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Reference current source circuit and infrared signal processing circuit

一种基准电流源、电流源的技术，应用在电子电路测试、非电信号传输系统、电路等方向，能够解决电路元件数增加等问题

Active Publication Date: 2008-07-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above structure, two switch circuits are required, and there arises a problem that the number of circuit elements increases
In addition, during normal operation, in order to maintain this state, there is a problem that the Enable signal must be constantly supplied from the outside.

Method used

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  • Reference current source circuit and infrared signal processing circuit
  • Reference current source circuit and infrared signal processing circuit
  • Reference current source circuit and infrared signal processing circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] One embodiment of the present invention will be described below based on FIGS. 1 and 2 .

[0041] FIG. 1 shows the configuration of a reference current source circuit 10 for adjusting the characteristics of a semiconductor integrated circuit by fuse trimming.

[0042] The reference current source circuit 10 includes: a current source circuit 1; a switch circuit (SW) 2; a fine-tuning fuse (hereinafter simply referred to as a fuse) 3; a "NAND" circuit 4 (control circuit); and a pull-down resistor R1 (resistance sex element).

[0043] The switch circuit 2 has a function of connecting / disconnecting the current source circuit 1 and the fuse 3, and is composed of an N-channel MOS transistor. The drain of the MOS transistor is connected to an internal circuit of a semiconductor integrated circuit (not shown) through a fuse 3 , and the source of the MOS transistor is connected to a GND terminal through a current source circuit 1 . In addition, the gate of the above-mentioned ...

Embodiment approach 2

[0053] Another embodiment of the present invention will be described below based on FIG. 2 . Note that components, signals, and the like assigned the same reference numerals as those used in Embodiment 1 above have the same functions, and descriptions are not changed. In addition, here, only the points different from the reference current source circuit 10 will be described.

[0054] FIG. 2 shows a configuration of a reference current source circuit 10a for adjusting the characteristics of a semiconductor integrated circuit by fuse trimming.

[0055] The reference current source circuit 10a differs from the reference current source circuit 10 in that a pull-down element (resistive element) 5 is included instead of the pull-down resistor R1. Pull-down element 5 is composed of an N-channel type MOS transistor. The drain of the MOS transistor is connected to one input terminal of the NAND circuit 4 , the source is connected to the GND terminal, and the gate is connected to the ...

Embodiment approach 3

[0058] Another embodiment of the present invention is described below based on FIG. 3 and Table 3. Note that components, signals, and the like assigned the same reference numerals as those used in Embodiment 1 above have the same functions, and descriptions are not changed.

[0059] FIG. 3 shows a configuration of a reference current source circuit 10b for adjusting the characteristics of a semiconductor integrated circuit by fuse trimming.

[0060] The reference current source circuit 10b has the following structure: when the current source circuit 1, the switch circuit 2, the fuse 3 and the "NAND" circuit 4 in the reference current source circuit 10 are regarded as a group (set), it includes n This group of levels. One input terminal of each NAND circuit 4 in the n-stage group is connected to each other and shared, and the control signal S1 is input thereto. The control signal S2 (S2-1 to S2-n) is input to the other input terminal of each NAND circuit 4, respectively. The...

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Abstract

The reference current source circuit (10) of the present invention comprises: a current source circuit (1); a fine-tuning fuse (3); a switch circuit (2) for connecting / disconnecting the current source circuit (1) and the fine-tuning fuse (3) The "NAND" circuit (4) of the action of the control switch circuit (2); and an input terminal of the "AND" circuit (4) is connected to the pull-down resistor (R1) of the GND terminal, and the "AND" circuit ( 4) Control the action of the switch circuit (2) by inputting the control signals (S1) and (S2), and simultaneously control the action of the switch circuit (2) based on the signal of an input terminal of the "NAND" circuit (4), so as to Connect the current source circuit (1) to the trimmer fuse (3). This realizes a reference current source circuit that can measure the characteristics of a semiconductor integrated circuit after fuse trimming, and can maintain the state after fuse trimming without external signal supply and without generating unnecessary current consumption.

Description

technical field [0001] The present invention relates to a reference current source circuit for adjusting the characteristics of a semiconductor integrated circuit by fuse trimming. Background technique [0002] Fuse trimming using a fuse trimming reference current has conventionally been performed in order to obtain desired characteristics even in the case of characteristic variations caused by semiconductor integrated circuit manufacturing variations that increase with the miniaturization of the semiconductor process. . [0003] FIG. 10 shows a reference current source circuit 105 composed of a fuse 101 and a current source circuit 102 for fuse trimming. [0004] Of course, in the reference current source circuit 105, the state of the semiconductor integrated circuit after the fuse 101 is disconnected cannot be measured before the fuse 101 is disconnected. Therefore, it is necessary to measure the characteristic variation of the semiconductor integrated circuit by another...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/28G08C23/04
CPCG08C23/04G11C17/18H01L23/5256H01L2924/0002H01L2924/00
Inventor 井上高广
Owner SHARP KK
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