Analog Signal Switch Circuit With Distortion Compensation
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Solution Overview
Problem
Existing electrical circuits for transmitting analog signals suffer from significant distortion due to the non-linear transfer curve of switches like field-effect transistors and PIN diodes, which negatively impact transmission quality.
Innovation Solution
Incorporating a compensation circuit with auxiliary switches of the same type, but smaller in size, to generate signal distortion that is in phase opposition and compensates for the distortion caused by the main switches, thereby reducing overall signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If switches (field-effect transistors or PIN diodes) are used to transfer the useful signal, then transmission loss is reduced and switching capability is improved, but signal distortion increases due to the non-linear transfer curve
Solution Approach 1:
The compensation circuit generates a distortion signal in advance that is equal in magnitude but opposite in phase to the distortion caused by the switch. This preliminary anti-action cancels out the harmful distortion before it degrades the useful signal, allowing the switch to operate in its optimal non-linear region while maintaining signal quality.
Solution Approach 2:
The invention converts the harmful non-linear distortion generated by the switch into a beneficial effect by using the same non-linear characteristic of an auxiliary switch to generate a compensating distortion signal. The harmful non-linearity is transformed into a useful tool for distortion cancellation.
2Object-generated harmful factors
If known compensation circuits are used to reduce signal distortion, then transmission quality is improved, but device complexity increases
Solution Approach 1:
The compensation circuit uses an auxiliary switch of the same type as the main switch (both field-effect transistors or both PIN diodes), ensuring homogeneous characteristics. This simplifies the circuit design compared to using different component types, and allows the compensation mechanism to rely on identical non-linear transfer curves for predictable distortion cancellation.
Solution Approach 2:
The invention creates a simplified copy of the main switch using an auxiliary switch with identical characteristics. This copy generates a distorted signal that mirrors the main switch's distortion, enabling straightforward cancellation without requiring complex compensation networks or multiple different component types.
Data Source
AI summary
The invention relates to an electrical circuit (1) for transmitting a useful analogue signal which has a signal transmission path (16) with an input path (2) and an output path (3) and one or more switches (4-6), with which switch or switches the useful signal which is carried on the input path (2) can be connected through to the output path (3) by the switch or the switches (4-6) being switched to the switched-on state. According to the invention, the electrical circuit (1) comprises a compensation circuit (7) which has one or more auxiliary switches (17) of the same type as the switch or the switches (4-6), and the auxiliary switch or switches (17) is or are coupled to the signal transmission path (16) such that said auxiliary switch or switches generates or generate signal distortion in the switched-on state, which signal distortion substantially compensates for a distortion in the useful analogue signal which is generated by the switch or switches (4-6).