Signal Transmitting Circuit Impedance Matching Power Efficiency
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Solution Overview
Problem
In communication systems, particularly optical fiber communication, the characteristic impedance of transmitters matches that of loading devices, leading to reduced power efficiency as the transmitter consumes the same power as the loading device, resulting in wasted power when more power is transmitted.
Innovation Solution
A signal transmitting circuit comprising a signal generating circuit, an adjusting circuit, and a matching circuit, where the matching circuit provides a matching impedance to the loading device, and the adjusting circuit generates an adjusting voltage equal to the output voltage, preventing current flow through the matching circuit and thus minimizing its power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the characteristic impedance of the transmitter is matched with the characteristic impedance of the loading device, then the power transfer to the loading device is maximized, but the power consumption of the transmitter increases equally
Solution Approach 1:
The patent introduces a matching circuit as an intermediary component between the signal generating circuit and the loading device. This matching circuit provides a matching impedance to the loading device while the adjusting circuit applies an adjusting voltage to prevent current flow through the matching circuit, thereby enabling maximum power transfer to the loading device without the transmitter consuming equal power
Solution Approach 2:
The patent changes the voltage parameter by introducing an adjusting voltage from the adjusting circuit that is applied to the matching circuit. This voltage adjustment prevents current flow through the matching circuit while maintaining the matching impedance, thereby resolving the power consumption issue while preserving maximum power transfer
2Power
If more power is transmitted to the loading device, then the power transfer increases, but more power is wasted by the characteristic impedance of the transmitter
Solution Approach 1:
The matching circuit serves as an intermediary that isolates the transmitter from direct power consumption. By providing matching impedance through this intermediate circuit and applying adjusting voltage to prevent current flow through it, the system enables high power transmission to the loading device without proportional power waste in the transmitter impedance
Solution Approach 2:
The patent segments the power transmission path into distinct functional components: the signal generating circuit, the matching circuit with adjusting circuit, and the loading device. This segmentation allows the matching circuit to handle impedance matching separately from power generation, enabling efficient power transfer without proportional transmitter power consumption
Data Source
AI summary
A signal transmitting circuit includes: a signal generating circuit arranged to generate an output signal to a loading device according to an input signal; an adjusting circuit; and a matching circuit having a first port coupled to the adjusting circuit and a second port coupled to the signal generating circuit, wherein the second port is arranged to couple to the loading device so as to provide a matching impedance corresponding to the loading device; and the adjusting circuit is arranged to generate an adjusting signal of which a voltage applied on the first port is substantially equal to a voltage of the output signal applied on the second port.