Optical Receiver Startup Control Against Noise Light
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Solution Overview
Problem
Conventional optical receiver circuits face issues with power consumption due to the risk of premature shutdown state release caused by noise light, leading to increased power usage.
Innovation Solution
An optical receiver circuit design that includes an amplifying part, a capacitor, start-up controlling means, judging means, and resetting means to differentiate between signal and noise light, preventing unnecessary startup and shutdown of the amplifying part, thereby reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a shutdown function is provided to reduce power consumption, then power consumption is reduced, but the shutdown state may be prematurely released by noise light causing increased power consumption
Solution Approach 1:
The patent introduces a noise light detection circuit as an intermediary between the photodiode and the shutdown control circuit. This intermediary detects whether incoming light is noise or a valid transmission signal and provides this information to the shutdown control circuit, enabling it to make informed decisions about maintaining or releasing the shutdown state, thereby preventing premature release due to noise light
Solution Approach 2:
The patent implements a feedback mechanism where the noise light detection circuit continuously monitors the light input and provides feedback to the shutdown control circuit. When noise light is detected, the feedback signal maintains the shutdown state; when a valid transmission signal is detected, the feedback signal allows the shutdown state to be released, creating a closed-loop control system that responds appropriately to different light conditions
2Ease of operation
If the shutdown state is released based on output from the amplifier, then the system returns to normal operation, but noise light causes false startup leading to increased power consumption
Solution Approach 1:
The noise light detection circuit serves as an intermediary that filters out noise light signals before they can trigger false startup. It distinguishes between valid transmission signals and noise, allowing the system to startup only when appropriate, thereby preventing unnecessary power consumption while maintaining automatic operation
Solution Approach 2:
The patent converts the harmful effect of noise light into a beneficial filtering mechanism. By using the noise light detection circuit to identify and block noise signals, the system transforms what would be a source of false startup into a protective feature that enhances power efficiency while preserving automatic startup capability for valid signals
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The circuit effectively reduces power consumption by inhibiting startup and immediately cutting off power to the amplifying part when noise light is detected, ensuring continuous operation only with valid signal input, thus outperforming conventional apparatuses in power efficiency.
Implementation Method 1
an optical signal input to the photodiode is amplified by the amplifying part
Data Source
AI summary
In the case in which an input voltage to a comparator COMP reaches (½)×Vcc from initial Vcc in accordance with lowering of the electric potential at a nodal point N1, an output level of the comparator COMP is inverted to make the output level LOW. In the case in which the output level of the comparator COMP is made LOW, a switch for amplifying part SW3 is connected, and an optical receiver circuit 1 makes the shift to a half start-up state. A signal detector circuit SD as well is started up by the connection of the switch for amplifying part SW3. In the case in which an amplifying part 2 is started up, the signal detector circuit SD judges whether a transmission signal is included in an output from the amplifying part 2. In the case in which the signal detector circuit SD shows that a transmission signal is not included, the resetting switch SW2 is connected to reset a capacitor C1.