Digital RF Modulator Input Switching for Transient Noise Control
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Solution Overview
Problem
Digital communication systems face issues with broadband noise generation during transient events like power loss or initial power application, which can cause interference with other channels and lead to regulatory issues and customer complaints.
Innovation Solution
Incorporating a digital RF modulator with a filtered input stage and a switch that receives a zero power data signal and a transient event control signal, allowing the modulator to selectively provide the zero power data signal during transient events to limit noise generation outside the assigned channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digital RF modulator operates during transient events (power loss or initial power application), then the modulator can maintain operational continuity, but broadband noise is generated outside the assigned channel causing interference with other channels
Solution Approach 1:
The patent extracts the harmful broadband noise generation by removing the data signal input to the modulator during transient events. The switch disconnects the data signal from the modulator input when a transient condition is detected, preventing the modulator from processing data during power loss or initial power application, thereby eliminating the source of out-of-channel interference while maintaining system operational continuity
Solution Approach 2:
The patent applies preliminary action by detecting transient events (power loss or initial power application) before they cause harmful noise generation. The transient event detector identifies these conditions and preemptively controls the switch to remove the data signal from the modulator input, preventing the generation of broadband noise before it occurs
2Object-generated harmful factors
If a switch is added to control data signal input during transient events, then broadband noise is reduced, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the switch to perform multiple functions: it normally passes data signals during regular operation and automatically removes data signals during transient events. This single component handles both normal data transmission and transient event protection, reducing the need for separate dedicated components and minimizing overall circuit complexity while effectively reducing broadband noise
Data Source
AI summary
In one embodiment, a switch provides output to a digital radio frequency (RF) modulator having a filtered input stage. The switch is configured to selectively provide a zero power data signal to the RF modulator based on a transient event control signal received at the switch.