Power Amplifier Supply Switching for In-Situ Calibration Pulses
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Solution Overview
Problem
Power amplifiers in applications like satellite communications face sub-optimum performance due to drifting operating parameters over time and temperature variations, requiring calibration, which often necessitates different power requirements than normal operation, typically necessitating separate power supply components or environments.
Innovation Solution
A power supply and method utilizing the same driver circuit and switches to supply power both in normal operation and calibration, capable of periodic switching and extended voltage supply for calibration, using MOSFET switches and driver circuits with enhanced bootstrap capacitance to maintain high-side switch activation during calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power supply components are provided for calibration, then calibration can be performed with appropriate power requirements, but device complexity increases
Solution Approach 1:
The power supply circuit is designed to perform multiple functions: it can supply power during normal amplifier operation and also provide extended calibration pulses for amplifier calibration. The same switching circuitry and power supply components are used for both operational modes, eliminating the need for separate calibration power supply components.
Solution Approach 2:
The calibration power supply function is merged with the normal operation power supply function. The driver circuit and switching elements that control power during normal operation are also used to deliver calibration pulses, combining what would traditionally be separate systems into a single integrated power supply unit.
2Reliability
If the amplifier is removed to a test environment for calibration, then appropriate calibration power can be supplied, but loss of time occurs due to removal and reinstallation
Solution Approach 1:
The amplifier can be calibrated in situ within the satellite without requiring removal to an external test environment. The integrated power supply provides all necessary power functions (both operational and calibration) directly at the amplifier location, enabling self-contained calibration operations that save time and eliminate handling requirements.
3Speed
If standard bootstrap capacitance is used in high-side switches, then normal switching operation is achieved, but calibration pulse duration is insufficient
Solution Approach 1:
The bootstrap capacitance value is made dynamic rather than fixed - it can be adjusted between a smaller value for normal switching operations (faster response) and a larger value for calibration operations (longer pulse duration). This dynamic adjustment allows the system to optimize performance for different operational modes.
Solution Approach 2:
The capacitance parameter of the bootstrap capacitor is changed based on operational requirements. By varying the capacitance value, the system can extend the pulse duration during calibration mode while maintaining appropriate switching characteristics during normal operation mode.
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
Enables efficient and integrated power management for both normal operation and calibration of power amplifiers, ensuring optimal performance without the need for separate calibration environments or power supplies, by using the same driver and switching circuit for both modes.
Implementation Method 1
using MOSFET switches and driver circuits with enhanced bootstrap capacitance to maintain high-side switch activation during calibration
Data Source
AI summary
A method of operating a power amplifier supplying power to an antenna, supplying switched power to the power amplifier comprises in a first mode of operation via a driver circuit and one or more switches to switch the supply of power to the power amplifier on and off periodically; and calibrating the power amplifier in a second mode of operation. The calibrating comprises supplying voltage to the power amplifier via the same driver circuit and one or more switches for a calibration pulse duration longer than the on/off period. A power supply and an RF front end comprising the power supply are also disclosed.