Power Amplifier Control Circuit for T/R Supply Swing Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In transmit/receive switching systems like TDD, the power amplifier experiences non-linear operation due to power supply voltage swings during mode switching, leading to undesired signal modulation, and existing solutions like turning on the PA ahead of time can result in data corruption.
Innovation Solution
A circuitry with a load circuit and a first switch is used to reduce the power supply voltage swing by switching on ahead of the PA activation, with the first switch coupling the voltage to ground and the PA being turned on after the swing has stabilized, using a control circuit to manage these timings based on the system configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the power amplifier is turned on in advance to ensure linear operation during transmission, then the signal quality is improved, but the reception may be corrupted due to residual voltage swings
Solution Approach 1:
The load circuit is activated in advance before the power amplifier turns on, preparing the power supply voltage to be stable before transmission begins. This preliminary action prevents voltage swings during PA activation while maintaining reception integrity by ensuring the load is already in place.
Solution Approach 2:
The load circuit is activated beforehand to counteract the potential voltage swings that would occur when the power amplifier turns on. By having the load circuit ready in advance, the system preemptively prevents the harmful voltage variations before they can affect reception or signal quality.
2Speed
If the power amplifier is turned on immediately when transmission is initiated, then the response time is reduced, but the power supply voltage swing causes non-linear operation and signal modulation
Solution Approach 1:
The load circuit is activated in advance to prepare the power supply environment before the power amplifier needs to operate. This ensures that when the PA turns on immediately for transmission, the voltage is already stable, enabling both fast response and linear operation.
Solution Approach 2:
The load circuit acts as an intermediary between the power supply and the power amplifier. By introducing this intermediate element that is activated first, the system mediates the voltage swing issue, allowing the PA to respond quickly without suffering from non-linear operation.
3Manufacturing precision
If a guard period is provided before transmission to turn on the power amplifier in advance, then linear operation is ensured, but the reception may be corrupted and transmission time is reduced
Solution Approach 1:
Instead of providing a guard period where the PA is turned on in advance, the load circuit is activated in advance to prepare the power supply. This eliminates the need for reception corruption risks while maintaining linear operation, thereby maximizing transmission time and productivity.
Solution Approach 2:
The invention converts the harmful effect of voltage swings into a benefit by using the load circuit to absorb and stabilize the voltage variations. This transforms what would normally be a problematic period into a useful preparation phase that enables immediate transmission without guard periods.
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 enhances the linear performance of the power amplifier, reducing the impact of voltage swings on the signal, thereby preventing data corruption and ensuring stable transmission.
Implementation Method 1
a load circuit for at least partly reducing a magnitude of a swing of a power supply voltage caused by a variation in load of the transmit/receive switching system
Data Source
AI summary
According to embodiments of the present disclosure, circuitry (400, 600) and method (800) are provided for controlling a power amplifier (10) in a transmit/receive switching system. The circuitry (400, 600) comprises a load circuit (420, 620) for at least partly reducing a magnitude of a swing of a power supply voltage caused by a variation in load of the transmit/receive switching system that occurs upon initiation of a transmission by the transmit/receive switching system. The circuitry (400, 600) further comprises a first switch (410, 610), coupled in series with the load circuit (420, 620), operable to switch on to couple the power supply voltage to a ground voltage via the load circuit (420, 620). The circuitry (400, 600) further comprises a control circuit (430, 630) configured to switch on the first switch (410, 610) at a first timing, and to switch off the first switch (410, 610) and turn on the power amplifier (10) at a second timing. The first timing is a time interval ahead of the second timing.