the differential input circuit, and And an output circuit that amplifies and outputs the signal that has been voltage-shifted by the level shift circuit. Then, the differential input circuit, the level shift circuit, and the output circuit are divided and configured using three or more chips. Different voltages are applied to the substrates of three or more chips, and an output voltage larger than the process breakdown voltage is output from the output circuit.
- the present invention it is possible to realize a driver integrated circuit capable of saving the cost and time required for the development of a new process and outputting a voltage exceeding the process breakdown voltage.
- FIG. 1 It is a figure which shows schematic structure of a general driver integrated circuit. It is a figure which shows schematic structure of the high voltage
- FIG. 1 is a diagram showing a configuration of a general high voltage output driver integrated circuit.
- the high voltage output driver integrated circuit 130 generally has a differential input circuit 1311, a level shift circuit 1312, and a high voltage output stage circuit 1313.
- V1 a voltage (device drop voltage) that is several V to several tens V higher than Vo.
- the voltage range simultaneously applied to the chip is set to ⁇ 2V1 at the maximum, and the required process breakdown voltage is set to ⁇ 2V2.
- V2 V1 + ⁇ V1
- ⁇ V1 indicates a margin.
- FIG. 2 is a diagram showing a configuration of an improved high voltage driver integrated circuit according to the first embodiment of the present invention. If the circuit configuration of FIG. 2 is employed, the maximum output voltage can be set to ⁇ 2V1 (V1 ⁇ V2) by using a process of withstand voltage ⁇ V2.
- the entire driver circuit is divided into three chips 101, 102, and 103.
- the substrate potential (reference voltage) of each chip is set to a different potential among Vsub1, Vsub2, and Vsub3.
- the potentials of Vsub1, Vsub2, and Vsub3 may be set freely.
- Vsub1 and Vsub3 are symmetrical with respect to Vsub2, and the breakdown voltage of the entire circuit is the highest.
- Each chip is desirably manufactured using the same process.
- the differential input circuit portion (differential input stage portion) 1021 is arranged on one chip 102, and the applied voltage range is set lower than the withstand voltage of the process.
- the voltage range applied to the level shift circuit portion is a maximum of ⁇ 2 V1, which is almost twice the process breakdown voltage ⁇ V2.
- the level shift stage portion is divided into three chips, chip 1_101, chip 2_102, and chip 3_103.
- the circuits belonging to the level shift stage portion are a high voltage portion 1011, an intermediate voltage portion 1022, and a low voltage portion 1031.
- the applied voltage V LS_H for the high voltage portion 1011 arranged in the chip 1_101 is set to a range (applied voltage range) of V1 ⁇ V LS_h ⁇ 2V1.
- the applied voltage V LS_M for the intermediate voltage portion 1022 arranged in the chip 2_102 is set to a range (applied voltage range) of ⁇ V1 ⁇ V LS_m ⁇ V1.
- the applied voltage V LS_L for the low voltage portion 1031 arranged in the chip 3_103 is set in a range (applied voltage range) of ⁇ 2V1 ⁇ V LS_l ⁇ ⁇ V1 .
- the high voltage output circuit unit is also distributed and arranged on three chips. That is, the circuits belonging to the high voltage output circuit portion are the high voltage portion 1012, the intermediate voltage portion 1023, and the low voltage portion 1032.
- the applied voltage V HVO_H for the high voltage portion 1012 arranged in the chip 1_101 is set to a range (applied voltage range) of V1 ⁇ V HVO_H ⁇ 2V1.
- the applied voltage V HVO_M for the intermediate voltage portion 1023 arranged in the chip 2_102 is set in a range (applied voltage range) of ⁇ V1 ⁇ V HVO_M ⁇ V1.
- the applied voltage V HVO_L for the low voltage portion 1032 arranged in the chip 3_103 is set in a range (applied voltage range) of ⁇ 2V1 ⁇ V HVO_L ⁇ ⁇ V1 .
- the differential input signal Vin is amplified by a differential input portion (differential input amplifier) 1021.
- the amplified signal is voltage-shifted by a level shift portion (level shifter circuit) 1022 to an H level side gate input and an L level side gate input.
- a final stage driver (intermediate voltage portion 1023 of the high voltage output stage) composed of transistors (P1, P2, N1, N2) and resistors (R1, R2) amplifies and outputs the voltage shifted signal.
