Normally Closed Analog Switch for No-Power Signal Pass-Through
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrical switches often distort signals or require dedicated power to operate properly, which limits their efficiency in routing signals without altering them.
Innovation Solution
A switching device configured with first, second, and third transistors, where the source of the first transistor is coupled to the drain of the second transistor and the gate of the third transistor, allowing signal pass-through without applied power, using a depletion mode negative-swing switch to conduct signals above or below ground without clipping or cross-over distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional electrical switches are used to route signals, then signal routing functionality is achieved, but signal distortion occurs and dedicated power is required
Solution Approach 1:
The patent inverts the traditional switch operation by using a normally-closed configuration where the switch is conductive by default and requires a control signal only to open. This depletion-mode approach eliminates the need for continuous power to maintain the conductive state, allowing signal pass-through without power while maintaining signal integrity through the direct transistor connection
2Reliability
If dedicated power is provided to electrical switches for proper operation, then reliable switching function is achieved, but power consumption increases
Solution Approach 1:
The switching device serves itself by using the signal being switched to control the switching action. The control signal is derived from the signal path itself rather than requiring an external power supply, allowing the device to operate without dedicated power while maintaining reliable switching functionality through the signal's own voltage variations
3Productivity
If traditional switches are used to conduct signals, then signal routing is achieved, but signal distortion and clipping occur
Solution Approach 1:
The patent extracts the power requirement from the signal path by using a depletion-mode transistor configuration that conducts signals without needing external power. This separation allows the signal to pass through the transistor directly from drain to source without being subjected to voltage drops or distortion that would occur in traditionally powered switching circuits
Data Source
AI summary
This document discusses, among other things, a switching device and method configured to receive a signal at a signal input, to provide the signal at an output in a first state without an applied voltage at a first control input, and to isolate the signal from the output in a second state with an applied voltage at the first control input. In an example, the switching device can include first, second, and third transistors, wherein the source of the first transistor is coupled to the drain of the second transistor and to the gate of the third transistor, wherein the signal input is coupled to the drain of the first transistor and to the drain of the third transistor, and wherein the output is coupled to the source of the third transistor.