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Semiconductor integrated circuit

A technology of semiconductors and constant current circuits, applied in the manufacture of semiconductor devices, circuits, and semiconductor/solid-state devices, etc., can solve the problems of different currents, voltages, wiring resistance values, and difficulty in correctly controlling the current value.

Inactive Publication Date: 2009-04-22
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, in the above-mentioned conventional structure, the distance from the constant current source differs due to the arrangement of each constant current element at the portion corresponding to the gate terminal 1 and the source terminal 2, so the resistance value of the wiring varies. difference
As a result, the current and voltage supplied from the gate terminal 1 and source terminal 2 are different for each constant current element.
In addition, since the influence of temperature caused by other components varies depending on the arrangement position of the constant current element, the current value of each channel differs due to the influence of the wiring resistance value and temperature, and it may be difficult to accurately control the current value. The problem

Method used

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Embodiment Construction

[0019] Embodiments of the present invention will be described below with reference to the accompanying drawings. figure 1 It is a configuration diagram showing the arrangement of constant current elements of the constant current circuit of this embodiment. A gate terminal 1 and a source terminal 2 which are constant current elements of an N-type MOS transistor or a P-type MOS transistor are common to all channels. The branched drain terminals are arranged in sequence from the left end and right end of the gate terminal 1 and source terminal 2 to the center in the order of the first drain terminal 6, the second drain terminal 7, and then the nth drain terminal. . In this way, in the center, the branched N-th drain terminals 8 corresponding to the N-th channel are adjacently arranged. Then, it is connected to the first output terminal channel 3, the second output terminal channel 4, and the Nth output terminal channel 5, which are output terminals of each channel.

[0020] Si...

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Abstract

The purpose of the present invention is to provide a semiconductor device capable of controlling an accurate current value. In the semiconductor integrated circuit provided with constant current circuit, the constant current circuit has plural constant current devices having common gate terminal and source terminal. Different drain terminals of the constant current device, which is disposed on one side of the gate terminal and the source terminal, are disposed on both sides of the gate terminal and the source terminal.

Description

technical field [0001] The present invention relates to a circuit configuration for uniformly controlling the current value of each channel in a constant current circuit using a plurality of constant current elements outputting a desired current ratio. Background technique [0002] FIG. 3 shows a configuration diagram showing the arrangement of N constant-current elements of a conventional constant-current circuit that outputs the same current. Conventionally, in a constant current circuit using a plurality of P-type or N-type MOS transistors as constant current elements that output a desired current ratio, as shown in FIG. 3 , the constant current elements of each channel are laid out for each element. Structure. Furthermore, the gate terminal 1 and the source terminal 2 are shared by each constant current element. In addition, the first drain terminal 6 corresponding to the first output terminal channel 3, the second drain terminal 7 corresponding to the second output te...

Claims

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Application Information

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IPC IPC(8): H01L27/00H01L21/822H01L21/82H01L27/02H01L27/04H01L27/08
CPCH01L27/0207H01L27/08
Inventor 石井敏挥
Owner SII SEMICONDUCTOR CORP
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