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Optical receiver

A technology of optical receivers and optical receiving components, applied in electromagnetic receivers, electromagnetic transceivers, transmission systems, etc., can solve the problems of increasing chip area and increasing the number of parts, so as to prevent the increase of parasitic capacitance, reduce the flow current, and suppress The effect of the increase in output pulse amplitude distortion

Inactive Publication Date: 2005-11-02
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] But when Figure 7 In this configuration, even when no light signal is incident, the amplifier circuits AMP1 and COPM1 for detecting light need to be operated, so the current flows even during standby
[0009] In addition, there is also such a disadvantage that since the photodiode for detecting optical signals needs to be used for other purposes, the number of parts will increase, thereby increasing the chip size in the case of using an OPIC (optical IC). area

Method used

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  • Optical receiver
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] figure 1 It is a block diagram showing the optical receiver 1 of this embodiment. The light receiving element 11 converts an optical signal transmitted from the outside through an optical fiber cable or the like into an electric current signal. The current signal of the light receiving element passes through the low frequency and high frequency current separating filter circuit (filter circuit) 12, and is separated into a low frequency current component approximated to a DC component of the current signal and a high frequency current component including a data sequence.

[0046] The low-frequency current component is input to the comparator 14 through the current-voltage conversion circuit 13 for current-voltage conversion, and then input to the bias circuit 15 .

[0047] use figure 2 The current component of the light receiving element will be described in more detail. figure 2 The current waveform of the light-receiving element is the waveform when a bi-phase sy...

Embodiment 2

[0054] As shown in FIG. 3, the modulated optical signal is converted into a current signal by the light receiving element PD1. When the optical receiver is on standby, the gate voltage of the N-channel MOSFET (MN1) becomes a high level, and since MN1 is turned on, one electrode of the capacitor C1 is grounded to the GND level. The low frequency component of the current flowing in the light receiving element flows through the resistor R1 and the high frequency component flows through the capacitor C1 through the filter circuit composed of the resistor R1 and the capacitor C1 connected to the ground through the MN1. Specifically, the current flowing through resistor R1

[0055] fc=1 / {2π·(R1+Vt / IDC_PD)·C1}

[0056] (in,

[0057] Vt: k·T / q

[0058] k: Boltzmann constant

[0059] T: absolute temperature

[0060] q: elementary charge

[0061] IDC_PD: A DC current component flowing through the light receiving element PD1) becomes a current signal passing through a low-pass filt...

Embodiment 3

[0072] Such as Figure 4 As shown, on the structure of Fig. 3, the low-frequency current flowing in the light receiving element PD1 is amplified by the current mirror composed of PNP transistors QP1 and QP4, and the voltage is converted by the resistor R mon, so that it is output to the Monitor (MON ITOR) terminal. Thereby, the intensity of the light signal incident on the light receiving element PD1 can be monitored. In addition, the receiver can enter the operation mode only when the optical signal incident on the light-receiving element is within a certain range due to the combination of the window comparator through the multi-segment current mirror.

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PUM

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Abstract

An optical receiver of the present invention has a filter circuit for separating low / high frequency current in order to separate a low frequency current component and a high frequency current component from a current signal generated by a light receiving device, a current / voltage converter circuit for converting low frequency current into voltage, and a bias circuit for activating a signal processing circuit according to output of the current / voltage converter circuit. Accordingly, it is possible to make current consumption of the optical receiver substantially 0 (close to leak current of a device) when there is no light signal. This makes it possible to realize an optical receiver that is so effective in lowering the power consumption that it does not need a shut-down signal from outside in order to attain lower power consumption. This achieves the optical receiver in which current running during a waiting mode is reduced.

Description

technical field [0001] The present invention relates to optical receivers for converting optical signals into electrical signals. Background technique [0002] As optical receivers for converting optical signals into electrical signals, especially optical fiber links widely used in general households for music, input and output optical digital receivers are used in CD, MD, DVD players, amplifiers, etc. Optical transceiver equipment used in fiber optic links for signals. In recent years, since the use of transmitting music signals in portable devices such as notebook computers, mobile phones, and MP3 players has become popular, low power consumption is also required in devices using optical fiber links in order to achieve longer battery life . [0003] Moreover, the optical fiber is light in weight and has good anti-noise performance. Vehicle-oriented optical fiber links such as MOST (Mddia Oriented Systems Transport) and IDB1394 are in the practical stage and require low p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/40H02H3/00H04B10/50H04B10/524H04B10/556H04B10/58H04B10/60
CPCH04B10/66
Inventor 清水隆行
Owner SHARP KK