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Light receiving circuit and light coupling device

A light receiving circuit and circuit technology, applied in the direction of logic circuit connection/interface layout, electromagnetic receiver, electrical components, etc., can solve the problems of signal waveform distortion, wrong output, etc.

Active Publication Date: 2016-03-02
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in an optical receiving circuit that includes a light-receiving element and a TIA (TransImpedance Amplifier, transimpedance amplifier) ​​in the input section, if the gain setting of the TIA is performed when receiving a weak-level optical signal, when the signal strength is strong , the TIA will be saturated and the output signal waveform will be distorted
Thus, since an erroneous output is generated in the output signal, the signal strength must be suppressed

Method used

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  • Light receiving circuit and light coupling device
  • Light receiving circuit and light coupling device
  • Light receiving circuit and light coupling device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] figure 1 It is a circuit diagram illustrating an example of a light receiving circuit according to this embodiment.

[0024] Such as figure 1 As shown, the light receiving circuit 10 of this embodiment includes a light receiving element 1 (PD), an inverting amplifier circuit 2 (Ai), a feedback circuit 3 , a limiting circuit 4 and a current mirror circuit 5 . The light receiving circuit 10 is connected between a reference potential 20 and a power supply potential 25 . The reference potential 20 is the lowest potential among the potentials to which the light receiving circuit 10 is connected, and is typically a ground potential of 0V. The power supply potential 25 is the highest potential among the potentials to which the light receiving circuit 10 is connected, and is, for example, 3.3V. The reference potential 20 and the power supply potential 25 need only maintain the above-mentioned potential relationship, and both or one of the reference potential 20 and the power...

no. 2 approach

[0047] figure 2 It is a circuit diagram illustrating an example of a light receiving circuit according to the second embodiment.

[0048] image 3 It is a circuit diagram illustrating the operation of the light receiving circuit according to the comparative example of the second embodiment.

[0049] Such as figure 2 As shown, in the light receiving circuit 40 of this embodiment, the inverting amplifier circuit 2a includes a MOSFET-based source-grounded amplifier circuit, and the current mirror circuit 5 includes a MOSFET-based current mirror circuit 5a, which is different from that of the first embodiment. The light receiving circuit 10 of the method is different. Hereinafter, the same reference numerals are assigned to the same circuit elements and connections as those of the light receiving circuit 10 of the first embodiment, and detailed descriptions will be omitted.

[0050] The inverting amplifier circuit 2a includes an inverting amplifier transistor 42 (M1) and a l...

no. 3 approach

[0061] Figure 4 It is a block diagram illustrating an optical receiving circuit according to the third embodiment.

[0062] Figure 5It is a block diagram illustrating a light receiving circuit according to a comparative example of the third embodiment.

[0063] Figure 6 (a) is an operation waveform diagram illustrating the operation of the light receiving circuit of the third embodiment. Figure 6 (b) is an operation waveform diagram illustrating the operation of the light receiving circuit of the comparative example.

[0064] Such as Figure 4 As shown, the light receiving circuit 60 of this embodiment has a comparator 61 whose non-inverting input terminal is connected to the output node 23 and a reference power supply circuit 62 connected to the inverting input terminal of the comparator 61, which is different from that of the first embodiment. The light receiving circuit 10 of the method is different. Hereinafter, the same reference numerals are assigned to the sam...

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PUM

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Abstract

The invention provides a light receiving circuit which is difficult to generate error output and stably performs movement and a light coupling device. The light receiving circuit includes a first light receiving element for outputting first current signals, an inverting amplification circuit with an input terminal connected with the first light receiving element and an output terminal for outputting voltage sgianls based on the first current signals, a first resistance element and a second resistance element connected between the input terminal and the output terminal in series, a thirf resistace and a capacitor connected between a connecting point and a reference potential between the first resistance element and the second resistance elment in series, and a charging circuit charging the capacitor by employing the current outputted based on the first current signals.

Description

[0001] References to related applications [0002] This application is based on and claims priority from Japanese Patent Application No. 2014-173090 filed on August 27, 2014, the entire contents of which are hereby incorporated by reference. technical field [0003] The embodiments described here generally relate to light receiving circuits and light coupling devices. Background technique [0004] In recent years, in devices that use light to transmit signals, such as optical coupling elements and optical data links, performance such as luminous efficiency of light-emitting elements has improved, and the transmission loss level of plastic optical fibers forming optical transmission paths has also improved. Therefore, by using these devices, low-cost and large-capacity optical data communication can be performed. In such an optical data communication environment, it is desired to expand the dynamic range of an optical receiving circuit and maintain stable operation over a wi...

Claims

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Application Information

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IPC IPC(8): H04B10/60H03K19/0175
CPCH03F3/082H03F2200/78H04B10/6931H04B10/00
Inventor 铃永浩佐仓成之
Owner KK TOSHIBA