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Input protection circuit

A technology for protecting circuits and input resistances. It is applied in the layout of amplifier protection circuits, circuits, electrical components, etc., and can solve problems such as input signal deformation and input resistance damage.

Inactive Publication Date: 2004-03-24
RENESAS ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] As discussed above, a problem with conventional input protection circuits is that an input signal whose potential exceeds the positive power supply potential or whose potential becomes lower than the positive power supply potential will Input signals at positive supply potentials will distort
Furthermore, in the case of trying to solve the problem using the method disclosed in Japanese Laid-Open Patent Publication No. 2000-22077, the input resistance may be statically damaged

Method used

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no. 1 example

[0037] In the input protection circuit according to the first embodiment of the present invention, two protection diodes are respectively connected between the input terminal and the positive and negative power supplies, and the protection diode between the input terminal and the negative power supply is directly connected to the input terminal.

[0038] First, combine the Figure 5 The input protection circuit in the first embodiment is discussed. Figure 5 is a block diagram showing the input protection circuit according to the first embodiment. Such as Figure 5 As shown, the input protection circuit includes an inverting amplifier circuit 10 and protection diodes D1 and D2 as basic elements.

[0039] The inverting amplifier circuit 10 has an operational amplifier OP and resistors R1 and R2. The operational amplifier OP is a well-known operational amplifier that amplifies the potential difference applied to the inverting input terminal indicated by the symbol "-" (negative) a...

no. 2 example

[0062] In the input protection circuit according to the second embodiment of the present invention, two protection diodes are respectively connected between the input terminal and the positive and negative power supplies, and the protection diode between the input terminal and the positive power supply is directly connected to the input terminal.

[0063] First, combine the Figure 10 The input protection circuit in the second embodiment is discussed. Figure 10 is a block diagram showing an input protection circuit according to the second embodiment. Such as Figure 10 As shown, the input protection circuit in the second embodiment is similar to the first embodiment, including an inverting amplifier circuit 10 and protection diodes D1 and D2 as basic elements. Since the inverting amplifier circuit 10 is constituted in the same manner as in the first embodiment, its description will not be repeated. Likewise, the protection diodes D1 and D2 can be designed in the same manne...

no. 3 example

[0079] In the input protection circuit according to the third embodiment of the present invention, two protection diodes are respectively connected between the input terminal and the positive and negative power supplies, and the protection diode between the input terminal and the positive power supply is directly connected to the input terminal.

[0080] First, combine the Figure 14 The input protection circuit in the third embodiment is discussed. Figure 14 is a block diagram showing an input protection circuit according to the third embodiment. Such as Figure 14 As shown, the input protection circuit in the third embodiment is similar to the first embodiment, including an inverting amplifier circuit 10a and protection diodes D1 and D2 as basic elements. Since the protection diodes D1 and D2 are constituted in the same manner as in the first embodiment, description thereof will not be repeated. The protection diodes D1 and D2 can be designed in the same manner as in the...

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PUM

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Abstract

An input protection circuit includes an inverting amplifier circuit which converts the potential of an input signal input in such a way that the potential of the input signal lies in the input range of the potential range of a signal inputtable to an IC internal circuit. One protection diode is connected to a virtual ground node between an input resistor and an operational amplifier and a positive power-supply terminal to allow the input signal which has excessively exceeded the input range on the positive power-supply terminal side to flow toward the positive power-supply terminal, and another protection diode is connected to an arbitrary point between an input terminal and the input resistor and a negative power-supply terminal to allow the input current of the input signal which has excessively exceeded the input range on the negative power-supply terminal side to flow toward the input terminal from the negative power-supply terminal, thereby protecting the IC internal circuit.

Description

technical field [0001] The present invention relates to an input protection circuit for a semiconductor integrated circuit, and more particularly, to an input protection circuit for protecting a semiconductor integrated circuit from electrostatic damage. Background technique [0002] There is a known problem that when high-voltage static electricity is applied to a semiconductor integrated circuit (hereinafter referred to as "IC"), the internal circuits of the IC are statically damaged. In order to prevent such electrostatic damage on ICs, various techniques have been proposed. [0003] As a common technique for preventing electrostatic damage on an IC, in order to protect the internal circuit of the IC (hereinafter also referred to as "IC internal circuit") from static noise or the like, at the peripheral portion of the input terminal to which a signal is input , a plurality of electrostatic protection diodes are arranged in series between the two power supplies. These ES...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/04H01L21/822H01L27/02H01L27/06H03F1/52H03F3/45
CPCH01L27/0255H03F1/52H03F3/45475H01L27/04
Inventor 山口基
Owner RENESAS ELECTRONICS CORP