Light Receiving Circuit Power Reduction via Transimpedance Amplifier Simplification
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Solution Overview
Problem
Conventional light receiving circuits with trans-impedance amplifiers face challenges in achieving low power consumption due to their complex circuitry configurations, which include trans-impedance amplifiers, reference voltage generating circuits, and comparators, making it difficult to reduce power consumption effectively.
Innovation Solution
The proposed light receiving circuit employs a trans-impedance amplifier and an output circuit using P-channel and N-channel MOS transistors, eliminating the need for a comparator and reference voltage generating circuit, and optimizing current flows to minimize power consumption by configuring the transistors as current mirrors and using feedback resistors to generate output signals based on optical inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional light receiving circuit is configured with a trans-impedance amplifier, reference voltage generating circuit, and comparator, then the circuit can achieve stable signal amplification and comparison, but the power consumption increases and circuit complexity increases
Solution Approach 1:
The patent extracts and removes the reference voltage generating circuit and comparator from the traditional light receiving circuit configuration. By eliminating these separate functional blocks, the circuit achieves lower power consumption while maintaining signal processing capability through a simplified trans-impedance amplifier configuration with direct output.
Solution Approach 2:
The patent merges the functions of the trans-impedance amplifier and comparator into a single integrated configuration. The output of the trans-impedance amplifier directly provides the amplified signal without requiring a separate comparison stage, thereby reducing the number of active components and overall power consumption.
2Reliability
If a traditional light receiving circuit is configured with a trans-impedance amplifier, reference voltage generating circuit, and comparator, then the circuit can achieve stable signal amplification and comparison, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the reference voltage generating circuit and comparator from the traditional light receiving circuit configuration. By eliminating these separate functional blocks, the circuit achieves lower power consumption while maintaining signal processing capability through a simplified trans-impedance amplifier configuration with direct output.
Solution Approach 2:
The patent merges the functions of the trans-impedance amplifier and comparator into a single integrated configuration. The output of the trans-impedance amplifier directly provides the amplified signal without requiring a separate comparison stage, thereby reducing the number of active components and overall power consumption.
3Use of energy by moving object
If the circuit configuration is simplified to reduce power consumption, then power consumption decreases, but signal processing capability may be compromised
Solution Approach 1:
The patent optimizes the trans-impedance amplifier parameters, including the feedback resistor value and transistor sizing, to achieve adequate signal amplification with fewer components. By carefully selecting component values and dimensions, the circuit maintains sufficient gain and signal integrity while operating with a simplified configuration that consumes less power.
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
This configuration simplifies the circuit and reduces power consumption by up to 55% when no optical signal is present and by 40% when an optical signal is input, compared to traditional designs, enabling the development of low-power electronic devices.
Implementation Method 1
The photodiode converts an optical signal into an electrical signal
Data Source
AI summary
According to one embodiment, a light receiving circuit having a trans-impedance amplifier and an output circuit is provided. The trans-impedance amplifier includes a photodiode, a feedback resistor and a first transistor having a channel of a first conductive type. The photodiode converts an optical signal into an electrical signal. Ends of the feedback resistor are connected respectively to the photodiode and a node. A gate of the first transistor receives the electrical signal from the photodiode. A signal corresponding to a signal from a drain of the first transistor is output to the node. The output circuit includes a second transistor having a channel of the first conductive type, and generates an output signal from a drain of the second transistor. A gate of the second transistor is connected to the node.