Reconfigurable Inductance for Switching Regulator Noise
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Solution Overview
Problem
Switching regulators in envelope tracking systems face a trade-off between noise suppression and efficiency, with larger inductors reducing efficiency while effectively suppressing noise, and existing inductors struggle to balance performance across a wide bandwidth range.
Innovation Solution
A switching regulator circuit with reconfigurable inductance, monitored by a circuit that adjusts inductance values based on switching frequency to optimize performance, allowing for larger inductance at lower frequencies and smaller inductance at higher frequencies, thereby balancing noise and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a larger inductor is used to suppress switching noise, then noise suppression is improved, but efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the inductance value adjustable rather than fixed. The switching regulator circuit includes an inductor selection circuit that can dynamically switch between multiple inductor values based on operating conditions. This allows the system to use larger inductance when noise suppression is critical and smaller inductance when efficiency is prioritized, resolving the contradiction between noise suppression and efficiency.
Solution Approach 2:
The patent changes the inductance parameter dynamically based on operating conditions. The monitor circuit detects switching frequency and other parameters, and the inductor selection circuit adjusts the inductance value accordingly. This parameter change approach allows optimization of both noise suppression and efficiency under different operating conditions, rather than being constrained by a fixed inductance value.
2Loss of energy
If a single inductor value is selected to balance noise and efficiency, then efficiency is maintained, but noise suppression deteriorates at certain frequencies
Solution Approach 1:
The system transitions from a static single inductor value to a dynamic multi-value inductor selection mechanism. The monitor circuit continuously monitors operating conditions including switching frequency, and the inductor selection circuit adjusts the inductance value in real-time. This dynamic adaptation ensures optimal noise suppression across different frequency ranges while maintaining efficiency.
Solution Approach 2:
The inductor selection circuit provides multi-functionality by supporting multiple inductance values within a single circuit architecture. Instead of requiring separate circuits for different inductance values, this universal design allows the same circuit to operate with different inductance values depending on the operating conditions, achieving both noise suppression and efficiency across a wide bandwidth range.
3Object-affected harmful factors
If inductance is increased to suppress noise, then noise suppression is improved, but device complexity increases
Solution Approach 1:
The patent segments the inductance function into multiple discrete inductor values that can be selected independently. Instead of using a single complex inductor or a continuously variable inductance mechanism, the system divides the inductance requirement into multiple fixed values (e.g., first inductor value, second inductor value) that are easier to implement and control. The inductor selection circuit switches between these segmented inductance options based on operating conditions.
Solution Approach 2:
The system introduces dynamic control through the inductor selection circuit, which automatically switches between different inductor values based on monitored operating conditions. This dynamic approach replaces what would otherwise require manual intervention or complex continuous adjustment mechanisms, achieving adaptive noise suppression with relatively simple circuitry.
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
The reconfigurable inductance circuit improves the efficiency of envelope tracking systems by dynamically adjusting inductance to match frequency changes, reducing noise impact on RF receivers and maintaining high efficiency across varying bandwidths.
Implementation Method 1
When switch 101 is closed and switch 102 is open, energy is provided to the inductor 103 from Vdd to generate an inductor current IL. Switch 102 is periodically closed and switch 101 is opened, and the inductor current IL continues to flow to an output, 'out', as energy in the inductor dissipates.
Data Source
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Figure 3A~3B
Figure 4A~4B
AI summary
The present disclosure includes switching regulator circuits and methods having reconfigurable inductance. In one embodiment, a circuit comprises a switching regulator, the switching regulator receiving a switching signal having a switching frequency, a monitor circuit to monitor the switching frequency, and a reconfigurable inductance at an output of the switching regulator, wherein the monitor circuit changes the reconfigurable inductance between a plurality of inductance values based on the switching frequency. In envelope tracking applications, an envelope tracking signal frequency and switching frequency are monitored to adjust a switching stage inductance.