- PMOS (P1, P2) and NMOS (N1, N2) are connected in cascade, and the gate voltage V3 of N2 and the gate voltage V1 of P2 are respectively expressed by equations (1) and (2).
- source voltages (V2 and V4) of P2 and N2 are expressed as in equations (3) and (4), where the gate-source voltage of P2 is Vgs_p and the gate-source voltage of N2 is Vgs_n, respectively. be able to.
- FIG. 3 is a diagram showing a hybrid package configuration in which three chips are realized by one case.
- FIG. 4 is a diagram showing a cross-sectional structure of a high voltage driver integrated circuit mounted on a substrate.
- chips 101, 102, and 103 are mounted on the same mounting substrate 106, and electrical signal transmission between the chips is connected by a short wire bonding 105 to minimize parasitic elements generated by wiring. Reduced and implemented. Thereby, a hybrid integrated circuit capable of high speed and high voltage output can be realized.
- a big problem with high voltage output circuits is heat dissipation.
- a high voltage output circuit that is powered at ⁇ 200 V and has a maximum output current of 150 mA consumes about 30 W and emits heat. This heat may cause the circuit to malfunction. Therefore, heat radiation design is an important issue for proper circuit operation.
- the heat from the chip basically escapes from the substrate 106 to the air via the package 104. That is, the basic heat dissipation path is substrate ⁇ package ⁇ air. However, this heat dissipation path alone is not sufficient to increase the heat efficiency. Therefore, in order to improve the heat dissipation efficiency of the package, it is common to attach a radiator (heat sink) 108 to the package 104. Many packages and radiators are basically made of metal.
- the sectional structure of the circuit will be described with reference to FIG.
- the potential on the back surface of each chip, which is the main area for heat dissipation, and the connection pattern potential of the mounting substrate 106 are the same as the sub-potential (substrate potential) of each chip.
- the separated patterns 120, 121, and 122 are placed on the surface (chip mounting surface) of the substrate 106, respectively, Place each chip.
- the substrate 106 is a multilayer substrate in order to facilitate the conduction of heat from each chip to the back surface of the substrate 106 via the patterns 120, 121 and 122.
- a chip 1 heat radiation solid layer 111 As a multilayer substrate structure, a chip 1 heat radiation solid layer 111, a chip 2 heat radiation solid layer 112, a chip 3 heat radiation solid layer 113, and a solid layer 114 which is a circuit ground layer are provided. It has been.
- sub potentials and back surface patterns also referred to as equipotential heat radiation patterns or chip potential patterns
- the potentials of the same solid layer are set to the same potential.
- the chip 1 heat radiation solid layer 111 is set to V1
- the chip 2 heat radiation solid layer 112 is set to 0 V
- the chip 3 heat radiation solid layer 113 is set to ⁇ V1.
- the chip 1 heat radiation solid layer 111 is the sub potential solid pattern layer of the chip 1
- the chip 2 heat radiation solid layer 112 is the sub potential solid pattern layer of the chip 2
- the chip 3 heat radiation solid layer 113 is the sub potential solid pattern layer of the chip 3. It can also be called a potential solid pattern layer.
- connection vias or wire bonding As many vias (also referred to as connection vias or wire bonding) 115 as possible. Further, the thermal resistance between the sub-potential pattern 121, the solid layer 112, and the back surface pattern 124 of the chip 2_102 and the thermal resistance between the sub-potential pattern 122, the solid layer 113, and the back surface pattern 125 of the chip 3_103 are reduced. For this purpose, similarly, a large number of vias (connection vias) 115 are provided. It should be noted that the vias provided for each chip are provided so as not to be electrically connected to other chips.
- the main heat radiation paths from the chip to the package are chips 101 to 103 ⁇ potential patterns 120 to 122 ⁇ back surface patterns 123 to 125.
- an insulating sheet or cream 107 is required between the back surface of the substrate 106 and the package 104.
- This insulating sheet or cream needs to satisfy at least two conditions of high withstand voltage insulating property (electrically insulating) and low thermal resistance (easy heat escape).
- FIG. 5 is a diagram showing a configuration of a high voltage driver integrated circuit according to a second embodiment of the present invention.
- the circuit configuration and heat dissipation design are basically the same as those in the first embodiment. Therefore, only the differences will be described below.
- the output Vout is a divided potential. That is, it is as shown by the equations (6) and (7).
- the maximum voltage applied to the chip 102 is ⁇ Vout.
- Vout Vsub2
- the withstand voltage condition is Vout ⁇ process withstand voltage.
