RF Switching Module Asymmetric Timing Control
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Solution Overview
Problem
RF signal leakage in RF switching modules decreases signal quality, damages low voltage devices, and increases power consumption, necessitating an effective and adjustable control method to mitigate these issues.
Innovation Solution
The RF switching module employs a control method with two switches and a control signal generation module to switch between modes, ensuring that switches are turned off before switching to the next mode, with predetermined timing to prevent signal leakage, using metal-oxide-semiconductor field effect transistors (MOSFETs) and resistors to manage gate voltages and prevent signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the switch is turned on to transmit RF signals, then the RF signal transmission is enabled, but RF signal leakage occurs to the receiving port
Solution Approach 1:
The patent applies preliminary action by turning off the receiving port switch before turning on the transmitting port switch. The control method includes: turning off the second switch (receiving port) before turning on the first switch (transmitting port), and maintaining the second switch in the off state for a predetermined time period after turning on the first switch. This preliminary action ensures that the RF signal transmission path is established before the receiving port becomes active, preventing RF signal leakage to the receiving port while maintaining transmission capability.
2Reliability
If the switch is turned off to prevent RF signal leakage, then RF signal quality is improved, but switching time increases
Solution Approach 1:
The patent applies partial action by implementing asymmetric switching timing where the receiving port switch remains off for a predetermined time period after the transmitting port switch is turned on, but the transmitting port switch can be turned off more quickly when switching to receiving mode. This partial action optimizes the balance between preventing RF signal leakage (keeping receiving port off longer) and reducing switching time (quickly enabling transmission when needed), achieving acceptable RF signal quality without excessive switching delays.
3Reliability
If the switch switching is delayed to prevent signal leakage, then signal quality is improved, but power consumption increases due to extended switch off periods
Solution Approach 1:
The patent applies preliminary action by turning off the receiving port switch before transmitting mode activation and maintaining it off for a predetermined time period. This controlled preliminary action prevents RF signal leakage while limiting the duration of the off state to a minimum necessary period, thereby preventing excessive power consumption. The predetermined time period is optimized to be just sufficient to prevent signal leakage without unnecessarily extending the off state that would increase power consumption.
Data Source
AI summary
A radio frequency (RF) switching module and a control method of the RF switching module are described. The RF switching module has 2 switches, and the control method includes starting to turn off a first switch of the RF switching module, starting to turn on a second switch of the RF switching module after the first switch is turned off for a first predetermined time, wherein starting to turn off the first switch and starting to turn on the second switch is finished during a transition period from a first mode to a second mode.