GaN Power Amplifier Supply Timing with Gate Voltage Holdoff
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply systems for GaN power amplifiers in base stations fail to reliably meet the strict power-on and power-off timing requirements, leading to potential short-circuit states and costly damage due to inadequate power supply timing control.
Innovation Solution
A power supply apparatus and method utilizing a redundant circuit, power-off holding circuit, gate voltage circuit, and detection and control circuit to ensure that the gate voltage is powered on before the drain voltage and powered off after, ensuring reliable power supply timing through energy redundancy and logical judgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the power supply timing control is simplified, then the device complexity is reduced, but the reliability of power supply timing is deteriorated
Solution Approach 1:
The power-off holding circuit performs preliminary action by maintaining the gate voltage in an on-state before the drain voltage is fully powered on or after the drain voltage is powered off. This advance preparation ensures that the gate voltage is already in the correct state when the drain voltage transitions, preventing short-circuit conditions and ensuring reliable timing without requiring complex real-time control mechanisms.
Solution Approach 2:
The power-off holding circuit acts as an intermediary between the power control system and the gate voltage circuit. It mediates the timing relationship by detecting the power state and automatically maintaining the gate voltage appropriately, thereby decoupling the direct control relationship and simplifying the overall control structure while improving reliability.
2Device complexity
If the power-on and power-off timing is not strictly controlled, then the device complexity is reduced, but the GaN power amplifier is easily burnt causing cost loss
Solution Approach 1:
The power-off holding circuit performs self-service by autonomously detecting the power state through its detection function and automatically adjusting the gate voltage accordingly. This self-regulating mechanism ensures the GaN power amplifier is always protected with the correct voltage timing without requiring external complex control systems, thereby reducing device complexity while maintaining high reliability.
Solution Approach 2:
The circuit provides beforehand cushioning by pre-positioning the gate voltage in the on-state before drain voltage transitions occur. This protective cushioning ensures that even if timing variations occur, the gate voltage is already in the safe state, preventing short-circuit conditions and protecting the expensive GaN power amplifier from damage.
3Device complexity
If the gate voltage is powered off earlier than drain voltage, then the power supply control is simplified, but the power amplifier operates in short-circuit state
Solution Approach 1:
The power-off holding circuit applies preliminary action by maintaining the gate voltage in the on-state before the drain voltage is powered off. This advance preparation ensures that the gate voltage remains protective during the entire drain voltage transition period, preventing the harmful short-circuit state from occurring while using simple control logic.
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
A power supply apparatus and method for a power amplifier are disclosed. The power supply apparatus includes: a redundant circuit configured to supply an input voltage to a power-off holding circuit after performing redundancy on an output voltage of a first power circuit and an output voltage of a second power circuit, and to supply an input voltage to a gate voltage circuit after performing redundancy on the output voltage of the first power circuit and an output voltage of the power-off holding circuit; a power-off holding circuit configured to provide power-off energy holding and power-off delay to a gate voltage output by the gate voltage circuit; a detection and control circuit configured to inspect the power-off holding circuit during a power-on process, to detect a voltage of the power-off holding circuit and a voltage of the gate voltage circuit during a normal operation and a power-off process, and to realize, by enable control of an enable circuit, where a detection result satisfies a judgment condition, that power-on of the gate voltage is earlier than power-on of a drain voltage and that power-off of the gate voltage is later than power-off of the drain voltage.