- FIG. 6 is a diagram showing a configuration of a high voltage driver integrated circuit according to the third embodiment of the present invention. Since the basic configuration of the high voltage driver integrated circuit in this embodiment is substantially the same as that of the first and second embodiments, the detailed description of the overlapping portions is omitted, and here the first and second embodiments are omitted. Only different parts will be described.
- the substrate potential variable control function block 150 automatically variably controls all the chip sub potentials 151 to 155 according to the output voltage 160 of the total integrated circuit. For example, the maximum output voltage of the system is set to ⁇ 3V1, the applied voltage of the chip 141 is 3V1, and the applied voltage of the chip 145 is ⁇ 3V1.
- each chip from chip 141 to chip 143 is set.
- the applied voltage range is a range of ⁇ V1 centering on the sub-potential.
- the output voltage Vout 3V1
- the sub-potential of the chip 145 is set to ⁇ 2V1
- the sub-potential of the chip 144 is set to 0V
- the sub-potential of the chip 143 is set to 2V1
- each chip from the chip 145 to the chip 143 is set.
- the applied voltage range is ⁇ V1 centering on the sub-potential.
- a high voltage of maximum ⁇ NV1 can be output by dividing (2N ⁇ 1) chips with a breakdown voltage of ⁇ V1.
- the driver integrated circuit includes three basic functional blocks including a differential input unit, a level shift unit, and a high voltage output unit (output circuit unit) that drives a load.
- the voltage level related to the differential input unit is basically a low voltage, but the voltage related to the level shift unit and the output unit circuit is almost the maximum output voltage of the circuit.
- the level shift unit and output circuit unit are divided into three vertically connected blocks, and the voltage range applied to each is divided into the breakdown voltage range of the process. Limited to.
- the driver integrated circuit is configured using the current process, so that the cost and time required for the development of a new process can be saved, and the voltage exceeding the process breakdown voltage can be saved. It is possible to realize a driver integrated circuit with a required high breakdown voltage that can be output.
- the output circuit is also divided into three parts, which are arranged on chips 1 to 3 and vertically connected.
- a portion (1012) where V1 ⁇ applied voltage ⁇ 2V1 is arranged on chip 1 with Vsub1 V1
- ⁇ A portion (1032) of 2V1 ⁇ applied voltage ⁇ V1 is arranged on the chip 3.
- the absolute values of the voltages applied to chip 1, chip 2 and chip 3 are different, the subpotential (substrate potential) of each chip is floating (not connected to the ground), so the voltage range is There is no particular problem as long as it is within the breakdown voltage range of the chip.
- the applied voltage of the chip 2 may be set to a potential determined by the resistance voltage dividing of the output voltage. Thereby, the applied voltage (sub-potential) of the chip 2 automatically changes according to the output voltage, so that the withstand voltage condition of the chip 2 can be relaxed.
- a single package may be mounted between the three chips, and the signal transmission between the chips may be connected by short wire bonding (via). By doing so, it is possible to realize a hybrid integrated IC circuit with a high speed and a high voltage output by minimizing the parasitic elements generated by the wiring.
- the board for configuring the driver integrated circuit is a multi-layer board, and a radiator is attached to the back surface of the multi-layer board (the surface opposite to the west surface of the chip). Then, heat is transferred from each chip to the radiator through vias. By doing so, it is possible to efficiently release heat generated from each chip, which is difficult to escape even after passing through the package and can cause an illegal operation, and avoids malfunction of the circuit. be able to. It is desirable that an insulating layer made of an insulating member (insulating sheet or insulating cream) is formed between the back surface of the multilayer substrate and the radiator.
- control lines and information lines are those that are considered necessary for explanation, and not all control lines and information lines on the product are necessarily shown. All the components may be connected to each other.
- other implementations of the invention will be apparent to those skilled in the art from consideration of the specification and embodiments of the invention disclosed herein.
- Chip 1 (divided chip 1)
- Chip 2 (divided chip 2)
- chip 3 (divided chip 3)
- 1011 Level shift circuit unit 1012 arranged on chip 1
- High voltage output circuit unit 1013 arranged on chip 1
- Positive power supply 1014 of driver integrated circuit Sub potential Vsub1 of chip 1 of driver integrated circuit 1021...
- Differential input circuit section 1022 disposed on chip 2.
- Level shift circuit section 1023 on chip 2.
- High voltage output circuit section 1024 disposed on chip 2.
