RF Matching Network Tuning Across TDD Gaps and Settling Time
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Solution Overview
Problem
Tunable components in impedance matching circuits, such as tunable capacitors, exhibit settling times that are significantly longer than the gaps between downlink and uplink transmissions in time division duplex communication systems, leading to phase and amplitude disturbances in signals, which can introduce noise and be unacceptable in communication systems.
Innovation Solution
The solution involves changing the value of tunable components in multiple stages during non-contiguous breaks in transmissions, allowing the tunable component to settle before the next transmission, thereby reducing impedance changes during active communication periods and minimizing signal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tunable components are used to achieve impedance matching, then RF performance is improved, but settling time becomes excessively long compared to transmission gaps
Solution Approach 1:
The patent segments the impedance matching adjustment process into multiple discrete steps rather than a single large adjustment. The tunable component value is changed incrementally through several intermediate values, allowing the component to settle at each step within the available transmission gap time. This segmentation enables the system to achieve the desired impedance match without requiring a settling time longer than the TDD gap.
2Reliability
If tunable component values are changed during transmission, then impedance matching can be maintained, but phase and amplitude disturbances occur in the signal
Solution Approach 1:
The patent performs impedance matching adjustments during the transmission gap period before the next active transmission begins. By completing the tunable component value changes and allowing settling to occur before transmissions resume, the system maintains proper impedance matching without introducing phase or amplitude disturbances during active signal transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces signal degradation by stabilizing tunable component values during active transmission periods, enhancing the performance of RF front-end components in communication systems by preventing phase and amplitude disturbances.
Implementation Method 1
an impedance matching circuit may be used to match an impedance of radio frequency (RF) front end components of a base station
Implementation Method 2
the tunable components may take on the order of at least 100 microseconds in terms of a settling time associated with a transition from a first/initial state/value to a commanded, second/final state/value (due to the resistive-capacitive (RC) load represented by the tunable capacitor, and the RC time constant associated therewith)
Data Source
AI summary
Aspects of the subject disclosure may include, for example, changing a tuning value of a tunable component coupled to an antenna from a first tuning value to a second tuning value during a first stage, and changing the tuning value of the tunable component from the second tuning value to a third tuning value during a second stage that occurs subsequent to the first stage, wherein during each of the first stage and the second stage the antenna is not utilized by a transmitter for communication purposes, wherein the first stage and the second stage are separated from one another by a first active region, and wherein during the first active region the transmitter causes a first signal to be transmitted from the antenna for communication purposes. Other embodiments are disclosed.