Unlock instant, AI-driven research and patent intelligence for your innovation.

Electric current mirror image circuit and light signal circuit utilizing the same

A technology of current mirroring and optical signal, applied in the field of optical signal circuit

Inactive Publication Date: 2006-12-13
SHARP KK
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the current mirror parts 23, 31 must be provided, there is a problem of increasing the cost of the chip area.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Electric current mirror image circuit and light signal circuit utilizing the same
  • Electric current mirror image circuit and light signal circuit utilizing the same
  • Electric current mirror image circuit and light signal circuit utilizing the same

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0084] figure 1 is an electronic circuit diagram of the current mirror circuit 40 of the first embodiment of the present invention.

[0085] The current mirror circuit 40 includes a current mirror portion 41 composed of a pair of P-type transistors Q1 and Q2 and an adjustment transistor Q3.

[0086] The emitters of transistors Q1 and Q2 are commonly connected to a high level power supply. A signal current Iin is drawn from the collector of the input transistor Q1 via a signal source 42 .

[0087] The output transistor Q2 has its base and collector connected to each other to form a diode.

[0088] These bases and collectors are connected to the collector of the adjustment transistor Q3 while being connected to the base of the transistor Q1. The base of adjustment transistor Q3 is connected to the collector of input transistor Q1 and thus to signal source 42 .

[0089] Therefore, the output current Iout flows from the collector of the adjustment transistor Q3. The output cur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

When a current mirror circuit is composed of transistors that inevitably form a parasitic photodiode between an epitaxial layer and a substrate layer because of structure of an integrated circuit, a photocurrent increases in proportional to an area of the epitaxial layer. Thus, the area of the epitaxial layer is adjusted in accordance with a current ratio of the current mirror, so as to allow the photocurrent to affect equally on both input and output sides of the current mirror circuit, i.e., so as to cancel the photocurrent. With this, in a current mirror circuit provided in an integrated circuit, it is possible to eliminate the influence of the photocurrent, without considerably increasing an element area or taking special measures to shield light.

Description

technical field [0001] This invention relates to current mirror circuits formed within integrated circuits. More specifically, the present invention relates to an optical signal circuit composed of an integrated circuit including the current mirror circuit, an optical signal circuit provided in an electro-optical conversion element or a photoelectric conversion element close to a light emitting diode or a photodiode or the like. Background technique [0002] In integrated circuits (ICs for infrared remote control reception, ICs for optical pickup signal reception, ICs for LED driving, etc.) installed close to electro-optical conversion elements (light-emitting diodes, etc.) or photoelectric conversion elements (photodiodes, etc.), due to signal light Diffraction light or scattered light, more specifically noise light from fluorescent lamps etc., generates photocurrent in the parasitic photodiode, thereby becoming a cause of circuit misoperation. [0003] In particular, in a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01L27/06H01L27/08H01L27/00H01L27/14G05F3/26H01L21/8222H01L21/8228H01L27/082H01L27/102H01L29/06H01L29/70H01L29/732H01L29/735H01L31/0328H01L31/0352H01L31/10H01L31/11H03F3/08H03F3/343H04B10/2507H04B10/40H04B10/50H04B10/60H04B10/67
CPCH01L29/0692G05F3/265H01L29/7322H01L29/735H01L31/1105H01L31/03529
Inventor 井上高广横川成一
Owner SHARP KK