- Sub-potential Vsub2 of chip 2 of the driver integrated circuit 1025 Output terminal Vout of driver integrated circuit 1031: Level shift circuit unit 1032 disposed on the chip 3 High voltage output circuit unit 1033 disposed on the chip 3 Negative power source 1034 of the driver integrated circuit Chip 3 sub-potential Vsub3 of the driver integrated circuit 1311: Differential input circuit unit 1312 of driver integrated circuit ... Level shift circuit unit 1313 of driver integrated circuit ... High voltage output circuit unit 1314 of driver integrated circuit ... Positive power supply 1315 of driver integrated circuit ... Driver integrated circuit Negative power supply 1316 ... Output terminal 1317 of driver integrated circuit ... Chip sub-potential Vsub of driver integrated circuit 104 ... Hybrid package 105 ... via (connection via, wire bonding) 106 ...
- Mounting board (hybrid chip mounting board) 107 ... Insulating sheet (insulating sheet between the hybrid chip mounting substrate and the package) 108 ... Heat radiation plate 120, 121, 123 for use of hybrid IC ... Chip potential pattern 111 on mounting substrate surface ... Chip 1 heat radiation solid layer (sub potential solid pattern layer of divided chip 1) 112 ... Solid layer for chip 2 heat dissipation (sub potential solid pattern layer of divided chip 2) 113 ... Solid layer for chip 3 heat dissipation (sub potential solid pattern layer of divided chip 3) 114 ... Solid layer for circuit ground (ground potential solid pattern layer of circuit) 115... Connection via (division chip pattern on the surface of the mounting substrate, back surface pattern, solid layer connection via) 123, 124, 125 ...
- chip potential pattern on the back surface of the mounting substrate, 130 Conventional circuit chip configuration 141, 142, 143, 144, 145 ... Chip (divided chip) 150... Substrate potential variable control units 151, 152, 153, 154, 155... Sub-potential 160 of each chip... Voltage output terminals 241, 242, 243, 244, 245. 250 ... Substrate potential variable control units 251,252,253,254,255 ... Sub-potential 260 of each chip ... Voltage output terminal of integrated circuit
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Abstract
Description
<一般的なドライバ集積化回路の構成>
図1は、一般的な高電圧出力ドライバ集積化回路の構成を示す図である。高電圧出力ドライバ集積化回路130は、一般的に差動入力回路1311と、レベルシフト回路1312と、高電圧出力段回路1313と、を有している。高電圧出力端子1316の出力電圧を±2Vo、回路への最大印加電圧を±2V1とすると、V1をVoより数V~十数V高い電圧(デバイスのドロップ電圧)として設定する必要がある。
図2は、本発明の第1の実施形態による、改良された高耐圧ドライバ集積化回路の構成を示す図である。図2の回路構成を採用すれば、耐圧±V2のプロセスを使用して、最大出力電圧を±2V1(V1≒V2)とすることができるようになる。
図3及び4を参照して、高耐圧ドライバ集積化回路の実装構造について説明する。ここでは、上述した3つのチップによって分割された回路を1つ回路として動作するために必要なチップ間配線や、パッケージについて説明する。図3は、3つチップを1つのケースによって実現するハイブリッドパッケージ構成を示す図である。図4は、基板上に実装された高耐圧ドライバ集積化回路の断面構造を示す図である。
図5は、本発明の第2の実施形態による高耐圧ドライバ集積化回路の構成を示す図である。当該回路の構成や放熱の設計に関して、基本的に第1の実施形態と同様である。よって、以下では相違点のみについて説明する。
図6は、本発明の第3の実施形態による高耐圧ドライバ集積化回路の構成を示す図である。本実施形態における高耐圧ドライバ集積化回路の基本構成は、第1及び2の実施形態とほぼ同様であるため、重複する部分についての詳細説明は省略し、ここでは第1及び第2の実施形態と異なる部分についてのみ説明する。
ドライバ集積化回路は、差動入力部と、レベルシフト部と、負荷を駆動する高電圧出力部(出力回路部)の3つの基本機能ブロックから構成される。差動入力部に関する電圧レベルは、基本的に低電圧であるが、レベルシフト部と出力部回路に関する電圧は、ほぼ回路の最大出力電圧に近いレベルとなっている。レベルシフト部と出力部で使用する部品の印加電圧範囲を下げるためには、レベルシフト部と出力回路部を縦接続の3つブロックに分けて、それぞれに印加する電圧の範囲をプロセスの耐圧範囲に限定する。例えば、マージンδVを含む耐圧電圧が±V1(真のプロセス耐圧V2=V1+δV1、δV1がマージンを表す)のプロセスを使用して最大出力電圧が約±2V1のドライバ回路を作ることを考える。同一プロセスで3つのチップチップ1、チップ2、チップ3を作製し、各チップの基板電位Vsub1=V1(±変動分)、Vsub2=0(±変動分)、Vsub3=-V1(±変動分)と、それぞれ異なる電位に設定する。このようにすることにより、現状のプロセスを利用してドライバ集積化回路を構成するので、新規プロセスの開発のために必要とされるコストや時間を節約することができ、プロセス耐圧以上の電圧が出力可能な要求される高耐圧のドライバ集積化回路を実現することができる。
102…チップ2(分割チップ2)
103…チップ3(分割チップ3)
1011…チップ1に配置するレベルシフト回路部
1012…チップ1に配置する高電圧出力回路部
1013…ドライバ集積化回路の正電源
1014…ドライバ集積化回路のチップ1のサブ電位Vsub1
1021…チップ2に配置する差動入力回路部
1022…チップ2にレベルシフト回路部
1023…チップ2に配置する高電圧出力回路部
1024…ドライバ集積化回路のチップ2のサブ電位Vsub2
1025…ドライバ集積化回路の出力端子Vout
1031…チップ3に配置するレベルシフト回路部
1032…チップ3に配置する高電圧出力回路部
1033…ドライバ集積化回路の負電源
1034…ドライバ集積化回路のチップ3サブ電位Vsub3
1311…ドライバ集積化回路の差動入力回路部
1312…ドライバ集積化回路のレベルシフト回路部
1313…ドライバ集積化回路の高電圧出力回路部
1314…ドライバ集積化回路の正電源
1315…ドライバ集積化回路の負電源
1316…ドライバ集積化回路の出力端子
1317…ドライバ集積化回路のチップサブ電位Vsub
104…ハイブリッドパッケージ
105…ビア(接続ビア、ワイヤーボンディング)
106…実装基板(ハイブリッドチップ実装基板)
107…絶縁シート(ハイブリッドチップ実装基板とパッケージ間の絶縁シート)
108…ハイブリッドIC使用時用放熱板
120、121、123…実装基板表面のチップ電位パターン
111…チップ1放熱用ベタ層(分割チップ1のサブ電位ベタパターン層)
112…チップ2放熱用ベタ層(分割チップ2のサブ電位ベタパターン層)
113…チップ3放熱用ベタ層(分割チップ3のサブ電位ベタパターン層)
114…回路クランド用ベタ層(回路のグランド電位ベタパターン層)
115…接続ビア(実装基板表面の分割チップパターン、裏面パターン、及びベタ層の接続ビア)
123、124、125…実装基板裏面のチップ電位パターン、
130…従来の回路チップ構成
141、142、143,144、145…チップ(分割チップ)
150…基板電位可変制御部
151、152、153,154、155…各チップのサブ電位
160…全体集積化回路の電圧出力端子
241、242、243,244、245…チップ(分割チップ)
250…基板電位可変制御部
251、252、253,254、255…各チップのサブ電位
260…全体集積化回路の電圧出力端子
Claims (8)
- 差動入力信号を増幅する差動入力回路と、当該差動入力回路によって増幅された信号を電圧シフトするレベルシフト回路と、当該レベルシフト回路によって電圧シフトされた信号を増幅して出力する出力回路と、を有し、
前記差動入力回路と、前記レベルシフト回路と、前記出力回路とを3つ以上のチップを用いて分割して構成し、前記3つ以上のチップの基板に対して異なる電圧を印加することにより、プロセス耐圧よりも大きい出力電圧を前記出力回路から出力するように構成されたことを特徴とするドライバ集積化回路。 - 請求項1において、
前記差動入力回路と、前記レベルシフト回路と、前記出力回路とを3つのチップを用いて分割して構成する場合、第1のチップを高電圧印加チップ、第2のチップを中間電圧印加チップ、第3のチップを低電圧印加チップとし、前記プロセス耐圧をV2とすると、前記第1のチップの印加電圧をV1±δ(V1はほぼV2に等しい、δは変動要素)、前記第2のチップの印加電圧を0±δ、前記第3のチップの印加電圧を-V1±δに設定し、前記出力電圧の最大値を±2V1とすることを特徴とするドライバ集積化回路。 - 請求項2において、
前記差動入力回路は、前記第1のチップに配置され、
前記レベルシフト回路は、前記第1乃至第3のチップに分割して配置され、
前記第1のチップのレベルシフト回路部分は、前記第2のチップに含まれるレベルシフト回路部分が前記増幅された信号を電圧シフトして生成したHレベル側の信号を保持し、
前記第3のチップのレベルシフト回路部分は、前記第2のチップに含まれるレベルシフト回路部分が前記増幅された信号を電圧シフトして生成したLレベル側の信号を保持し、
前記出力回路は、前記第1乃至第3のチップに分割して配置され、
前記第1のチップの出力回路部分と前記第2のチップの出力回路部分によって前記Hレベル側の信号が増幅され、前記第2のチップの出力部分と前記第3のチップの出力回路部分によって前記Lレベル側の信号が増幅され、これら増幅された信号によって前記出力電圧が生成されることを特徴とするドライバ集積化回路。 - 請求項3において、
前記第1のチップのレベルシフト回路部分に対する印加電圧は、V1より大きく、2V1よりも小さく、前記第2のチップのレベルシフト回路部分に対する印加電圧は、-V1より大きく、V1よりも小さく、前記第3のチップのレベルシフト回路部分に対する印加電圧は、-2V1より大きく、-V1よりも小さくなるように設定され、
前記第1のチップの出力回路部分に対する印加電圧は、V1より大きく、2V1よりも小さく、前記第2のチップのレベルシフト回路部分に対する印加電圧は、-V1より大きく、V1よりも小さく、前記第3のチップのレベルシフト回路部分に対する印加電圧は、-2V1より大きく、-V1よりも小さくなるように設定されることを特徴とするドライバ集積化回路。 - 請求項1において、
複数のベタ層を有する多層基板と、当該多層基板のチップ載置面とは反対側の裏面に取り付けられた放熱器と、を有し、
前記多層基板のチップ載置面には、前記3つ以上のチップが分離して配置され、
前記複数のベタ層のうち、前記チップ数分のベタ層から前記3以上のチップのそれぞれの基板に対して基板電位が印加され、
前記多層基板の裏面には、前記基板電圧を印加するためのベタ層から前記3つ以上のチップのそれぞれへの電通を可能にする、前記チップの数に対応する複数のチップ電位パターンが形成され、
前記基板電圧が印加される前記チップ数分のベタ層のそれぞれと、前記複数のチップ電位パターンのそれぞれと、前記3つ以上のチップのそれぞれは、互いのチップが電気的に分離するように複数の接続ビアによって接続され、
前記3つ以上のチップから発せられる熱は、前記複数のチップ電位パターンを介して前記放熱器から前記ドライバ集積回路の外部に放出されることを特徴とするドライバ集積化回路。 - 請求項5において、
前記放熱器と、前記チップ電位パターン及び前記多層基板の裏面と間に、絶縁部材で構成される絶縁層が形成されていることを特徴とするドライバ集積化回路。 - 請求項1において、
前記差動入力回路と、前記レベルシフト回路と、前記出力回路とを3つのチップを用いて分割して構成する場合、第1のチップを高電圧印加チップ、第2のチップを中間電圧印加チップ、第3のチップを低電圧印加チップとし、前記プロセス耐圧をV2とすると、前記第1のチップの印加電圧をV1±δ(V1はほぼV2に等しい、δは変動要素)に設定し、前記第2のチップの印加電圧を前記出力電圧を抵抗分圧によって決定される電位に設定し、前記第3のチップの印加電圧を-V1±δに設定し、前記出力電圧の最大値を±2V1とすることを特徴とするドライバ集積化回路。 - 差動入力信号を増幅する差動入力回路と、当該差動入力回路によって増幅された信号を電圧シフトするレベルシフト回路と、当該レベルシフト回路によって電圧シフトされた信号を増幅して出力する出力回路と、基板電位制御部と、を有し、
前記差動入力回路と、前記レベルシフト回路と、前記出力回路とを5つ以上のチップを用いて分割して構成し、
前記基板電位制御部は、前記出力回路で生成される出力電圧の値に応じて変化する印加電圧であって、前記5つ以上のチップのそれぞれに対して異なる印加電圧を設定することにより、プロセス耐圧よりも大きい前記出力電圧を出力するように構成されたことを特徴とするドライバ集積化回路。
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